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The influence of the gas-surface interaction law on the classical problems ofviscous drag and thermophoresis on a spherical particle with high thermalconductivity immersed in a monatomic rarefied gas is investigated on the basisof the solution of a kinetic model to the linearized Boltzmann equation. Thescattering kernel proposed by Cercignani and Lampis is employed to model thegas-surface interaction law via the setting of two accommodation coefficients,namely the tangential momentum accommodation coefficient (TMAC) and the normalenergy accommodation coefficient (NEAC). The viscous drag and thermophoreticforces acting on the sphere are calculated in a wide range of the rarefactionparameter, which is defined as the ratio of the sphere radius to an equivalentfree path of gaseous particles, so that the free molecular, transition andcontinuum regimes of the gas flow are covered.

Drag and thermophoresis on a sphere in a rarefied gas based on the Cercignani-Lampis model of gas-surface interaction