Abstract
The dynamics of a parallel plate regenerative heat exchanger are studied using a model in which resistance to heat transfer is due to diffusional resistance in the fluid in the direction transverse to flow. The resultant Nusselt number is a function of time as well as longitudinal distance from the entrance of the exchanger and is not a constant, as is assumed in the traditional regerator problem. However, for reasonably large dimensionless longitudinal distances from the entrance, the temperature profiles agree reasonably well with those obtained from the traditional Anzelius-Schumann solution despite the fact that the local Nusselt numbers become very large for large times.
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