Some of the factors affecting the rate of loss of water from a drying system are shortly reviewed. These factors fall into two groups: (1) the drying system itself, and (2) the environmental conditions. The Second group may include (a) diffusion of water vapour through the air, (b) bulk air movements due to (i) tempe-rature gardients between different parts of the drying vessel, (ii) temperature lowering of the drying mass itself due to evapora-tion, (iii) lower density of moist air, (iv) inevitable disturbance introduced by experimental conditions such as weighing or move-ment of apparatus (v) the geometry of the system. It is shown that of the external factors the most important are (2-a), (2-b) (i) and (2-b) (ii); (2-b) (iv) may produce irregularities in the rate curves of air-dry granular materials; (2-b) (iii) and (2-b) (v) appear to have little or no effect.
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Madras Agricultural Students Union
Tamil Nadu Agricultural University
Coimbatore - 641
003
Tamil Nadu, India.
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