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Airflow Resistance of Some Pelleted Feed
Authors: S. J. Ray, L. O. Pordesimo, L. R. Wilhelm, M. J. Buschermohle
Keywords: feed, pellets, airflow resistance, bin shape
Cooling and aeration improve or maintain desired quality of pelleted feed products. By knowing the resistance to airflow through feed products, fans can be selected to efficiently achieve proper aeration. Extensive data defining the relationship between airflow and pressure drop per unit depth of material has been published for several types of biological material. There is not much information on the resistance to airflow of pelleted feed products. This study focuses on air resistance through four pelleted product sizes (4.0 mm, 6.7 mm, and 19.4 mm diameters and 33.2 x 34.9 mm cubes). Data has been published for sizes similar to the 6.7 mm pellets and the cubes, but no data is available for the other two sizes. Three bin shapes (round, square, rectangular) containing equal airflow areas were tested. A loose" and a packed fill were also tested for each product size except for the cubes, which was tested at a loose fill only. The data obtained was well represented by Shedd's equation. The shape of the bin proved to be insignificant. The pressure drop increased with the packed fill over the loose fill, but, graphically. the variation of airflow to pressure drop appeared to be the same for both conditions.(Download PDF) (Export to EndNotes)