Heat-triggered two-phase flow maldistribution in a micromachined cryogenic cooler

H. S. Cao*, S. Vanapalli, H. J. Holland, C. H. Vermeer, H. J.M. ter Brake

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
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Abstract

Counter flow heat exchangers (CFHXs) are essential elements of micromachined Joule–Thomson (JT) cryogenic coolers. The performance of CFHXs has a crucial influence on the overall behavior of JT microcoolers. Flow maldistribution, especially those with phase change, can adversely affect the performance of JT microcoolers. However, the underlying mechanisms of flow maldistribution for two-phase flow in JT microcoolers remain unexplored. Here we report the heat triggered switching of two-phase flow maldistribution in the heat exchanger of JT microcoolers by both microscopic observations and temperature measurements. A measure against flow maldistribution is proposed.

Original languageEnglish
Article number103026
JournalCryogenics
Volume106
DOIs
Publication statusPublished - Mar 2020

Keywords

  • UT-Hybrid-D
  • Heat transfer
  • Maldistribution
  • Microcooler
  • Two-phase flow
  • Heat exchanger

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