Studies on Through Flow Drying : II. Simultaneous Heat and Mass Transfer in the Decreasing Drying Rate Period

Abstract

Part II of this paper reports an investigation of the mechanism of the decreasing drying rate period for through flow drying. The moisture distribution in the packed bed during the decreasing rate period was obtained by measuring the moisture content of particles at arbitrary drying times. A theoretical discussion on simultaneous heat and mass transfer in the decreasing drying rate period is presented and basic rate equations are derived from theoretical considerations under several assumptions. The authors solved numerically the simultaneous equations by digital computer. The calculated results generally agreed with the experimental date of moisture distribution.