4. Conclusions
The shape of the lentil seed was found to be a disc shape with dimensions of diameter and thickness. Diameter, thickness, porosity, mass of 1000 seeds and angle of repose linearly increased with increase in moisture content but bulk density and kernel density decreased linearly with increase in moisture content. The static and kinetic coefficients of friction for lentil seeds increased with increase in moisture content and the highest static and kinetic coefficients of friction were found on a concrete surface and the lowest on a glass sheet among the materials tested. In this study, the physical parameters of lentil seeds are expressed in the form of regression equations as a function of moisture content. Once the moisture content is known the physical parameters can be obtained from these equations. As moisture content depends on weather conditions, these equations can be used for other environmental conditions than those of Bangladesh. These data can also be used for designing machines and storage facilities in Bangladesh as well as other countries.