Abstract
Various gas mixtures are often passed through seed stored in bulk for the purposes of fumigation, drying or cooling. When designing or analysing any of these systems it is very useful to know the time taken for the gas to reach a specified position in the bulk. Traverse times also indicate the position of temperature and moisture fronts since the speed of these fronts is directly proportional to the speed of the gas. Conformal mapping can be used to approximate flowfields in aerated seed bulks. From these flowfields the traverse time distribution is calculated for several common duct and store geometries. For five of the six geometries analysed, simple anisotropy can be accounted for in the formulae for traverse time. Hohner and Brooker have reported the results of a crossflow aeration experiment and these show good agreement with the traverse time distribution function derived herein for the same geometry.
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