Abstract: This study was conducted to investigate some moisture dependent physical
and mechanical properties of green laird lentil grains namely, grain dimensions,
thousand grain mass, surface area, projected area, sphericity, bulk density,
true density, porosity, terminal velocity, static coefficient of friction
against different materials. The average diameter and thickness were 6.72
and 2.58 mm, at a moisture content of 11.36% d.b., respectively. In the
above moisture range, the arithmetic and geometric mean diameters increased
from 5.340 to 5.685 mm and from 4.879 to 5.260 mm, respectively,
while the sphericity decreased from 0.727 to 0.744. In the moisture
range from 11.36-25.08% d.b., studies on rewetted green laird lentil grains
showed that the thousand grain mass increased from 72.00 to 73.90 g, the
projected area from 36.98 to 55.60 mm2, the true density from
1170 to 1420 kg m-3, the porosity from 29.91 to
55.63% and the terminal velocity from 5.90 to 7.10 m s-1. The bulk density decreased from 820 to 630 kg m-3
with an increase in the moisture content range of 11.36-25.08% d.b. The
static coefficient of friction of green laird lentil grains increased
against surfaces of six structural materials, namely, rubber (0.51-0.58),
aluminum (0.48-0.57), stainless steel (0.38-0.44), galvanized iron (0.42-0.50),
glass (0.35-0.40) and MDF (medium density fiberboard) (0.31-0.36) as the
moisture content increased from 11.36-25.08% d.b. |