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Mesures interférométriques à résolution spatiale et temporelle de la couche limite thermique d'une plaque de gadolinium magnétisée périodiquement.

Space-and time-resolved interferometric measurements of the thermal boundary layer at a periodically magnetized gadolinium plate.

Auteurs : LEI Z., YANG X., HABERSTROH C., et al.

Type d'article : Article, Article de la RIF

Résumé

By means of a Mach-Zehnder interferometer we examine the transient dynamics of heat transfer from two periodically magnetized gadolinium (Gd) plates into a heat transfer fluid (n-decane). We demonstrate that the propagation of the thermal fronts emanating from the Gd plates after magnetization or demagnetization obeys a View the MathML sourcet-dependence. A finite time required for magnetization and demagnetization causes a spatially delayed propagation of the thermal fronts. The diffusive heat flux, derived from the temperature profiles, experiences a drop down by about 80% after first 3 s while the percentage of thermal energy transferred into n-decane experiences a maximum there. Although limited to heat transfer into a stagnant fluid, the present works provides reasons for lower bounds of geometry and operation frequency of a simplified parallel-plate structure in the diffusive limit. In this way, the results are instructive for an efficient design of a parallel-plate magnetic regenerator with forced convection.

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Format PDF

Pages : 246-255

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Détails

  • Titre original : Space-and time-resolved interferometric measurements of the thermal boundary layer at a periodically magnetized gadolinium plate.
  • Identifiant de la fiche : 30015199
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 56
  • Date d'édition : 08/2015

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