On the kinetics of heat and mass transfer at gas-liquid and gas-solid boundaries

Starting from a general formulation of the scattering law for the gas-surface interaction of a monoatomic gas during evaporation at the boundary layer, the phenomenologic coefficients for mass and heat transfer are defined. Characteristic parameters are the evaporation and condensation coefficients for mass transport and the thermal accommodation coefficient for energy transport. Near equilibrium mass and heat flow density depend linearly on pressure and temperature increases at the boundary layer. For the phase transition at high vacuum and high density the Onsager coefficients are derived from the scattering law.