Moisture-dependent physical properties of green peas (Pisum sativum L.)
2018
Zarringhalami, S. | Bimakr, M. | Jalili Safaryan, M. | Ghorbani, M. | Ganjloo, A.
This study was conducted to evaluate some moisture-dependent physical properties of green peas (Pisum sativum L.) at the range of 75.15 to 15.21% w.b. In this moisture content range, the length varied from 10.48 to 7.28 mm, the width from 8.93 to 5.80 mm, the thickness from 8.61 to 5.15 mm, the arithmetic mean diameter from 9.34 to 6.07 mm, and the geometric diameter from 9.10 to 5.90 mm. Similarly, the sphericity from 86% to 81%, the aspect ratio from 85.20 to 79.67%, the surface area from 260.15 to 109.35 mm2, the one thousand mass from 547.46 to 188.89 g, the porosity from 42.02 to 40.75%, the angle of repose from 40.62° to 20.50°, and the terminal velocity from 11.88 to 9.21 m/s. In the same moisture range, the bulk and true density increased from 630.76 to 670.70 kgm-3 and from 1088 to 1132 kgm-3, respectively. The static coefficient of friction showed a decrease of 30.64%, 23.53%, 27.76% and 27.50% for the surfaces of rubber, plywood, galvanised iron sheet and glass, respectively. Regression models adequately expressed the relationships existing between the physical properties of green pea seeds with the moisture content. In the considered range of moisture content, all of these physical properties exhibited moisture dependence according to linear relationships except the surface area which showed second-order polynomial.
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