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Computational study of oxygen infiltration due to damage in the silo bag surface

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

Citation:  2007 ASAE Annual Meeting  076172.(doi:10.13031/2013.23346)
Authors:   Silmara Bispo Dos Santos, Marcio Arêdes Martins, Lêda Rita D'Antonino Faroni
Keywords:   Mass transfer, porous media, CFD, hermetic storage

The hermetic storage of grains in silo bag has been used to control the infestation of pests and to preserve the quality of the grain. The anaerobiosis process occurs when the oxygen concentration tends to zero due to the grain respiration. During the filling process and also by action of pests, the silo bag may be damaged so mass transfer due to concentration gradients of carbon dioxide and oxygen will occur. A computational study was carried out in order to verify the oxygen penetration depth around holes in the bag silo and the resulting deterioration risk in a grain mass of maize. The mathematical model considers both oxygen diffusion flux and its consumption rate due to grain respiration. The numerical model was implemented using the finite volume method in body fitted coordinates. Distribution of oxygen concentration as a function of time was obtained by computational simulation for three temperatures. Due to low diffusion rate of oxygen in the porous media and the oxygen consumption by respiration process, the penetration depths were calculated as few centimeters.

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