Experimental correlation of pool boiling heat transfer for HFC134a on enhanced tubes: Turbo-E

Seung Woo Yang, Jinhee Jeong, Yong Tae Kang

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


The objectives of this paper are to study the heat transfer characteristics for enhanced surface tubes in the pool boiling and to provide a guideline for the design conditions for the evaporator using HFC134a. The shape of tube surfaces, the wall superheat, and the saturation temperature are considered as the key parameters. Copper tubes (do = 19.05 mm) are treated with different helix angles and the saturation temperatures are controlled from 3 to 16 °C. It is found that the pool boiling heat transfer coefficient decreases with increasing the wall superheat. It is also found that boiling heat transfer coefficients for Turbo-II and Turbo-III are 1.5-3.0 times and 1.2-2.0 times higher than that for Turbo-I without the helix angle, respectively. The higher heat transfer performance from Turbo-II and Turbo-III can be explained by the "bubble detention" phenomenon on the surface without the helix angle for the Turbo-I. The experimental correlations for the pool boiling heat transfer on the present enhanced tubes without (Type I) and with the helix angle (Type II and Type III) are developed with the error bands of ±30%, respectively.

Original languageEnglish
Pages (from-to)130-137
Number of pages8
JournalInternational Journal of Refrigeration
Issue number1
Publication statusPublished - 2008 Jan
Externally publishedYes

Bibliographical note

Funding Information:
This work was financially supported by Korea Energy Management Corporation Grant (2005-E-BD11-P-03-3-010-2005).


  • Correlation
  • Enhanced surface
  • Evaporator
  • Experiment
  • Heat transfer coefficient
  • Pool boiling
  • R134a-tube
  • Refrigeration system

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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