Physical Properties of Black Gram (Phaseolus mungo)

Physical properties of black gram (Phaseolus mungo) were evaluated as a function of moisture content in the range of 6.92 to 36.05% d.b.. At a moisture content of 6.92% (d.b.) the average length, width and thickness were 5.20, 4.10 and 3.54 mm, respectively. The thousand grain mass increased from 51 to 55 g. The grain size and grain volume increased from 4.22 to 4.85 mm and 38.1 to 51.2 nun3, respectively, whereas, sphericity increased from 0.811 to 0.836. The bulk and true densities decreased from 824 to 654 kg/m^3 and 1330 to 1128 kg/m^3 whereas, the corresponding bulk porosity increased from 38.04 to 42.02%. The angle of repose varied from 28.4 to 31.1 ° within the studied moisture range. The terminal velocity increased from 10.3 to 12.4 mis whereas, the static coefficient of friction varied from 0.251 to 0.637 over different material surfaces.