Abstract
A non-linear relationship was observed between kernel volume and moisture content for pigeon pea. The best defined approximate shape was found to be prolate spheroid with an effective diameter of 4·83 mm, mean surface area 67·4 mm 2 , 1000 grain weight of 76 g, and sphericity and roundness about 80% at 14·7% m.c.d.b. In the moisture range 6·3 to 28·2% d.b., the bulk and true densities were found to decrease linearly from 806 to 745 kg/m 3 and 1305 to 1251 kg/m 3 respectively, and porosity decreased linearly with bulk density from 40·4% to 38·2%. The angle of repose increased from 0·38 to 0·44 rad in the moisture range 5·8 to 14·7% d.b. The static coefficient of friction of pigeon pea against a galvanized steel surface increased from 0·26 to 0·37 in the moisture range 6·4 to 28·5%d.b.
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