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Characteristic pressure; effective mean free path; molecular collisions; pore diameter

Considering the htermal conduction through molecular collisions an expression for the effective thermal conductivityλ_e of loose and granular two-phase materials at different interstitial air pressure has been derived. The dependence ofλ_e on pore and particle sizes, characteristic pressure and radiative heat transfer is also discussed. Calculated values ofλ_e of glass beads and loose building materials are compared with reported results.

R N Pande^{1 2} D R Chaudhary¹

1. Department of Physics, University of Rajasthan, Jaipur - 302 004, India
2. Government College, Dholpur, Rajasthan, India

Published

May 1985

Manuscript received

18 July 1984

Manuscript revised

28 December 1984