NATURAL CONVECTION EFFECTS IN STORED GRAINS -A SIMULATION STUDY

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Abstract
A two-dimensional time-dependent numerical model has been developed to study heat and moisture transfer by natural convection in piles of grain. Results have been obtained for a rectangular storage bin with and without a headspace, and a bunker-type storage structure. Contour plots of streamlines, isotherms, velocity vectors and grain moisture content show the effects of natural convection and of fluctuating thermal boundary conditions on the stored grains. The numerical solution also offers an insight into the underlying physical mechanisms of the moisture redistribution in grain bulks.

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