Abstract
When air is passed through a seed bulk or other porous hygroscopic media, temperature and moisture state changes occur by means of the passing of two fronts. It is demonstrated that the occurrence of temperature and moisture fronts is a consequence of the conservation equation and the equilibrium equation. The prediction of speeds of temperature and moisture fronts is shown to be very sensitive to the accuracy of the fitting of the isotherm data. A method is derived by which the dwell state (that prevailing after the passing of the temperature front and before the passing of the moisture front) can be estimated without recourse to numerical integration. Finally, some explicit approximate expressions are given for the speeds of temperature and moisture fronts.
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