ABSTRACT
This chapter discusses the expressing of heat and mass transfer equations for different drying systems. Heat transfer equations generally represent the thermal energy balance of the sample or drying system. The chapter also discusses the relevant considerations when governing the different drying systems. Drum drying is effective for the drying of pureed materials and other high-viscous liquid materials. In the drum drying process, the drying of viscous liquid materials is applied as a thin layer onto the outer surface of drums that are continuously heated internally. There are some drying systems which need assistance from other drying systems continuously. After discussing the governing equation and boundary condition, the chapter focuses on the properties of the common materials related to heat and mass transfer. It is devoted to a brief review of the main properties required in developing heat and mass transfer modelling.
