Catalogue en ligne

Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Heat transfer applications of two-phase flow : new concepts
Type de document :	texte imprimé
Auteurs :	F.J. Collado, Auteur
Importance :	p 3-10
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR
Résumé :	A new mass equation for two-phase reacting flow is presented. The new equation represents a global treatment of both phases being the representative velocity of the mixtures the continuous phase velocity. Based on this new proposal, a new energy balance for a one-dimensional, two-phase flow with mass exchange at steady state has been derived. The new expressions are tested against experimental boiling water data. A strong dependence between the void fraction and a modified expression of the quality of the steam-water flow has been found.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Numerical simulation of solidification process of molten polymer flowing in a two-dimensional flat channel
Type de document :	texte imprimé
Importance :	p 11-18
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	SIMULATION NUMERIQUE PROCESSUS DE SOLIDIFICATION POLYMERE MOLTEN
Résumé :	Solidification process of molten polymer was stimulating using a numerical simulation program developed by considering non-Newtopian flow and crystallization simultaneously. In our crystallization model, the effects of non-isothermal and stress-induced crystallization kinetics were taken into account . The simulation method was applied to the solidification process of molten polypropylene, a crystalline plastic, flowing in a two-dimensional flat channel with cooled walls. Various cooling wall temperatures and polymer mass velocities were investigated numerically.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Experience of modelling of turbulent forced convection in ducts
Type de document :	texte imprimé
Auteurs :	M. Rokni, Auteur
Importance :	p 19-26
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Résumé :	The need for a reliable and reasonable accurate turbulence model without convergence problem for calculating duct flows for industrial applications has become important . In this study, three different turbulence models for predicting the turbulent Reynolds stresses namely ; standard k-£ model, the non-linear k-£ model of Speziale and a full Reynolds Stress Model (RSM) are compared with each other. The advantages, disadvantages and accuracy of these models are discussed. The turbulent heat fluxes are modeled by the SED concept, the GGDH and the WET methods. The advantages of GGDH and WET compared to SED are discussed and the limitations of these models are clarified.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Elliptic predictions of heated turbulent jets using advanced turbulence closures
Type de document :	texte imprimé
Auteurs :	M. El Hayek, Auteur ; J. Henriette, Auteur
Importance :	p 27-34
Langues :	Français (fre)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Résumé :	The present investigation deals with the application of advanced Reynolds stress closures to the calculation of non-isothermal jet phenomena. A new scalar second order model based on scalar turbulent scales is proposed. Instead of the classical analogy concept between the mechanical and the scalar transport mechanisms, a new scalar time scale, defined as the ratio of the temperature variance and its rate of dissipation or scalar dissipation or scalar dissipation, is used to close the system. This new model is compared with both the standard RSM model and an advanced cubic version. Comparison with experimental data is also performed and shows some promising features.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	The predictions of RNG-Based turbulence models in complex flows under low Reynolds number conditions
Type de document :	texte imprimé
Auteurs :	Feng Mei, Auteur ; Michel El Hayeck, Auteur ; Hector Meunier, Auteur
Importance :	p 35-42
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Résumé :	This paper discusses the performance of two RNG-based turbulence models in predicting combustion flows with relaminarized turbulence and predominate radiation heat transfer. The study finds the two models of good performance over the standard k-£ model , noting that they require much less computational effort than some more complicated non-linear models. The present study finds also that the standard RNG turbulence model is better than the differential RNG model in predicting relaminarized turbulent combustion flows in the Single Ended Radiant tube.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Mathematical modelling of the selected thermal phenomena occurring the sintering process of iron ores.
