Flow boiling heat transfer coefficients and pressure drops of FC-72 in small channel heat sinks

Yonghee Jang, Chasik Park, Yongtaek Lee, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


In this study, the heat transfer and pressure drop characteristics of FC-72 in small channel heat sinks, which were designed for liquid cooling of electronic components, were measured by varying the mass flux, saturation temperature, and vapor quality. The small channels had circular cross-sections with diameters of 2 and 4 mm and length of 100 mm. The heat flux provided by the heaters in the copper block ranged from 0.5 to 3.0 W/cm2. Based on data comparisons, the existing pressure drop correlations were modified by introducing the effective viscosity including wall effects of the fluid in the small channel. The modified homogeneous pressure drop model yielded the best predictions with average and mean deviations of 0.9% and 27.0%, respectively. The measured heat transfer coefficient was also compared with the predictions obtained by using the existing heat transfer correlations. The Kandlikar correlation with the fluid surface parameter for water yielded consistent trends with the measured heat transfer coefficient. A new fluid surface parameter FFl = 0.747 for FC-72 was proposed based on the present data, and satisfactory predictions were obtained with average and mean deviations of 0.4% and 7.0%, respectively.

Original languageEnglish
Pages (from-to)1033-1041
Number of pages9
JournalInternational Journal of Refrigeration
Issue number6
Publication statusPublished - 2008 Sept

Bibliographical note

Funding Information:
This research was supported by the Korea Science and Engineering Foundation (grant no. R01-2002-000-00481-0).


  • Boiling
  • Experiment
  • FC-72
  • Heat transfer
  • Micro-channel
  • Pressure drop

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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