The effect of the spiral angle on the heat transfer performance in micro-fin tube condensers has not yet been clearly established because other geometric parameters affecting the heat transfer performance were simultaneously varied in previous studies. This paper reports on the influence of the spiral angle on the heat transfer during condensation inside spiralled micro-fin tubes having all other geometric parameters constant. Tests were conducted for condensation of R-22, R-134a, and R-407C inside a smooth (9.52 mm outer diameter) and three micro-fin tubes with approximately the same diameter, having spiral angles of 10 deg, 18 deg, and 37 deg, respectively. Experimental results indicated a heat transfer augmentation with spiral angle increase. A new semi-empirical predictive correlation was developed for practical design of spiralled micro-fin tubes. The proposed new correlation predicted the majority of experimental results of the present study within a deviation zone of ±20%.
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Heat Transfer Performance During Condensation Inside Spiralled Micro-Fin Tubes
Jean-Pierre M. Bukasa,
Jean-Pierre M. Bukasa
Department of Mechanical Engineering, Rand Afrikaans University, PO Box 524, Auckland Park 2006, Johannesburg, South Africa
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Leon Liebenberg, Associate Professor,,
Leon Liebenberg, Associate Professor,
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa
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Josua P. Meyer, Member ASME (#4032447), Professor and Head,
Josua P. Meyer, Member ASME (#4032447), Professor and Head,
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 000, South Africa
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Jean-Pierre M. Bukasa
Department of Mechanical Engineering, Rand Afrikaans University, PO Box 524, Auckland Park 2006, Johannesburg, South Africa
Leon Liebenberg, Associate Professor,
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa
Josua P. Meyer, Member ASME (#4032447), Professor and Head,
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 000, South Africa
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division November 27, 2002; revision received March 12, 2004. Associate Editor: J. N. Chung.
J. Heat Transfer. Jun 2004, 126(3): 321-328 (8 pages)
Published Online: June 16, 2004
Article history
Received:
November 27, 2002
Revised:
March 12, 2004
Online:
June 16, 2004
Citation
Bukasa, J. M., Liebenberg, L., and Meyer, J. P. (June 16, 2004). "Heat Transfer Performance During Condensation Inside Spiralled Micro-Fin Tubes ." ASME. J. Heat Transfer. June 2004; 126(3): 321–328. https://doi.org/10.1115/1.1737777
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