This study was aimed to develop simple empirical equations to predict engineering properties of edible sunflower seed (cultivar of GALAMI) and material other grain (MOG) including of hollow seeds and chaff material for designing and setting equipment of cleaning and separation. The properties were evaluated at four levels of moisture content from 30% to 7% (w.b.) (moisture of harvesting to processing). The variation in moisture content showed a statistically significant effect on physical and

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... rodynamic properties. As the moisture content decreased from 30% to 7% (w.b), length, width, thickness, equivalent diameter, sphericity for seeds (GALAMI), and the projected area, coefficient of static friction, static angle of repose for all materials decreased, whereasthe true density and porosity of Seeds (GALAMI) decreased from 561.02 to 457.29kg/m3 and 63.35% to 52.41% respectively, however this value for Chaff materials increased from 822.57 to 897.56 kg/m3 and 89.19% to 90.64% respectively. The coefficient of static friction (μ) was determined for three different surfaces (plywood, rubber and mild steel). The highest difference of value between seeds (GALAMI) with Chaff material and Hollow seeds was in mild steel surface and moisture content of 30%. The value of terminal velocity of all material decreased with decreasing moisture content. The highest average terminal velocity was at moisture content of 30% that for Seeds (GALAMI), Hollow seeds and Chaff material obtained 7.08, 3.62 and 3.39 m/srespectively, and the lowest was at the moisture content of 7% for all material, and reported 5.46, 2.70 and 2.60 m/s respectively. With decrease in moisture content, drag coefficient tended to increase, So that its value for Seeds (GALAMI), Hollow seeds and chaff materials changed from 0.59 to 0.95, 0.80 to 1.42 and 098 to 1.53 respectively. According to this investigation complete theoretical separation of seeds from MOG using air and physical properties of product is possible at various moisture contents. Citation: Chavoshgoli.,Es., Sh. Abdollahpour, R. Abdi, and A. Babaie. 2014. Engineering properties of sunflower seeds and materials other grain as moisture content for equipment of separator. AgricEngInt: CIGR Journal, 17(1):10-21