Abstract
The formation and behaviour of square and widening temperature and moisture fronts in the equilibrium model of the aeration cooling of grain depends on the variation of front velocity with grain state. This variation is presented in graphs, and is shown to cause the interaction of successive square and widening fronts, which results in the evening out of grain temperature and moisture content profiles. Such evening out measured during Australian field aeration trials of peanuts and wheat is found to be about twice that predicted by an interaction analysis for the equilibrium model, and an estimate of the effect of dispersive mechanisms is shown to account for the difference. A simple formula for obtaining both contributions to evening out is derived. Evening out resulting from interaction of fronts has important implications for grain aeration systems.
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