Chemical and Biomolecular Engineering Research and Publications


Date of this Version



This paper was originally published in the Journal of "Energy ", Vo1.21, No.2, pp. 99- 103, February 1996 © of this paper belong to Elsevier. The relevant information about this patent can be obtained from the website. Journal of Energy.


Modified expressions for the heat-transfer fluxes at the interface of a solid surface and a gas are given for different Knudsen-number regimes. These expressions for diatomic gases contain both a gas-reflection and a thermal accommodation coefficient. Parallel-plate, coaxial-cylindrical and concentric spherical surfaces are considered. A general expression for the thermal accommodation coefficient is based on experimental data. Sample numerical calculations of heat flux in different heat-transfer regimes are presented in terms of the reciprocal Knudsen number.