Predicting hygroscopic loads in grain storage bins
1995
Zhang, Q. | Britton, M.G.
A predictive model has been developed for hygroscopic (moisture-induced) loads in grain storage bins. Swelling of a wetted grain kernel is assumed to be equal to the volume of water absorbed by the kernel. The volumetric strain of the grain bulk caused by moisture changes is calculated from swelling of individual grain kernels. Model predictions of hygroscopic strain are in close agreement (less than or equal to 3%) with an empirical correlation reported in the literature. Predicted hygroscopic pressure is 1.6 times higher than one of values observed by Dale and Robinson (1954) in model bin tests. For a hypothetical bin 6.15 m high and 4.20 m in diameter, the model predicts hygroscopic overpressure factors ranging from 5.0 to 8.6 for an increase of 10% d.b. (dry basis) in grain moisture content for shelled corn with bulk densities between 681 and 771 kg/m3.
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