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Evaluating the Effects of Weather Conditions on the Performance of Structural Fumigation in a Flour Mill Using Computational Fluid Dynamics Simulations

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  073010.(doi:10.13031/2013.23396)
Authors:   Watcharapol Chayaprasert, Dirk E Maier, Klein E Ileleji, Jayathi Y Murthy
Keywords:   Structural Fumigation, Half-Loss Time, Computational Fluid Dynamics, Flour Mill

Validated Computational Fluid Dynamics (CFD) models of structural fumigation were used to perform eleven fumigation simulations under weather conditions of the same time period of different years (1996 – 2006). Although the simulated fumigations were performed for the same time period, year-to-year variations in weather conditions caused significantly different half-loss time (HLT) predictions. The average wind speeds and ambient temperature varied between 1.5 and 5.1 m/s and 16.2 and 29.1 °C, respectively. In extreme cases, the HLT prediction can be more than 100% different (from 10.7 to 23.3 hours), yielding a difference in the achieved Ct products by more than 70% (from 476 to 840 g-hr/m3). These results implied that fumigators should quantify the effectiveness of temporary structural sealing in order to maximize HLT before a fumigation.

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