Type de document :	texte imprimé
Auteurs :	T. Kruczek, Auteur
Importance :	p 43-50
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Résumé :	The model takes account of such thermal phenomena occurring in the sintering process as : moisture transfer, heat exchange and coke breeze combustion. In general, the model is designed for testing the influence of various factors on energy characteristics of the sintering process. The model has been verified on the basis of laboratory test results. Calculations and laboratory test results have been presented with the use of ceramic instead of sinter-mix. Both calculations and test results overlap.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Simulation of a gas-solid reaction system foraparticle under non-isothermal conditions
Type de document :	texte imprimé
Auteurs :	B. Peters, Auteur
Importance :	p 51-58
Langues :	Français (fre)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	SYSTEME DE REACTION GAS-SOLIDE PARTICULE NON ISOTHERMAL
Résumé :	The objective of this paper is to present a numerical simulation method for the gasification of particulate material. The method operates on the one-dimensional , transient differential equation for spherical particles with heat and mass transfer at the particle surface. Thus, this method covers a large range of combustion modes, exceeding the the validity of the shrinking and reacting core models. Furthermore, an additionnal novelty of the approach is to include conservation laws for morphological parameters such as inner surface and porosity.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Analysis of coal gasification in hydrogen swirl flame by means of mathematical modelling
Type de document :	texte imprimé
Auteurs :	S. Nemoda, Auteur ; M. Sijercic, Auteur ; N. Crnomarkovic, Auteur
Année de publication :	1998
Importance :	p 59-66
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Résumé :	A mathematical and numerical model of two-phase turbulent swirl flow with momentum, mass and heat transfer between the injected coal particles and the hydrogen flame in an axi-symmetric reactor is presented. The mathematical model of the process entails the solution of a set of mutually coupled conservation equations for the gas phase and the for particles, as well as a number of auxiliary relations which describe various phenomena and interactions encountered in the process. The paper presents plots of profiles of species concentrations and mixture velocity and temperatures at various locations along the reactor.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Stability of double-diffusive convection in a rectangular cavity with constant heat and mass fluxes along the vertical side-walls
Type de document :	texte imprimé
Auteurs :	K. Ghorayeb, Auteur ; A. Mojtabi, Auteur
Importance :	p 67-74
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Résumé :	This paper is devoted to the onset of double-diffusive in a vertical rectangular cavity. The horizontal side-walls are impermeable and adiabatic while the vertical ones are subjected to constant heat and mass fluxes. In this study, we assume that the ratio N of solutal to thermal Grashof numbers is equal to -1. We perform , by the means of the Galerkin method, the linear stability analysis of the purely diffusive solution. The onset of convection is also numerically studied using a spectral method. It is found that, in a square bounded cavity, the purely diffusive solution becomes unstable for Rat/Le-1/=19726 for constant fluxes boundary conditions (Newman boundary conditions) while it is shown to be Rat/Le-1/=17174 for Dirichlet vertical boundary conditions. Direct numerical simulations confirm the over-mentioned results and point out the existence of a subscribal regime for a Rayleigh number which is six times smaller than the critical Rayleigh number
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Identification of macroscopic thermophysical properties during transient heat transfer processes : two-equation model and application to a stratified medium
Type de document :	texte imprimé
Auteurs :	C. Gobbé, Auteur ; J.L. Battaglia, Auteur ; M. Quintard, Auteur
Importance :	p 75-82
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Résumé :	An inverse procedure is proposed to identify the macroscopic thermophysical properties of a two-phase heterogeneous during transient heat conduction processes. Macroscopic modelling is established using a volume averaging technique . In case of local thermal non-equilibrium, this leads to a two-equation model in which macroscopic properties are defined by six effective independent parameters. An identification procedure based on the Levenberg-Marquardt algorithm is proposed to identify the macroscopic properties in the case of stratified media.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Optimal experiment design for distributed parameter estimation
Type de document :	texte imprimé
Auteurs :	N. Point, Auteur ; A. Vande Wouwer, Auteur ; S. Porteman, Auteur
Importance :	p 83-90
