DETERMINATION OF PHYSICAL PROPERTIES OF SHELLED AND UNSHELLED BAMBARA NUT (Vigna Subterranea L. Verdc.) SEEDS RELATED TO DESIGN OF DECORTICATING MACHINES
Publication Date : 28/04/2020
Physical Properties of Bambara Nut are crucial for the design of harvesting, processing, transport, cleaning, sorting, separation and packaging machinery. Some physical properties of bambara nut have been assessed for both shelled and unshelled seeds. The physical properties of shelled seeds at moisture content of 11.35 percent (db) are length 14.57 mm, width 11.62 mm, thickness 10.34 mm, 70.88 percent roundness, 85.01 percent sphericity, 430.70 mm2 surface area, 634.26 g weight, 455.43 mm3 volume, 769.90 kg/m3 bulk density, 1130.63 kg/m3 solid density, 32.06 percent porosity, angle of repose 23.5º and coefficient of static friction 0.4361. The physical properties of unshelled seed at moisture content of 7.12 percent (db) are length 20.60 mm, width 16.93 mm, thickness 14.41 mm, roundness 76.45 percent, 81.60 percent sphericity, surface area 920.84 mm2, 1012.41 g weight, 321.05 mm3 volume, 355.80 kg/m3 bulk density, 993.76 kg/m3 solid density, 64.16 percent porosity, 25.5º angle of repose and 0.4782 coefficient of static friction. Statistical studies of physical characteristics showed that size (length, width, thickness, geometric diameter), porosity bulk density and surface area of shelled and unshelled seed are extremely important at 5%; weight, sphericity, volume and solid density are important at 5%; roundness, angle of repose and static friction coefficient are not important.
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