Thermal force on a disk in rarefied gas

摘要

A theory for thermal force on a finite disk is developed by revising an earlier theory for an infinitely large plate. Coupling between force and temperature gradient is provided as before by constitutive equations relating momentum and heat flux to the second derivative of temperature. Viscosity and thermal conductivity coefficients depend on Knudsen number so as to span the transition regime. The theory includes surface accommodation effects and is in satisfactory agreement with recent experimental data.