The effect of flow maldistribution in heterogeneous parallel-plate active magnetic regenerators

Kaspar Kirstein Nielsen, Christian R.H. Bahl, Kurt Engelbrecht

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Abstract

The heat transfer properties and performance of parallel plate active magnetic regenerators (AMR) with heterogeneous plate spacing are investigated using detailed models previously published. Bulk heat transfer characteristics in the regenerator are predicted as a function of variation in plate spacing. The results are quantified through a Nusselt number scaling factor that is applied in a detailed 1D AMR model. In this way, the impact of flow maldistribution due to heterogeneous parallel plate stacks on AMR performance is systematically investigated. It is concluded that parallel plate stacks having a standard deviation greater than about 5 % on their plate spacing are severely penalized in terms of both cooling power and achievable temperature span due to the inhomogeneity of the stacks.
Original languageEnglish
JournalJournal of Physics D: Applied Physics
Volume46
Pages (from-to)105002
Number of pages7
ISSN0022-3727
DOIs
Publication statusPublished - 2013

Keywords

  • Flow maldistribution
  • Active magnetic regenerator
  • Parallel plate heat exchanger
  • Magnetocaloric effect
  • Magnetic refrigeration

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