Aerodynamic analysis and performance evaluation of rice milling machine [electronic resource].

Includes references.

Experiments were carried out to derive aerodynamic analysis and evaluate the peiformance qf a rice milling machine. Physical and engineering properties of grains under study have to be considered to study their effect on the pe1.formance of the milling machine. The pe1.formance of the milling machine was studied under the following parameters: feed rate, drum speed, concave clearance and seed moisture content. Peiformance evaluation of the machine was carried out in terms of overall machine efficiency, total grains losses, machine productivity, required power, specific energy and criterion cost. The experimental results reveal that the highest values of machine productivity and overall machine efficiency were 925 kg/h and 92.38%, while the lowest values of required power and specific energy were 9.2 kW and I 1.95 kWh/Mg, furthermore the lowest values of both operational and criterion costs were 9.15 L.E./ Mg and 48.05 L.E./ Mg, respectively. The optimum operating parameters of milling machine were found at 10 m/s air velocity by using 1.4 Mg/h feed rate with 10 mm concave clearance and 850 rpm drum speed at 16 % grain moisture content.

Summary in Arabic.

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