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Cristallisation de nodules sphériques en surfusion dans un écoulement.

Crystallization of supercooled spherical nodules in a flow.

Auteurs : OMARI K. el, DUMAS J. P.

Type d'article : Article

Résumé

The general context of the article concerns the latent heat storage (cold storage) by encapsulated spherical nodules of 7.7 cm in diameter containing a Phase Change Material (PCM) and filling a cylindrical tank (about 2500 nodules per m3). During the storage process, a cold heat transfer liquid flows through the tank to crystallize the PCM inside the nodules. The stored energy is released when a hotter heat transfer liquid flows through the tank to induce the melting of the PCM. As the velocity in the tank is relatively small (a few mm/s), natural convection is expected on the coolant when the latent heat is released at the crystallization of the PCM. The article concerns a single nodule surrounded by a flowing heat transfer liquid at a temperature TC lower than the melting temperature TF. It presents an enthalpic modelling of the phase change inside the nodule coupled with a CFD simulation of the external flow to describe the mutual influence of the natural convection and the kinetics of crystallization. This study is afterwards extended to the case of two superposed nodules to investigate the influence of the crystallization of the lower nodule on the upper one.

Détails

  • Titre original : Crystallization of supercooled spherical nodules in a flow.
  • Identifiant de la fiche : 2005-1153
  • Langues : Anglais
  • Source : International Journal of thermal Sciences - vol. 43 - n. 12
  • Date d'édition : 12/2004

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