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1 Technical Sciences / University of Warmia and Mazury in Olsztyn

1 2016

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Influence of moisture on external friction coefficient and basic physical properties of Astoria variety wheat grain

Markowska A., Warechowska M., Warechowski J.

Technical Sciences / University of Warmia and Mazury in Olsztyn

2016

nr 19(1)

17--26

This paper analyzed the effect of moisture content on selected physical properties of Astoria variety wheat grain using six levels of grain moisture content (14%, 16%, 18%, 20%, 22% and 24%). The following were determined for each level of moisture content: angle of repose, static angle of repose (SAR), bulk density and thousand kernel weight. The friction coefficients for four different construction materials (CEF) were also determined: acid-resistant steel, wear-resistant steel, plastic (PPLD) and rubber. It was found that an increasing moisture content in grains was accompanied by an increase in the thousand kernel weight, angle of repose, SAR, as well as the CEF against each of the surfaces used in the study. The highest value of the CEF was recorded for a rubber surface (0.782) and the smallest was for a polypropylene surface (0.443). The highest values of the angle of repose and the SAR were recorded for the grain with the highest moisture content: 37.15o and 39.44o, respectively. An increase in the moisture content in kernels reduced their bulk density from 79.870 kg · hl–1 (moisture content: 14%) to 68.783 kg · hl–1 (moisture content 24%).