Microwave heating of flowing slurry

Abstract

Mathematical models are constructed to investigate the use of microwaves to dissolve chemical crystals in a flowing solvent. The slurry is considered to be a Newtonian fluid in which the solvent is heated by microwaves. The solute crystals dissolve at a rate which depends strongly on temperature, and the dissolution has a profound effect on the viscosity of the slurry. Special consideration is given to crystal size and heating effects close to the walls containing the slurry.

A simplified version of the mathematical model is solved numerically, and the results lead to suggestions for improved design of the process. We also investigate the implications of non-Newtonian fluid models. The overall outcome of the work is a better understanding of the heat and mass transfer of the slurry, as well as recommendations on crystal size and design of the process.