Physical properties of cowpea (Vigna sinensis L.) seed
2007
Yalcin, I.
The physical properties of cowpea seed were evaluated as a function of moisture content. The average length, width and thickness were 9.92 mm, 6.87 mm and 6.06 mm, respectively, at 12.01% d.b. moisture content. In the moisture range from 12.01% to 38.90% dry basis (d.b.), studies on rewetted cowpea seed showed that 1000 seed mass increased from 209.23 g to 256.88 g, the projected area from 22.59 to 32.72 mm2, the sphericity from 0.781 to 0.799, the porosity from 50.64% to 51.49% and the terminal velocity from 9.31 m s-1 to 9.61 m s-1. The static coefficient of friction of cowpea seed increased the linearly against surfaces of four structural materials, namely, rubber (0.364-0.394), aluminium (0.212-0.296), stainless steel (0.176-0.238) and galvanised iron (0.324-0.36) as the moisture content increased from 12.01% to 38.90% d.b. The bulk density decreased from 569.9 to 535.6 kg m-3 and the true density from 1154.8 to 1104.1 kg m-3, respectively, with an increase in moisture content from 12.01% to 39.90% d.b.
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