Adsorption of Water Vapour by Polished Rice under Vacuum Conditions.
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概要
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Driving force for moisture transfer can be conceptually increased by maintaining head space at very high or very low vapour pressures. Under subatmospheric pressures the sorption resistance due to interstitial air within a kernel of grain is low. Using this concept, the adsorption and desorption properties for polished rice, which can be used in commercial moisture adjusters to get even sorption in a batch, have been measured under reduced pressure for theoretical interpretation of the process. Higher uniformity of sorption was found at lower vacuum levels in thick layer sorption. Sorption coefficient "k", in the first falling rate period moisture transfer equation, was calculated for one-seed layer at different temperature and vacuum levels. Grain damage due to low pressure was also investigated.
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