No abstract

The quality of dried products mainly depends on temperature and moisture content changes during the drying process, as they govern the quality determining reactions that take place during dehydration. The temperature and moisture fields developing in the drying material during drying can be determined by solving the governing differential equations. They describe the heat and mass transport in the material and on its surface. Therefor a lumped parameter model of the drying material was established, using discretization and calculation methods known from aerospace engineering. The paper describes these methods as well as the simulation results for the drying process. It provides information on the dependency of heat and mass transport coefficients on local temperature and moisture content. Finally, the results are compared to experimental results obtained in a previous study.

This paper describes an experimental investigation into the impact of the rate of heating on thermally-induced volume change of saturated, normally consolidated silt using a temperature-regulated oedometer with single-sided drainage. The results indicate that the rate of heating does not lead to a significant impact on the thermal volume change at the end of heating, but it does affect the magnitude of excess pore water pressure generation and the maximum transient contraction. Specimens heated rapidly were observed to initially contract by a greater amount than those heated slowly due to dissipation of excess pore water pressure, but were then observed to expand at the same rate as the heating rate as the dissipation process slowed.