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Convective flow of refrigerant (R-123) across a bank of micro pin fins.

Author(s) : KOSAR A., PELES Y.

Type of article: Article

Summary

An experimental study has been performed on single-phase heat transfer, boiling inception, and pressure drop of R-123 over a bank of shrouded micro pin fins 243 lm long with hydraulic diameter of 99.5 lm. Heat transfer coefficients and Nusselt numbers have beenobtained over effective heat fluxes ranging from 3.5 to 65.5 W/cm2 and Reynolds numbers from 134 to 314. A delay in boiling incipiencehas been observed and a meta-stable single-phase region was apparent at liquid exit temperatures noticeably exceeding the saturationtemperature. Once boiling was initiated, vapour burst instabilities resembling the compound relaxation instabilities were attained. It has also been found that endwalls effects on heat transfer diminished for Re higher than 100. [Reprinted with permission from Elsevier. Copyright, 2006].

Details

  • Original title: Convective flow of refrigerant (R-123) across a bank of micro pin fins.
  • Record ID : 2007-0107
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 49 - n. 17-18
  • Publication date: 2006/08

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