Conference Year

2016

Keywords

magnetocaloric, transient, regenerator, packed bed, stagnant

Abstract

Typical simulations of packed bed active magnetocaloric regenerators rely on correlations of Nusselt number as a function of Reynolds number. These models are well understood for large ranges of Reynolds number, but experimental data is lacking as Reynolds number approaches zero.  Within a typical magnetocaloric refrigeration cycle a zero velocity or dwell condition is present.  When a cycle is heat transfer rate limited, heat transferred during dwell represents a significant portion of total heat transferred for a full cycle and must be accurately represented. An experiment was performed in order to validate a basic heat transfer model between a packed magnetocaloric particle bed and stagnant interstitial fluid. A second experiment was performed to measure average particle sphericity using a modified version of the Ergun equation, such that both particle size and sphericity are known for validation of the heat transfer model.

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