A theoretical and experimental investigation examines the performance of thermal regenerators in which rapid flow cycling is accompanied by large pressure variations with time. This class of regenerators is characterized by two basic parameters: (a) the ratio of the convective heat transfer within the regenerator to the work of compression, and (b) the ratio of the rate of mass storage within the regenerator void volume to the through-flow. The definition of heat exchanger effectiveness is extended to include the effects of mass storage within the regenerator void volume. A method of predicting this effectiveness is presented.

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