ABSTRACT
This chapter looks at private stationary and non-stationary solutions of the equations of interphase mass transfer for various boundary conditions in a fluid at rest or at various Peclet numbers. At low Peclet numbers, diffusion mass transfer is mainly observed, as a result of which, the general equations of mass transfer are substantially simplified. The chapter describes various analytical solutions of stationary mass-transfer equations are proposed with allowance for chemical reactions and the mass flux per unit surface, which is an important parameter for calculating the transport coefficients. The equations of non-stationary mass transfer by diffusion describe many mass-transfer processes and are suitable for studying the rate of mass transfer at low flow velocities and convective transport for small Peclet and Reynolds numbers. The chapter considers general and particular solutions of the mass-transfer equation for surfaces with different geometries under different boundary and initial conditions.
