Abstract
A fundamental study on the transient characteristics of a vertical rectangular porous heat storage, which was composed of a fluid (liquid) and spherical solid particles, has been numerically carried out under one vertical wall exposed to a constantheat-flux condition while other walls thermally insulated. The present study has clarified the effects of the porosity, the heatflux as a receiving heat, thermophysical properties and the dimensions of the heat storage (aspect-ratioH/W, height to width of the rectangular cavity) on the transient characteristics of the porous heat storage proposed. It was concluded that the natural convection occurred in the heat storage had an important role in evaluating the transient heat transfer characteristics, that is, the convection occurred had contributed to shortening the time period until the quasi-steady state after starting the heating to the heat storage and to homogenizing thermally the porous heat storage.
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