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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

STUDY OF SIMULTANEOUS CONDUCTIVE AND RADIATIVE HEAT TRANSFER IN HIGH POROSITY MATERIALS

Get access (open in a dialog) DOI: 10.1615/IHTC7.4050
pages 505-510

Sinopsis

Heat transfer by simultaneous conduction and radiation in an absorbing, emitting and anisotrop-ically-scattering high porosity porous material is investigated theoretically and experimentally. Consideration is given to a one-dimensional system enclosed between two parallel gray, diffuse and isothermal surfaces. Two kinds of porous materials are used as a specimen. The temperature distributions, the Nusselt numbers and the effective thermal conductivities are obtained experimentally. An analytical model to predict heat transfer performance is developed based on the assumption that the porous material between two surfaces is to be a homogeneous and continuous medium for radiation and conduction, and then analysis is performed under the conditions which corresponds to the experiment. The radiative properties of the specimen required for the theoretical analysis are determined spectroscopically based on an analytical method developed by the present authors, which utilize the Henyey-Greenstein phase function. Agreements between the analytical results and experimental results are satisfactory.