Aerodynamic Properties of Makhobeli, Triticale and Wheat Seeds

Abstract

A b s t r a c t. The objective of this study was the evaluation of the aerodynamic properties of Makhobeli, triticale and wheat seeds as a function of moisture content from 7 to 27% (w.b). The results showed that the terminal velocity of triticale and wheat seeds increased linearly from 5.37 to 6.42 and from 6.31 to 8.02 m s -1 , respectively, as the moisture content increased from 7 to 27%. Over this same moisture content range, the terminal velocity of Makhobeli seeds varied following a polynomial relationship from 4.52 to 5.07 m s -1 . Makhobeli seeds had terminal velocities with a mean value of 4.73 m s -1 , at different moisture contents, compared to the mean values of 5.89 and 7.13 m s -1 for triticale and wheat seeds, respectively. The mean value of drag coefficient was 1.12 for Makhobeli compared to the values of 0.92 and 0.85 for triticale and wheat, respectively. The analysis of variance showed that there were significant differences between the terminal velocity (at 1% probability level) and drag coefficient (at 5% probability level) of Makhobeli with triticale and wheat seeds, which suggests that aerodynamic separation of Makhobeli from triticale and wheat is possible.K e y w o r d s: separation, post harvest operation, Makhobeli, weed control, triticale, wheat

Aerodynamic properties of lentil seeds

“…Nalbandi et al (2010) reported a polynomial relationship for the terminal velocity of wheat kernels as a function of moisture content. Shahbazi et al (2014) developed polynomial and linear equations between the terminal velocity of Makhobeli, triticale and wheat seeds as functions of moisture content. The following equations were found for the relationship between the terminal velocity (V t , m s -1 ) and moisture content (M, %) for each lentil seed variety:…”

“…The knowledge of the aerodynamic characteristics of grains (terminal velocity, drag coefficient) is significant for the design and operation of machines which treat substances with air flow and in all cases when substances are moved in the air (Shahbazi et al, 2014). The behaviour of particles in an air stream during pneumatic conveying and separation greatly depends on their aerodynamic properties.…”

Fuzzy Knowledge-Based Model for Prediction of the Terminal Velocities of the Chickpea and Dry Bean Seeds

“…To determine the V t value of chick pea and dry bean seeds, a vertical wind tunnel was designed based on recommendations by Nalbandi et al(2010), Shahbazi, et al(2014) and Afonso et al (2007). A centrifugal fan powered by 0.37 kW motor was used in the inlet of the wind tunnel to supply air flow.…”

Aerodynamic properties of Faba bean (<italic>Vicia faba</italic> L.) Seeds

“…The drag coefficient value of faba bean seeds decreased with moisture content. It was reported that the drag coefficient values of sunflower, Makhobeli, triticale and wheat seeds also decreased linearly with moisture content (Gupta et al, 2007;Shahbazi et al,2014). The mean drag coefficient values of Makhobeli, triticale and wheat seeds were reported to be 1.12, 0.92 and 0.85, respectively (Shahbazi et al,2014).…”

“…The leaves and straws of crops generally have lower terminal velocity values than their seeds have. The cleaning of seeds from foreign materials such as weed seeds, straws, hulls and chaffs by pneumatic separation is widely used in agricultural production and agroindustry since it is relative cheap, effective and has high capacity (Shahbazi et al,2014;Zewdu, 2007). Turgania latifolia (a common weed) seeds were separated from wheat seeds by pneumatic separation since its seeds have lower terminal velocity values (6.775 to 6.877 m·s -1 ) than wheat seeds (9.587 to 9.25 m·s -1 ) have (Nalbandi et al, 2010).…”