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Étude de deux refroidisseurs à microcanaux avec différents mécanismes de couplage de l'effet Joule-Thomson distribué et du transfert de chaleur.

Study on two microchannel coolers with different coupling mechanisms of distributed J-T effect and heat transfer.

Auteurs : CHANG Z., CUI X., SHE H., GENG H.

Type d'article : Article de la RIF

Résumé

As a typical characteristic of the microchannel Joule-Thomson (J-T) coolers, the distributed J-T effect significantly impacts the cooling effect. To investigate the coupling mechanism of distributed J-T effect and heat transfer, two micro-coolers are fabricated by Printed Circuit Board (PCB) technology in this study. The throttling device is removed from the micro-cooler with staggered etched pillars (Cooler-Pillars), resulting in an entire coupling of heat recovery and throttling processes. The heat recovery and throttling structures are preserved in a micro-cooler etched with rectangular microchannels (Cooler-REC), and the two processes couple partly. The performance of the two micro-coolers is investigated experimentally and numerically at the inlet pressure of 2.02∼5.12 MPa. The experimental results show that the mass flow rate and total pressure drop of Cooler-Pillars are higher than Cooler-REC at the same inlet pressure. Compared with Cooler-REC, Cooler-Pillars can reach a lower cold end temperature and has a cold-end temperature of 190.6 K in steady-state operation at 5.03 MPa. A steady-state mathematical model is developed and compared favorably with the experimental results. The simulation result shows that at the same inlet pressure, the overall distribution of J-T coefficients and the total temperature drop caused by distributed J-T effect of Cooler-Pillars are higher. It is also found that the overall Nu distribution of Cooler-Pillars is higher than Cooler-REC, and heat transfer is enhanced, leading to an increase of 64.5% in average unit heat transfer at 5 MPa.

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Format PDF

Pages : 397-406

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    20 €

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    Gratuit

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Détails

  • Titre original : Study on two microchannel coolers with different coupling mechanisms of distributed J-T effect and heat transfer.
  • Identifiant de la fiche : 30030826
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 145
  • Date d'édition : 01/2023
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2022.08.028

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