Some engineering properties of paddy (var. Sazandegi)
2007
Varnamkhasti, M.G. (Tehran Univ., Karaj (Iran). Dept. of Agricultural Machinery) | Mobli, H. (Tehran Univ., Karaj (Iran). Dept. of Agricultural Machinery) | Jafari, A. | Rafiee, S. | Heidarysoltanabadi, M. | Kheiralipour, K.
Physical and engineering properties of agricultural grains are necessary for the design of storage, handling and processing equipment. In this study, some physical properties of raw paddy (var. Sazandegi) are discussed briefly. At moisture content of 10% (wet basis), the average grain length, width and thickness were 8.54, 2.47 and 1.83 mm, respectively while the equivalent mean diameter, surface area and volume were 3.4 mm, 32.58 mm2 and 21.06 mm3, respectively. The sphericity and aspect ratio were 39.88 and 0.29%, respectively. True density, bulk density and porosity were 1193.38 kg m-3, 471.16 kg m-3 and 60.37%, respectively while the static coefficient of friction varied from 0.2186 on glass sheet to 0.4279 on plywood. The angle of repose for emptying was 35.83 degree. Nonlinear model for describing the mass of paddy grain was investigated, too. In this regard mass was estimated with single variable of kernel length with a determination coefficient as 0.869.
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