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Résumé :	Parameter estimation in distributed parameter systems is usually accomplished by minimizing an output least suare criterion, which is defined through the solution of the model equations. The criterion gradient, which is the basic information required by the optimization algorithm, as well as the sensitivity functions are computed using direct differentiation. A procedure for determining optimal experimental conditions based on a « measure of independence » of the sensitivity functions, e.g. the Gram determinant is developed. This method is illustrated with two examples describing the optimal selection of input signals and sensor locations.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Computation of parameter sensitivities in non-linear dynamic systems
Type de document :	texte imprimé
Auteurs :	Paul Stangerup, Auteur ; Nadia Rahni, Auteur
Importance :	p 91-98
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	SYSTEME DYNAMIQUE NON LINEAIRE PARAMETRE DE LA SENSITIVITE
Résumé :	This paper describes the implementation of sensitivity calculations in the general-purpose stimulation program ESACAP. It is shown how exact derivatives of a steady state or time domain solution with respect to any describing parameter in a non-linear dynamic system can be obtained at very little additional computational effort . The method is applicable to any numerical integration scheme. In this work, backward differentiation with variable step and order is considered.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Application of exact differential screening analysis to dynamic building energy simulation models
Type de document :	texte imprimé
Auteurs :	N. Rahni, Auteur
Importance :	p 99-106
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	MODELE DE SIMULATION D'ENERGIE ANALYSE DE PROCESSUS DE CONFORMITE
Résumé :	In order to select the most influential parameters of a building thermal model involving 390 parameters, an exact differential screening analysis is performed. After one single run of the model, only 23 parameters are retained. For the analysed configuration, results show that : (1) prominent parameter effects are found to be strongly influenced by the exchanged heat flows ; (2) depending on the nature of the materials and their thermal properties (thermal resistivity, storage capabilities…) thermophysical parameter effects have characteristic time evolutions ; (3) the influential parameters ( with respect to the inner air temperature) are all related to the building components hanving the largest heat exchange with the air cell. In addition, exact differential analysis has demonstrated its efficiency in predicting model output uncertainty band.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	About the Fréchet derivative operator in functional inverse heat conduction problems
Type de document :	texte imprimé
Auteurs :	C. Martinsons, Auteur ; M. Heuret, Auteur
Importance :	p 107-114
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	CONDUCTION DE CHALEUR OPERATEUR DERIVATIF DE FRECHET
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Reduced-order models coupled by non-linearities-application to building modelling
Type de document :	texte imprimé
Auteurs :	C. Menezo, Auteur ; J.J. Roux, Auteur ; J. Virgone, Auteur
Importance :	p 115-124
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	MODELISATION D'APPLICATION MODELISATION DE LA NON-LINEARITE TRANSFERT DE CHALEUR
Résumé :	In the thermal realm like in many fields, model conceiving faces an increasing comlexity of systems (satellites, electric engines, electronic circuits and cards, buildings,….)As a consequence, it has to match with the development of reduced-order models of some subsystems irrespective of the control aims. The purpose of the present work is to compare the scale model behaviour to detailed models coupled by non-linear or linear heat transfers laws. The reduction technique used here consists in linear and invariant system truncation in the eigenmodes space according to energetic criteria. It has been applied in several ways for reduction of large dynamical systems.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	The use of reduced models to solve inverse heat transfer problems
Type de document :	texte imprimé
Auteurs :	E. Videcoq, Auteur ; D. Petit, Auteur ; H. Sadat, Auteur
Importance :	p 125-132
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR MODELISATION REDUITE
Résumé :	In the case of a large system, the numerical modelling of the transient diffusion equation leads to a vector differnetial equation of large size. In order to treat Inverse Heat Conduction Problems (IHCP), such as the identification of thermal stimulations from measured temperatures, the use of this type of model is very difficult . Here, we propose an original way for IHCP, by using a Reduced Model (RM) which retains in a simple and stable way, the relations between the thermal inputs and outputs that are observed. This RM, built with dominant eigenmodes, acts as a filter in high frequencies and leads to a precise and well-conditioned algorithm when future time steps are added.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Thermal modelling of an electrical motor : identification of heat generations through a reduced model
Type de document :	texte imprimé
