Moisture dependent physical properties of Iranian tree almonds, soft and hard shelves (coefficient of friction and filling angle of repose)

In this study, the physical properties of tree almond nuts and kernel (soft shell, and hard shell) were evaluated as a function of moisture from 4.89% to 26.17%. The results showed that friction coefficient for soft shell tree almond was the higher that that for the hard shell one (p<0.05). Coefficients of friction of all experimental samples increased by an increase in moisture content. The maximum coefficient of friction, 0.682733, calculated on play wood for all types of tree almond's nut and kernel. However, the lowest coefficient of friction among all whole nut samples was for galvanized sheet iron (0.513833), and for all kernels was on glass (0.570568). The angle of repose in hard shell nut, 60.58092477ₒ, was the highest value among all tested samples (p<0.05).