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Finite-elements modeling of radiant heat transfers between mobile surfaces; Modelisation par elements finis de transferts radiatifs entre surfaces mobiles

Abstract

In the numerical modeling of thermal industrial problems, radiant heat transfers remain difficult to take into account and require important computer memory and long computing time. These difficulties are enhanced when radiant heat transfers are coupled with finite-elements diffusive heat transfers because finite-elements architecture is complex and requires a lot of memory. In the case of radiant heat transfers along mobile boundaries, the methods must be optimized. The model described in this paper concerns the radiant heat transfers between diffuse grey surfaces. These transfers are coupled with conduction transfers in the limits of the diffusive opaque domain. 2-D and 3-D geometries are analyzed and two configurations of mobile boundaries are considered. In the first configuration, the boundary follows the deformation of the mesh, while in the second, the boundary moves along the fixed mesh. Matter displacement is taken into account in the term of transport of the energy equation, and an appropriate variation of the thermophysical properties of the transition elements between the opaque and transparent media is used. After a description of the introduction of radiative limit conditions in a finite-elements thermal model, the original methods used to optimize calculation time are explained. Two examples of application illustrate the  More>>
Authors:
Daurelle, J V; Cadene, V; Occelli, R [1] 
  1. Universite de Provence, 13 - Marseille (France)
Publication Date:
Dec 31, 1996
Product Type:
Conference
Report Number:
ETDE-FR-99703312; CONF-9602163-
Reference Number:
SCA: 420400; 990200; PA: FRC-98:004825; EDB-99:046712; SN: 98002014921
Resource Relation:
Conference: Workshop on calculation codes for radiant heat transfers, Journee d`etudes sur les codes de calcul de rayonnement thermique, France (France), 14 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Calculation codes for radiant heat transfers; PB: 158 p.; Les codes de calcul de rayonnement thermique
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; RADIANT HEAT TRANSFER; FINITE ELEMENT METHOD; COMPUTERIZED SIMULATION; MESH GENERATION; SURFACES; OPTIMIZATION; FUEL RODS; ELECTRIC MOTORS; INTERFACES
OSTI ID:
333939
Research Organizations:
Societe Francaise des Thermiciens, 75 - Paris (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE99703312; TRN: FR9804825
Availability:
OSTI as DE99703312
Submitting Site:
FR
Size:
pp. 31-48
Announcement Date:

Citation Formats

Daurelle, J V, Cadene, V, and Occelli, R. Finite-elements modeling of radiant heat transfers between mobile surfaces; Modelisation par elements finis de transferts radiatifs entre surfaces mobiles. France: N. p., 1996. Web.
Daurelle, J V, Cadene, V, & Occelli, R. Finite-elements modeling of radiant heat transfers between mobile surfaces; Modelisation par elements finis de transferts radiatifs entre surfaces mobiles. France.
Daurelle, J V, Cadene, V, and Occelli, R. 1996. "Finite-elements modeling of radiant heat transfers between mobile surfaces; Modelisation par elements finis de transferts radiatifs entre surfaces mobiles." France.
@misc{etde_333939,
title = {Finite-elements modeling of radiant heat transfers between mobile surfaces; Modelisation par elements finis de transferts radiatifs entre surfaces mobiles}
author = {Daurelle, J V, Cadene, V, and Occelli, R}
abstractNote = {In the numerical modeling of thermal industrial problems, radiant heat transfers remain difficult to take into account and require important computer memory and long computing time. These difficulties are enhanced when radiant heat transfers are coupled with finite-elements diffusive heat transfers because finite-elements architecture is complex and requires a lot of memory. In the case of radiant heat transfers along mobile boundaries, the methods must be optimized. The model described in this paper concerns the radiant heat transfers between diffuse grey surfaces. These transfers are coupled with conduction transfers in the limits of the diffusive opaque domain. 2-D and 3-D geometries are analyzed and two configurations of mobile boundaries are considered. In the first configuration, the boundary follows the deformation of the mesh, while in the second, the boundary moves along the fixed mesh. Matter displacement is taken into account in the term of transport of the energy equation, and an appropriate variation of the thermophysical properties of the transition elements between the opaque and transparent media is used. After a description of the introduction of radiative limit conditions in a finite-elements thermal model, the original methods used to optimize calculation time are explained. Two examples of application illustrate the approach used. The first concerns the modeling of radiant heat transfers between fuel rods during a reactor cooling accident, and the second concerns the study of heat transfers inside the air-gap of an electric motor. The method of identification of the mobile surface on the fixed mesh is described. (J.S.) 12 refs.}
place = {France}
year = {1996}
month = {Dec}
}