Auteurs :	S. Thieblin, Auteur ; Y. Bertin, Auteur ; D. Petit, Auteur
Importance :	p 133-140
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	MODELISATION THERMALE MOTEUR ELECTRIQUE MODELISATION REDUITE GENERATION DE CHALEUR
Résumé :	New applications of the electrical motor, such as vehicle traction, generate strong thermal constraints and so firstly need accurate studies on their new dynamic thermal behaviour as well as an efficient control of sensitive organs. We show here how the Eitelberg reduction technique applied to a detailed nodal model can provide answers in this context. Afterwards, the reduced model is used to solve an original inverse problem consisting in finding again several, widely distributed heat generations through temperature measurements.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Generation and application of closed-form solutions for 1D transient heat conduction problems in multi-layered bodies
Type de document :	texte imprimé
Auteurs :	W. Heidemann, Auteur ; E. Hahne, Auteur
Importance :	p 143-150
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	CONDUCTEUR DE CHALEUR
Résumé :	A computer-based solution algorithm for the calculation of temperature field equations is suggested. Therefore temperature field equations, suitable for direct practical application can be generated with minimal effort in terms of work and time.The solution procedure is applied to the computation of approximate closed-form solutions for heat conduction problems in plane single and multi-layered walls with linear,time dependent boundary conditions. An imperfect thermal contact between body layers is considered. Thermal excitation functions both of a time discrete and time continuous form are treated. The accuracy of the solutions is investigated by comparing the results obtained for two examples with numerical solutions.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Thermal multilayer with recursive method
Type de document :	texte imprimé
Auteurs :	N. Trannoy, Auteur ; Ph. Grossel, Auteur
Importance :	p159-166
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	METHODE RECURSIVE TRANSFERT DE CHALEUR
Résumé :	This note presents a possibility to resolve the heat diffusion equation with non-constant thermal coefficients and with source in the multilayer. The thermal response is analyzed from generalized reflection coefficients of thermal waves. These coefficients are evaluated at each interface. The set of expressions provides a recursive approach. This modelling is used to study the thermal behaviour of a near-field probe whose influence of the sample surface is treated by introducing a thermal coupling coefficient.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Thermomechanical modelling by harmonic response functions
Type de document :	texte imprimé
Auteurs :	Y. Gillet, Auteur ; S. Offermann, Auteur
Langues :	Français (fre)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	MODELISATION THERMOMECANIQUE TRANSFERT DE CHALEUR
Résumé :	Integral methods yield convenient tools to deal with inhomogeneous problems. In a similar way to the Green’s fucntions in time-dependent problems, the harmonic response functions are more well suited to calculate the temperature or displacement distributions induced by harmonic source fields of any spatial distribution. The present paper describes two aspects of thermomechanical couplings. The first application deals with scanning electron accoustic microscopy. The second one consists in thermoelastic stress analysis by means of radiometry.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Hybrid numerical-analytical solution of three-dimensional Luikov problem
Type de document :	texte imprimé
Auteurs :	J.B.F. Duarte, Auteur ; J.W. Ribeiro, Auteur
Importance :	p 167-174
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	PROBLEME DIMENSIONEL SOLUTION NUMERIQUE-ANALYTIQUE THEORIE DE LUIKOV
Résumé :	Multidimensional drying in capillary porous media is analytically solved for the associated dimensionless temperature and moisture content distributions. For application purposes, a Luikov model with linear transport coefficients and three-dimensional plate geometry is adopted for description of the simultaneous heat and mass transfer phenomena. The generalised integral transform technique (GITT) is used in the automatically global error-controlled solution of the coupled partial differential equations. The behaviour of the dimensionless temperature and moisture distribution is illustrated.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Robust and efficient solution of the inverse heat conduction problem using observers
Type de document :	texte imprimé
Auteurs :	J. Blum, Auteur ; W. Marquardt, Auteur
Année de publication :	1998
Importance :	p 175-182
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	PROBLEME DE CONDUCTION TRANSFERT DE CHALEUR
