Aerodynamic properties of Turgenia latifolia seeds and wheat kernels
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Department of Agriculture Machinery Engineering, University of Tabriz, Tabriz, Iran
Int. Agrophys. 2010, 24(1): 57-61
Aerodynamic properties of solid materials have long been used to convey and separate seeds and grains during post harvest operations. Turgenia latifolia (broadleaf false carrot) seeds that interfere with milling of wheat can be separated by some type of pneumatic means if aerodynamic properties of these two materials are well known. The objective of this study was evaluation of the aerodynamic properties of Turgenia latifolia seeds and wheat kernels as a function of moisture content, 7 to 20.8% w.b. The results showed that the terminal velocity of wheat kernels increased non-linearly from 9.587 to 9.25 m s-1 for an increase in moisture content. Over this same moisture content the terminal velocity of Turgenia latifolia seeds varied from 6.775 to 6.877 m s-1. The drag coefficient of wheat kernels and Turgenia latifolia seeds decreased nonlinearly from 0.0543 to 0.0528 and 0.0512 to 0.0458, respectively, as moisture content increased from 7 to 20.8% w.b. The analysis of variance showed that there was a significant difference between the terminal velocity and the drag coefficient of wheat and Turgenia latifolia seeds at the 1% probability level. The moisture content had a significant effect on the terminal velocity of wheat kernels.
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