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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

FINITE ELEMENT MODELING OF RADIATION HEAT TRANSFER COUPLED WITH CONDUCTION WITH SURFACE BOUNDARY EVOLUTION

Get access (open in a dialog) DOI: 10.1615/IHTC10.3870
pages 337-342

Résumé

This study deals with the finite element modeling of radiation coupled with diffusion heat transfer with boundary surface evolution. In many engineering problems, radiation occurs at the field boundary where transfer is purely conductive. Traditional resolutions of such problems use lumped radiosity method by delimiting the field into isothermal surfaces. This isothermal assumption implies the use of very refined meshes. Furthermore, if radiative surfaces move it requires a lot of form factor calculation.
An alternative simple method suppresses this isothermal restriction by directly integrating the Fredholm integral form. This method is more accurate. The form factor calculation is implicitly implemented in the evaluation of the radiative flux on each element. It enables the large reduction of the mesh.
In this work, we present a hybrid method which uses both approaches, lumped radiosity and direct integration. We use this formulation to model heat transfer between nuclear fuel rods during an accident.