Résumé :	Observers are proposed as a solution algorithm for the inverse heat conduction problems (IHCP) of reconstructing a time-dependent surface heat flux at the boundary of a linear heat conductor. Solving the IHCP is viewed as a filter design problem in which the reconstructed heat flux is obtained by lowpass-filtering of the true heat flux. It is demonstrated that observers yield a better tradeoff between the deterministic bias and the sensitivity to measurement errors and lead to smaller-size computational problems than other solution approaches.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Affordable domain optimization methods for a Stefan’s model of phase change systems
Type de document :	texte imprimé
Auteurs :	R. Aboulaich, Auteur ; I. Hagouch, Auteur ; A. Souissi, Auteur
Année de publication :	1998
Importance :	p 183-190
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR SYSTEME DE CHANGEMENT DE PHASE METHODE D'OPTIMISATION
Résumé :	This work considers a free-boundary problem : a two-phase Stefan’s problem, usually introduced as a model for solidification or melting situations. An equivalent formulation involving the characteristic function of an unknown domain is introduced. The semidiscretization in time of the new formulation leads to an optimization problem involving the sign of an unknown function and suggests a numerical method based on the determination of the unknown domain by optimization methods. Numerical experiments show that this method is effective to calculate.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	A phase diagram for compartment fire
Type de document :	texte imprimé
Auteurs :	E. Cafaro, Auteur ; L. Ranaboldo, Auteur
Année de publication :	1998
Importance :	p 191-198
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	MODELISATION THERMODYNAMIQUE MODELE ENERGETIQUE ANALYSE MATHEMATIQUE
Résumé :	The thermal balance equation-derived for a compartment fire event by a zone model is reduced to gradient-type dynamic system. The study of the stable solutions of the obtained equation allows to determine a phase diagram of the analysed fire event.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Temperature field in bodies with self irradiating cavities ; BEM solution
Type de document :	texte imprimé
Auteurs :	R. Bialecki, Auteur ; L. Grela, Auteur
Année de publication :	1998
Importance :	p 199-206
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR BOUNDARY ELEMENT METHOD (BEM)
Résumé :	The paper deals with a situation when portions of the boundary of a heat conducting solid mutually irradiate themselves and exchanging heat by convection. Steady state problems are considered and heat conduction in multilayered media in the presence of temperature dependent heat conductivities is dealt with . Boundary elements are used in the conductive and radiative portion of the analysis. Coupled equations sets resulting from conduction and radiation are solved using an original solution strategy.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Formulation of boundary element method for calculation of heat accumulated in homogenous body
Type de document :	texte imprimé
Auteurs :	B. Obsieger, Auteur
Année de publication :	1998
Importance :	p 207-214
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR BOUNDARY ELEMENT METHOD (BEM) CONDUCTION DE CHALEUR EQUATION DIFFERENTIELLE
Résumé :	The evaluated method allows calculation of accumulated heat in homogenous isotropic body without calculation of temperature field in the body, by simple integration of boundary conditions. Unknown boundary conditions are related to predetermined boundary conditions by integral equation of equilibrium, which can be reduced to the ordinary system of linear equations by dividing boundary into boundary elements. A few additional expressions for calculation of temperature field are also presented.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Numerical simulation of time-periodic convective flows in an infinite horizontal porous layer
Type de document :	texte imprimé
Auteurs :	F. Dufour, Auteur ; M.C. Neel, Auteur
Année de publication :	1998
Importance :	p 215-222
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR SIMULATION NUMERIQUE LONGUEUR D'ONDE FILTRATION DE RAYLEIGH
Résumé :	A previous mathematical study has shown that two kinds of two-dimensional convective patterns solve the Darcy law and the heat equation in an infinite horizontal porous layer, heated from below, where a non zero through-flow is imposed. They are travelling waves and front-like modulated rolls, with wavelengths in an interval. A numerical study which is the topic of this paper allows to describe the corresponding flows above the convective threshold.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Instantaneous and time averaged 3D flow and temperature structure in 2D ribbed channels
Type de document :	texte imprimé
Auteurs :	U. Muller, Auteur ; M. Fiebig, Auteur
Année de publication :	1998
Importance :	p 223-230
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR NOMBRE DE REYNOLDS
Résumé :	Flow and temperature fields have been computed in a two-dimensional rectangular channel with a ribbed wall by solving numerically three dimensional nonsteady Navier Stokes and energy equations. Reynolds number, the lateral boundary conditions and the width of the channel have been varied. Results indicate that both instantaneous and time averaged three dimensional structures appear irrespective of the lateral boundary conditions (symmetry or periodicity).
