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Moisture-dependent physical properties of jatropha seed (Jatropha curcas L.)

Garnayak, D.K., Pradhan, R.C., Naik, S.N., Bhatnagar, N.
Industrial crops and products 2008 v.27 no.1 pp. 123-129
weight, Jatropha curcas, diameter, seeds, surface area, materials, seed oils, bulk density, oil crops, water content, biofuels, friction, shape, angle of repose
The study was conducted to investigate some moisture-dependent physical properties of jatropha seed namely, seed dimension, 1000 seed mass, surface area, sphericity, bulk density, true density, angle of repose and static coefficient of friction against different materials. The physical properties of jatropha seed were evaluated as a function of moisture content in the range of 4.75-19.57% d.w. The average length, width, thickness and 1000 seed mass were 18.65mm, 11.34mm, 8.91mm and 741.1g, respectively at moisture content of 4.75% d.w. The geometric mean diameter and sphericity increased from 12.32 to 12.89mm and 0.66 to 0.67 as moisture content increased from 4.75 to 19.57% d.w., respectively. In the same moisture range, densities of the rewetted jatropha seed decreased from 492 to 419kgm-³, true density increased from 679 to 767kgm-³, and the corresponding porosity increased from 27.54 to 45.37%. As the moisture content increased from 4.75 to 19.57% d.w., the angle of repose and surface area were found to increase from 28.15° to 39.95° and 476.78 to 521.99mm², respectively. The static coefficient of friction of jatropha seed increased linearly against the surfaces of three structural materials, namely plywood (44.12%), mild steel sheet (64.15%) and aluminum (68.63%) as the moisture content increased from 4.75 to 19.57% d.w.