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%.
Heat Transfer Performance During Condensation Inside Spiralled Micro-Fin Tubes
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.
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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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