ABSTRACT
The drying environment varies both spatially and temporally, and causes non-uniform boundary conditions. This chapter discusses the additional concepts that are important in developing conjugate modelling. Computational fluid dynamics (CFD) is a modelling approach that has been applied widely in different unit operation modelling. Among several advantages of incorporation of CFD in drying model, the quantification of spatial and temporal heat and mass transfer coefficients and observation of the effect of drying conditions are the main ones. Many of the food processors are involved in simultaneous HMT and fluid flow. Along with energy conservation (heat transfer), mass conservation (mass transfer), and ideal gas law, governing equations about fluid flow need to be considered in the conjugate model. In addition to the boundary conditions of heat and mass transfer, separate boundary conditions for fluid flow need to be incorporated in the model.
