The rate at which drying is accomplished is
governed by the rate at which these two processes
proceed. In convective drying, heat transfer will occur
through flow of heat. Mass transfer in the drying of
solid will depend on two mechanisms: movement of
moisture internally within the solid which will be a
function of the internal physical nature of the solid
and its moisture content; and the movement of water
vapour from the material surface as a result of
external conditions of temperature, air humidity and