Abstract
A theoretical analysis of mass transfer under a reduced pressure, especially the transition regime was made on the basis of the gas kinetic theory. Maxwell moment method utilizing the two-sided Maxwellian distribution function proposed by Lees et al. was applied to the mass transfer between two concentric spheres, and the accomodation coefficient was taken into account. The analytical solution with the evaluated accomodation coefficient O.9 agreed well with the experimental results of sublimation of naphthalene performed by the authors.
