An experimental study on R22 evaporating heat transfer in round and oval microfin tubes has been performed. The oval tube was an elliptic tube of axis ratio 1:1.5, which was fabricated from the round tube with an outer diameter of 9.52 mm and 18 deg helix angle counterclockwise. The test section was a straight horizontal tube of 0.6 m in length and was heated electrically by a tape heater wound on the tube surface. Heat flux of 12 was maintained constant and the range of refrigerant quality was 0.2–0.8. The tests were conducted for evaporation at 15 °C for 30–60 kg/h mass flow rate (mass flux based on the oval tube: 150–300 and the installation angles of the oval tube were varied between 0 and 135 deg in the circumferential direction. The local and average heat transfer and pressure drop characteristics for the oval tube were compared to those for the baseline round tube. The average two-phase heat transfer coefficients for the oval tube were 2–12 percent higher than that for the round tube and pressure drops for both tubes are similar. The single heat transfer coefficient and friction factor correlations for the round and oval microfin tubes are developed within the rms errors of ±5.6 percent and ±10.0 percent, respectively.
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Heat Transfer and Pressure Drop Characteristics During R22 Evaporation in an Oval Microfin Tube
Man-Hoe Kim,
Man-Hoe Kim
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801
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Jeong-Seob Shin,
Jeong-Seob Shin
Department of Mechanical Engineering, Pohang University of Science and Technology, San 31 Hyoja-Dong, Pohang, Kyungbuk 790-784, Korea
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Clark W. Bullard
Clark W. Bullard
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801
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Man-Hoe Kim
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801
Jeong-Seob Shin
Department of Mechanical Engineering, Pohang University of Science and Technology, San 31 Hyoja-Dong, Pohang, Kyungbuk 790-784, Korea
Clark W. Bullard
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division April 28, 2000; revision received November 15, 2000. Associate Editor: H. Bau.
J. Heat Transfer. Apr 2001, 123(2): 301-308 (8 pages)
Published Online: November 15, 2000
Article history
Received:
April 28, 2000
Revised:
November 15, 2000
Citation
Kim, M., Shin, J., and Bullard, C. W. (November 15, 2000). "Heat Transfer and Pressure Drop Characteristics During R22 Evaporation in an Oval Microfin Tube ." ASME. J. Heat Transfer. April 2001; 123(2): 301–308. https://doi.org/10.1115/1.1351894
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