Moisture-dependent physical properties of wheat
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Department of Agricultural Machinery Engineering, University of Tehran, Karaj, Iran
Int. Agrophys. 2003, 17(4): 207-211
The various physical properties of five varieties of wheat were evaluated for moisture content in the range of 0 to 22% d.b. The average length, width, thickness and thousand-kernels weight were 7.08, 3.27, 2.98 mm and 29.6 g at a moisture content of 7.4% d.b. The average length for dry land farming wheat varieties was longer than for that irrigated. The average geometric mean diameter and percentage of sphericity was 4.26 and 60. Studies on rewetted wheat showed that the bulk and true densities decreased from 740 to 538.8 kg m-3 and 1240 to 847.2 kg m-3, whereas the corresponding bulk porosity increased. The static coefficient of friction varied from 0.279 to 0.450 over different material surfaces, while the dynamic angle of repose varied from 34.7 to 45° within the moisture range studied.
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