Abstract
This chapter discusses the equations of mass and heat transfer, and conditions of single-valuedness. Heat and mass transfer is described by a system of differential equations obtained from the laws of conservation of mass and energy transfer. When combined with the equations of state, the system of differential equations of heat and mass transfer is a closed system of equations. To solve such a system, conditions of uniqueness are necessary. In majority of cases, it is not possible to obtain a solution of the system of differential equations for heat and mass transfer. The system of equations can be solved strictly analytically only in some particular cases The differential equations of mass and energy transfer are derived by the methods of thermodynamics of irreversible processes. Moreover, the interaction of the body surface with the surrounding medium in relation to mass transfer can be described by four kinds of boundary conditions.
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