Mathematical modelling of heat and mass transfer in three phase fluidized bed systems

Abstract

For absorption and desorption processes, spray columns and packed beds are used in industries. However, they have drawbacks such as low heat and mass transfer rates, large carryover, etc. Fluidized bed systems are found to be efficient and the above problems do not exist. In the present work a mathematical model has been developed to predict the heat and mass transfer in three phase fluidized bed systems, which can be applied for dehumidification of air, cooling of water, gas purification, etc. A finite difference scheme with Crank-Nicholson method has been used to solve the equations. The effect of liquid flow rate and the gas flow rate on Nusselt Number and Sherwood Number are predicted. The variation of residence time is also studied. The results of the localised particle model are extended to the bed model and the overall performance characteristics are also predicted.