Multi-directional resistance to airflow in grain and its influence on pressure pattern prediction
1991
Mojado-Dante, Ann Izel
Rough rice and soybeans were tested for their resistance to airflow in both vertical and horizontal airflow directions and resulting air pressure distribution in the grain mass. Rough rice showed higher airflow resistance than soybeans. In both grains, the resistance to airflow decreased with an increase in moisture content. However, an increase in resistance to airflow was observed with an increase in bulk density and grain depths. Resistance to airflow in rough rice and soybeans was found to be greater in vertical airflow direction than the horizontal airflow direction. The resistance to airflow in the horizontal direction was about 0.4 and 0.2 the resistance to airflow in the vertical direction for rough rice and soybeans, respectively. Grain bed depth had the greatest effect on airflow resistance in comparison with moisture content and bulk density based on ANOVA results. The nonlinear regression models for each grain at each airflow direction adequately described the relationship between the static pressure drop, airflow rate, bulk density, grain moisture content, and bed depth. The pressure pattern predictions based on the equations obtained from vertical airflow direction give about 12 and 30 percent less error for rough rice and soybeans, respectively, compared with the predictions based on the equations obtained from horizontal airflow direction.
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