Partager

Document IIF

Effets des structures géométriques sur l'échangeur de chaleur à milieu poreux à des températures inférieures à 1 Kelvin.

Effects of geometric structures on the sub-Kelvin porous media heat exchanger.

Auteurs : SHANG X. S., GONG H., ZENG X., WANG B., CAO H., SHAO W., CUI Z.

Type d'article : Article de la RIF

Résumé

A dilution refrigerator is an essential apparatus for achieving sub-Kelvin temperatures. Porous-media heat exchangers used inside dilution refrigerators at temperatures below 100 mK are crucial components that determine their optimal performance. In this study, a numerical model of a porous-media heat exchanger is developed. The local thermal non-equilibrium heat transfer model captures the Kapitza heat transfer between solid and fluid components, whereas the coupled Brinkman-Forchheimer and Navier-Stokes equations describe fluid flows in porous media. Results indicate that a liquid gap can enhance the thermal conduction between the flow channel and porous media, thus improving the heat-exchange efficiency of the porous media. For a constant-volume and -thickness porous media, the most suitable length-to-width ratio is 5. The concentrated phase exhibits a lower outlet temperature, whereas the dilute phase exhibits an appropriate pressure drop. For a constant-volume and -length porous media, the optimal width-to-thickness ratio is 10, which provides the best thermal and hydrodynamic performances. For a full-width liquid gap, increasing its thickness enhances both the thermal and hydrodynamic performances but also increases the usage of 3He. Under a constant volume of liquid gap, a partial-width liquid gap can improve the heat-exchange efficiency, thus achieving better thermal and hydrodynamic performances than the conventional full-width one.

Documents disponibles

Format PDF

Pages : 207-216

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Effects of geometric structures on the sub-Kelvin porous media heat exchanger.
  • Identifiant de la fiche : 30032258
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 160
  • Date d'édition : 04/2024
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2024.02.012

Liens


Voir d'autres articles du même numéro (33)
Voir la source

Indexation