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Experimentally validated model of transient heat transfer between a magnetocaloric packed particle bed and stagnant interstitial fluid.

Number: pap. 2027

Author(s) : SCHROEDER M. G., BREHOB E., BENEDICT M.

Summary

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 fluid 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 use in the heat transfer model. Finally, a correction factor was applied to the model to reduce error when compared with experimental results.

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Pages: 10 p.

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Details

  • Original title: Experimentally validated model of transient heat transfer between a magnetocaloric packed particle bed and stagnant interstitial fluid.
  • Record ID : 30018812
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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