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Coupled radiation and convection modelling in complex geometries with reflecting walls
Type de document :	texte imprimé
Auteurs :	M.P.M.A. Limpens, Auteur ; C.C.M. Rindt, Auteur ; A.A. van Steenhoven, Auteur
Année de publication :	1998
Importance :	p 231-238
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR REFLEXION DE CHALEUR RADIATION ARMATURE D'ECLAIRAGE
Résumé :	In this paper, a radiation model coupled with free convection is presented. The radiation model is based on the discrete ordinate method for gray media. The momentum, energy and discrete ordinate equations are solved with the finite element method. The need for an upwind scheme in complex geometries and the implementation of specular and diffuse reflecting walls in the radiation model are discussed. The model is applied to the combined heat transfer problem in a lighting armature.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Radiative-convective heat transfer in a reacting bow shock layer
Type de document :	texte imprimé
Auteurs :	R. Vaillon, Auteur ; M. Lallemand, Auteur ; D. Lemonnier, Auteur
Année de publication :	1998
Importance :	p 239-246
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR COUCHE LIMITE HYPERSONIQUE TRANSFERT RADIATIF
Résumé :	A study of the combined radiative –convective heat transfer at the stagnation point region of a chemically reacting stand off the hypersonic shock layer developing in the front of an axisymmetric blunt body is performed. Total radiative local sources and fluxes functions are accurately determined by using a special frequency integration method associated to an up to date absorption spectrum and the Discrete Ordinates Method on Orthogonal Curvilinear Coordinates (DOM-OCC) accounting for the curvature of the body. As a result for an hydrogen-helium atmosphere, the net relative fluxes profile upon a black surface of a body and the radiative sources field within the layer are worked out.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	New algorithm for the discrete ordinates method : application to anisotropic scattering media of irregular geometry
Type de document :	texte imprimé
Auteurs :	M. Sakami, Auteur ; A. Charette, Auteur
Année de publication :	1998
Importance :	p 247-255
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	METHODE ALGORITHMIQUE DISCRETE ORDINATES METHOD (DOM)
Résumé :	In this paper, the effect of Mie anisotropic scattering on radiative heat transfer is studied using a new algorithm based on the discrete ordinates method. A gray absorbing, emitting and anisotropically scattering medium is enclosed in cavities of regular and complex geometry. The phase function is approximated by a finite series of Legendre polynomials. The key feature of the new technique is the utilization of general characteristic equations which replace the classical spatial differencing schemes and makes possible the use of triangular grids which can be fitted to any geometrical enclosure. An assessment of the method is given by comparing the results with those obtained by other authors . The method proves to be general and accurate.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Computation of radiative heat transfer in 2-D domains by the discrete transfer method on unstructured meshes
Type de document :	texte imprimé
Auteurs :	V. Feldheim, Auteur ; P. Lybaert, Auteur
Année de publication :	1998
Importance :	p 257-265
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR DISCRETE TRANSFER METHOD (DTM)
Résumé :	This paper presents the application of the discrete transfer method (DTM) of Shah and Lockwood to solve 2-D radiative heat transfer on an unstructured triangular mesh which allows applications to arbitrary geometries. The method is validated on two standard test cases, by comparison of the results with values obtained by the original DTM and the discrete ordinates method.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Summary test results for some adaptive grid methods in one space dimension
