Effect of moisture content on size, surface area and volume of grains.
1988
Kim M.S. | Park J.M.
An accurate measurement of size, surface area and volume of agricultural products is essential in many engineering operations such as bandling and sorting, and in heat transfer studies on heating and cooling processes. Little information is available on these properties for such products due to their irregular shape and moreover very little information on the rough rice and the barley has been published. In comparison of the surface area and volume of the 0.0375m diameter-sphere measured in this study with the calculated values by the formula, the percent error between them showed least values of 0.65% and 0.77% at the rotational degree interval of 15 degree respectively. The physical dimensions were found to vary linearly with moisture content and the ratios of length to thickness (L/T) and of width to thickness (W/T) decreased with moisture content. Over the experimental moisture levels, the surface area and the volume were in the ranges of 60-68 x 10** (-6)m** (2), 36-44x10** (-9)m** (3) ** (1/2) for covered barley, 44-49x10** (-6)m** (2), 24-31x10** (-9)m** (3) for Japonical-type rough rice and 40-42x10** (-6)m** (2), 21-24x10** (-9)m** (3) for Indica-type rough rice respectively. The surface area and the volume of covered barley more rapidly increased with moisture content than rough rice and between rice samples, these of Japonica-type rough rice a little rapidly increaeed with moisture content than Indica-type rough rice. The regression equations of physical dimensions, surface area and volume of each grain were developed as function of moisture content and the exponential equations of surface and volume of each sample were also determined as a function of physical dimensions at two moisture levels.
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