Models for Mass Transfer Processes

Abstract

In this chapter we discuss mathematical models for processes of precipitation and coprecipitation of ions. From the viewpoint of differential equations these models are boundary-value problems for systems of quasilinear parabolic equations. In some cases considered in this chapter the system consists of two equations: a quasilinear (or linear) parabolic equation and an ordinary (or algebraic) nonlinear equation. For example, the processes described by these models can be used to extract, concentrate and separate radionuclides. Not only qualitative, but also quantitative estimates of parameters of these processes are of great practical and scientific importance. In particular, it is necessary to study the laws of precipitation and coprecipitation of radionuclides in order to be able to predict how they spread in ecological chains, which is important for environment protection and public health services.