Type de document :	texte imprimé
Auteurs :	A. Wande Wouwer, Auteur ; P. Saucez, Auteur ; W.E. Schiesser, Auteur
Année de publication :	1998
Importance :	p 267-274
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	ADAPTATIVE GRID CODE TRANSFERT DE CHALEUR MOVING FINITE ELEMENT METHOD (MFE)
Résumé :	In this paper, we consider four adaptive grid codes based on the method of lines. The performance of the several codes is illustrated with the numerical solution of three test-problems, e.g. a model of a single-step reaction with diffusion. Burgers’ equation and a model of flame propagation . From a practical point of view, we examine the issues of accuracy, temporal performance, ease of use and simplicity of implementation.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Alternative treatment of strong source terms in non-linear hyperbolic conservation laws. Application to unsteady 1-D compressible flow in pipes with variable cross section
Type de document :	texte imprimé
Auteurs :	J.M. Corberan, Auteur ; L.L. Gascon, Auteur
Année de publication :	1998
Importance :	p 275-282
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	METHODE LAX&WENDROFF TRANSFERT DE CHALEUR EQUATION D'EULER
Résumé :	In this paper, a second order explicit finite difference scheme has been defined to solve a class of non-homogenous conservation laws, which includes the one-dimensional Euler equations with source terms arising from variation of area along a narrow duct. The basic idea has been the transformation of the system of conservation laws with source terms in a homogenous system. The proposed scheme recognizes stationary solutions of the non-homogenous system. Numerical results are presented to demonstrate the performance of the described scheme.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	The use of a combined discrete-continuous modelling language for the simulation of an adsorption heat pump
Type de document :	texte imprimé
Auteurs :	A.M.W. Wojcik, Auteur
Année de publication :	1998
Importance :	p 283-290
Langues :	Anglais (eng)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR POMPE D'ABSORPTION DE CHALEUR
Résumé :	This paper describes an adsorption heat pump on the level of the visual structure of the components ; adsorber/generator, condenser, evaporator, three valves, two heaters and two coolers. A decomposition into subsystems and processes is given and discussed. The « Prosim modelling language », a combined discrete-continuous modelling language, is used for implementation in order to handle the aspects of state events, variable number of differential equations , varying the order of the differential equations due to changing causality during the simulation and automated switching between the numerous possible model structures. Numerical simulation results are given in order to show the discontinuous dynamically behaviour.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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Accompagne Advanced concepts and techniques in thermal modelling / J. Henriette

Titre :	Solidification modelling using data parallel programming
Type de document :	texte imprimé
Auteurs :	I. Masters, Auteur ; R.W. Lewis, Auteur
Année de publication :	1998
Importance :	p 291-298
Langues :	Français (fre)
Catégories :	MATHEMATIQUE-PHYSIQUE-CHIMIE
Mots-clés :	TRANSFERT DE CHALEUR MODELE DE SOLIDIFICATION MODELISATION DE DONNEES
Résumé :	This paper considers the data parallel model and its application to the conjuguate gradient routine as the matrix solver in heat transfer problems . The parallel conjuguate gradient routine is implemented and efficiency results are obtained. It is then compared with a sequential direct solver and conclusions are drawn concerning the performance and ease of use of the method.
Numéro du document :	A 7482/PHY
Niveau Bibliographique :	2
Bull1 (Theme principale) :	PHYSIQUE
Bull2 (Theme secondaire) :	THERMIQUE

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