This paper presents the pressure drop data and the analysis of adiabatic flow in horizontal and vertical smooth and microfin tubes at saturation temperatures around . The test tubes had inner diameter smooth tube and a melt-down diameter microfin tube. The test was performed over a mass flux range of and at saturation temperatures of and . The effects of various parameters—mass flux, saturated temperature, and tube diameter—on pressure drop were qualitatively analyzed. The analyses showed that the frictional pressure drop characteristics of vertical two-phase flow were much different from that of the horizontal two-phase flow. The microfin tube can be considered as “very rough tube” having the roughness of “fin height.” The data were compared with several correlations. The existing frictional pressure drop correlation is sufficient to predict the horizontal pressure drop in smooth tube. For the vertical pressure drop, the simple combination of the frictional pressure drop and void fraction model was in comparatively good agreement. However, the qualitative results showed that there were some limits to cover the different mechanisms related to the interfacial shear stress. The average enhancement factors and penalty factors evidenced that it was not always true that the internally finned geometry guaranteed the superior in-tube condensation performance of microfin tube in refrigeration system and air-conditioning systems.
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November 2008
This article was originally published in
Journal of Heat Transfer
Research Papers
Adiabatic Horizontal and Vertical Pressure Drop of Carbon Dioxide Inside Smooth and Microfin Tubes at Low Temperatures
Yoon Jo Kim,
Yoon Jo Kim
The George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332
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Jeremy Jang,
Jeremy Jang
Department of Mechanical Science and Engineering,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
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Predrag S. Hrnjak,
Predrag S. Hrnjak
Department of Mechanical Science and Engineering,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
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Min Soo Kim
Min Soo Kim
School of Mechanical and Aerospace Engineering,
Seoul National University
, Seoul 151-742, Korea
Search for other works by this author on:
Yoon Jo Kim
The George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332
Jeremy Jang
Department of Mechanical Science and Engineering,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
Predrag S. Hrnjak
Department of Mechanical Science and Engineering,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
Min Soo Kim
School of Mechanical and Aerospace Engineering,
Seoul National University
, Seoul 151-742, KoreaJ. Heat Transfer. Nov 2008, 130(11): 111001 (10 pages)
Published Online: September 3, 2008
Article history
Received:
August 13, 2007
Revised:
May 6, 2008
Published:
September 3, 2008
Citation
Kim, Y. J., Jang, J., Hrnjak, P. S., and Kim, M. S. (September 3, 2008). "Adiabatic Horizontal and Vertical Pressure Drop of Carbon Dioxide Inside Smooth and Microfin Tubes at Low Temperatures." ASME. J. Heat Transfer. November 2008; 130(11): 111001. https://doi.org/10.1115/1.2957595
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