The influence of demagnetizing effects on the performance of active magnetic regenerators

Kaspar Kirstein Nielsen, Anders Smith, Christian Bahl, Ulrik Lund Olsen

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Active magnetic regenerators (AMR) comprise an involved, multi-physics problem including heat transfer, fluid flow, magnetocaloric properties and demagnetizing fields. In this paper a method is developed that combines previously published models that simulate a parallel-plate AMR and the magnetostatics of a stack of parallel plates, respectively. Such a coupling is non-trivial due to the significant increase in computational time and a simplified scheme is thus developed and validated resulting in little extra computational effort needed.
A range of geometrical and operating parameters are varied and the results show that not only do demagnetizing effects have a significant impact on the AMR performance, but the magnitude of the effect is very sensitive to a range of parameters such as stack geometry (number of plates, dimensions of the plates and flow channels and overall dimensions of the stack), orientation of the applied field and the operating conditions of the AMR (such as thermal utilization).
Original languageEnglish
JournalJournal of Applied Physics
Volume112
Pages (from-to)094905
Number of pages8
ISSN0021-8979
DOIs
Publication statusPublished - 2012

Cite this

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title = "The influence of demagnetizing effects on the performance of active magnetic regenerators",
abstract = "Active magnetic regenerators (AMR) comprise an involved, multi-physics problem including heat transfer, fluid flow, magnetocaloric properties and demagnetizing fields. In this paper a method is developed that combines previously published models that simulate a parallel-plate AMR and the magnetostatics of a stack of parallel plates, respectively. Such a coupling is non-trivial due to the significant increase in computational time and a simplified scheme is thus developed and validated resulting in little extra computational effort needed.A range of geometrical and operating parameters are varied and the results show that not only do demagnetizing effects have a significant impact on the AMR performance, but the magnitude of the effect is very sensitive to a range of parameters such as stack geometry (number of plates, dimensions of the plates and flow channels and overall dimensions of the stack), orientation of the applied field and the operating conditions of the AMR (such as thermal utilization).",
author = "Nielsen, {Kaspar Kirstein} and Anders Smith and Christian Bahl and Olsen, {Ulrik Lund}",
year = "2012",
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volume = "112",
pages = "094905",
journal = "Journal of Applied Physics",
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publisher = "American Institute of Physics",

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The influence of demagnetizing effects on the performance of active magnetic regenerators. / Nielsen, Kaspar Kirstein; Smith, Anders; Bahl, Christian; Olsen, Ulrik Lund.

In: Journal of Applied Physics, Vol. 112, 2012, p. 094905.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The influence of demagnetizing effects on the performance of active magnetic regenerators

AU - Nielsen, Kaspar Kirstein

AU - Smith, Anders

AU - Bahl, Christian

AU - Olsen, Ulrik Lund

PY - 2012

Y1 - 2012

N2 - Active magnetic regenerators (AMR) comprise an involved, multi-physics problem including heat transfer, fluid flow, magnetocaloric properties and demagnetizing fields. In this paper a method is developed that combines previously published models that simulate a parallel-plate AMR and the magnetostatics of a stack of parallel plates, respectively. Such a coupling is non-trivial due to the significant increase in computational time and a simplified scheme is thus developed and validated resulting in little extra computational effort needed.A range of geometrical and operating parameters are varied and the results show that not only do demagnetizing effects have a significant impact on the AMR performance, but the magnitude of the effect is very sensitive to a range of parameters such as stack geometry (number of plates, dimensions of the plates and flow channels and overall dimensions of the stack), orientation of the applied field and the operating conditions of the AMR (such as thermal utilization).

AB - Active magnetic regenerators (AMR) comprise an involved, multi-physics problem including heat transfer, fluid flow, magnetocaloric properties and demagnetizing fields. In this paper a method is developed that combines previously published models that simulate a parallel-plate AMR and the magnetostatics of a stack of parallel plates, respectively. Such a coupling is non-trivial due to the significant increase in computational time and a simplified scheme is thus developed and validated resulting in little extra computational effort needed.A range of geometrical and operating parameters are varied and the results show that not only do demagnetizing effects have a significant impact on the AMR performance, but the magnitude of the effect is very sensitive to a range of parameters such as stack geometry (number of plates, dimensions of the plates and flow channels and overall dimensions of the stack), orientation of the applied field and the operating conditions of the AMR (such as thermal utilization).

U2 - 10.1063/1.4764039

DO - 10.1063/1.4764039

M3 - Journal article

VL - 112

SP - 094905

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

ER -