Micromachines (Jul 2017)

Numerical Investigation of Miniature Ejector Refrigeration System Embedded with a Capillary Pump Loop

  • Jing-Ming Dong,
  • He Song,
  • Meng-Qi Yu,
  • Wei-Ning Wang,
  • Xin-Xiang Pan

DOI
https://doi.org/10.3390/mi8080235
Journal volume & issue
Vol. 8, no. 8
p. 235

Abstract

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A miniature steam ejector refrigeration system embedded with a capillary pump loop can result in a compact design which can be used for electronics cooling. In this paper, computational fluid dynamics (CFD) is employed to investigate the effects of the area ratio of the ejector constant-area mixing section to the nozzle throat, the length of the constant-area section, and the nozzle exit position (NXP), on the performance of a miniature steam ejector. Results show that the performance of the miniature steam ejector is very sensitive to the area ratio of the constant-area mixing section to the nozzle. For the needs of practical application, the area ratio of the constant-area mixing section to the nozzle should be smaller than 16 when the temperature of the primary flow is 60 °C. The NXP plays an important role in the flow phenomena inside the miniature ejector. The critical back pressure is more sensitive to length of the constant-area mixing section than the entrainment ratio. Results of this investigation provided a good solution to the miniature steam ejector embedded with a capillary pump loop for electronics cooling application.

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