  The influence of the gas-surface interaction law on the classical problems of
viscous drag and thermophoresis on a spherical particle with high thermal
conductivity immersed in a monatomic rarefied gas is investigated on the basis
of the solution of a kinetic model to the linearized Boltzmann equation. The
scattering kernel proposed by Cercignani and Lampis is employed to model the
gas-surface interaction law via the setting of two accommodation coefficients,
namely the tangential momentum accommodation coefficient (TMAC) and the normal
energy accommodation coefficient (NEAC). The viscous drag and thermophoretic
forces acting on the sphere are calculated in a wide range of the rarefaction
parameter, which is defined as the ratio of the sphere radius to an equivalent
free path of gaseous particles, so that the free molecular, transition and
continuum regimes of the gas flow are covered.
