Heat transfer and flow resistance analysis of a novel freeze-cast regenerator

Jierong Liang*, Cathrine Deichmann Christiansen, Kurt Engelbrecht, Kaspar Kirstein Nielsen, Rasmus Bjørk, Christian Bahl

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The heat transfer and flow resistance of a novel freeze-cast porous regenerator of the magnetocaloric ceramic La0.66Ca0.27Sr0.06Mn1.05O3 was experimentally characterized. Such a porous architecture may be useful as a regenerator geometry in magnetic refrigeration applications due to the sub-millimeter hydraulic diameters that can be achieved. Here the heat transfer effectiveness and friction losses are characterized using experiments and processed with a 1D numerical model. Empirical correlations of the friction factor and Nusselt number are reviewed and chosen for modelling the specific geometry. The experimental results show that the freeze-cast regenerator has increased heat transfer effectiveness and pressure drop compared to reference packed bed regenerators made from epoxy bonded spherical and irregular particles, as well as packed, unbonded spheres. Fixing the pressure drop and regenerator size, the freeze-cast regenerator achieves 10-15% higher heat transfer performance compared to packed bed regenerators.

Original languageEnglish
Article number119772
JournalInternational Journal of Heat and Mass Transfer
Volume155
Number of pages16
ISSN0017-9310
DOIs
Publication statusPublished - 2020

Keywords

  • Freeze-casting
  • Lamellar microchannel
  • Magnetic regeneration
  • Thermal evaluation
  • Thermal regenerator

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