Spectral and refractive effects in non-stationary radiative transfer: a theoretical study in dense media |
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Authors: | S Fumeron P Ben-Abdallah |
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Institution: | a Département des Sciences Appliquées, Groupe de Recherche en Ingénierie des Procédés et Systèmes, Université du Québec à Chicoutimi, P4-3240, CURAL, Chicoutimi, 555 Boulevard de l’Université, Chicoutimi, Québec, Canada G7H 2B1 b Laboratoire de Thermocinétique, UMR CNRS 6607, Ecole Polytechnique, Site de la Chantrerie, 44 306 Nantes cedex, France |
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Abstract: | A theoretical study of unsteady radiative heat transfer inside refractive heterogeneous participating media is presented. In the approximation of space-time geometrical optics, some new properties for propagating waves are exhibited. Physically, it is shown that the time dependency of refractive index can give rise to an effect of spectral bounce, whereas space dependency is responsible for the existence of confined trajectories for light. Then, the problem of energy transport is studied: from the shape of Clausius Invariant in unsteady processes, the transient radiative transfer equation is built and the existence of amplification effects for specific intensity is presented. |
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Keywords: | Transient radiative transfer Refractive media Confined trajectories Clausius invariant Local overheating Refractive index Space dependency Time dependency |
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