Pneumatic conveying characteristics of seeds in a vertical ascending airstream
M. Kroulík, J. Hůla, A. Rybka, I. Honzíkhttps://doi.org/10.17221/32/2014-RAECitation:Kroulík M., Hůla J., Rybka A., Honzík I. (2016): Pneumatic conveying characteristics of seeds in a vertical ascending airstream. Res. Agr. Eng., 62: 56-63.
Pneumatic conveying characteristics were measured in vertical tubes for seeds of selected varieties of cereals, wide-row crops, oil crops, legumes and catch crops. The measured values were used for graphical representation of variation curves for the chosen groups of seeds. The values of the critical air velocity for seeds (velocity of seed lift) were computed. Statistical significance of differences in the mean values of critical velocities of tested seeds was determined. The critical velocity of cereal seeds ranged from 8.03 to 10.54 m/s. Among the crops grown in wide rows the highest critical velocity of seeds was found out in maize (13.29 m/s), the lowest in sunflower seeds (8.38 m/s). In oil crop seeds, the lowest critical velocity was recorded in poppy (4.67 m/s), which was the lowest value of all seed samples of the tested crops. The highest value of the critical velocity was measured in pea seeds (14.85 m/s).Keywords:
sowing machines; aerodynamic properties of seeds; variation curves
kernel. Journal of Food Engineering, 79: 810–816.Csizmazia Z., Polyak N.I. (2001): Movement of particles in the air. Journal of Agricultural Sciences 1. Acta Agraria Debreceniensis: 22–26.Güner M. (2007): Pneumatic conveying characteristics of some agricultural seeds. Journal of Food Engineering, 80, 904-913 https://doi.org/10.1016/j.jfoodeng.2006.08.010Heege H.J. (1970): Verfahren der Breitsaat des Getreides. Grundlagen der Landtechnik. Düsseldorf: 82.Jech J. et al. (2011): Stroje pre rastlinnú výrobu 3. Prague, Profi Press: 368.Khoshtaghaza M.H., Mehdizadeh R. (2006): Aerodynamic properties of wheat kernel and straw materials. Agricultural Engineering International: CIGR Ejournal, FP 05007, Vol.VIII: 1–10.Mahlstedt J. (1972): Pneumatische Saatgutzuteilung bei Sämaschinen für Getreide Breitsaat. KTBL – Berichte über Landtechnik, 145: 94.Neubauer K. et al. (1986): Stroje pro rostlinnou výrobu III.. Prague, VŠZ.Páltik J., Findura P., Polc M. (2003): Stroje pre rastlinnú výrobu – Obrábanie pôdy, sejba. Nitra, SUA in Nitra.Russo G.P. (2011): Aerodynamic measurements. Cambridge, Woodhead Publishing.Srivastava A.K., Goering C.E., Rohrbach R.P., Buckmaster D.R. (2006): Engineering principles of Agricultural Machines. 2nd Ed. St. Joseph USA, Asabe.Stroshine R. (2000): Physical properties of agricultural materials and products. Purdue University, Indiana: 265–272.Tylek P., Walczyk J. (2003): Critical air velocity as separation feature in nuts of European beech (Fagus sylvatica L.). Electronic journal of polish agricultural universities, 6: 4. Available at http://www.ejpau.media.pl/volume6/issue2/forestry/art-04.html