Flow boiling heat transfer coefficients of are measured in a horizontal smooth tube with inner diameter . The test tube is heated by a secondary fluid maintaining constant wall temperature conditions. Heat transfer coefficients are measured at evaporation temperatures of and , mass flux from , and heat flux from for qualities (vapor mass fractions) ranging from 0.1 to 0.8. The characteristics of flow boiling are explained by properties and flow patterns. The measured heat transfer coefficients are compared to other published data. Experiments with R22 were also conducted in the same system and the results show that the heat transfer coefficients for are 40 to 150% higher than for R22 at and low mass flux of mostly due to the characteristics of nucleate boiling. The presented heat transfer coefficients indicate the reduction of heat transfer coefficient as mass flux increases at low quality regions and also show that dryout does not occur until the high quality region of 0.8, for mass fluxes of 200 and . The Gungor and Winterton correlation gives a relatively good agreement with measured data; however it deviates more at lower evaporation temperature and high mass flux conditions.
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December 2005
This article was originally published in
Journal of Heat Transfer
Research Papers
Flow Boiling Heat Transfer of at Low Temperatures in a Horizontal Smooth Tube
Chang Yong Park,
Chang Yong Park
Department of Mechanical and Industrial Engineering,
University of Illinois at Urbana-Champaign
, 1206 West Green Street, Urbana, Illinois 61801
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Pega S. Hrnjak
Pega S. Hrnjak
+1-217-244-6377
+1-217-333-1942
Department of Mechanical and Industrial Engineering,
e-mail: pega@uiuc.edu
University of Illinois at Urbana-Champaign
, 1206 West Green Street, Urbana, Illinois 61801
Search for other works by this author on:
Chang Yong Park
Department of Mechanical and Industrial Engineering,
University of Illinois at Urbana-Champaign
, 1206 West Green Street, Urbana, Illinois 61801
Pega S. Hrnjak
+1-217-244-6377
+1-217-333-1942
Department of Mechanical and Industrial Engineering,
University of Illinois at Urbana-Champaign
, 1206 West Green Street, Urbana, Illinois 61801e-mail: pega@uiuc.edu
J. Heat Transfer. Dec 2005, 127(12): 1305-1312 (8 pages)
Published Online: March 18, 2005
Article history
Received:
January 6, 2005
Revised:
March 18, 2005
Citation
Park, C. Y., and Hrnjak, P. S. (March 18, 2005). "Flow Boiling Heat Transfer of at Low Temperatures in a Horizontal Smooth Tube." ASME. J. Heat Transfer. December 2005; 127(12): 1305–1312. https://doi.org/10.1115/1.2098853
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