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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v6.i2-4.120
pages 237-250

The Effect of Fin Height During Steam Condensation on A Horizontal Stainless Steel Integral-Fin Tube

Ashoke Das
Gauhati UNiversity, Department of Mechanical Engineering, Naval Postgraduate School, Monterey, CA 93943-5100
George A. Incheck
Department of Mechanical Engineering, Naval Postgraduate School, Monterey, CA 93943-5100
Paul J. Marto
Department of Mechanical Engineering, Naval Postgraduate School, Monterey, CA 93943-5100

ABSTRAKT

Film-condensation heat transfer on horizontal stainless steel integral-fin tubes was experimentally studied to examine the effect of fin height. Experiments were conducted at both atmospheric and vacuum conditions on eight stainless steel tubes with rectangular fins of nominal heights ranging from 0.2 mm to 1.5 mm. The fin spacing and fin thickness were kept constant at 1.5 mm and 1 mm respectively for all the tubes. The tubes had a nominal inside diameter of 13.11 mm and a nominal root diameter of 14.25 mm.
The experimental results show that condensation heat transfer is affected considerably by surface-tension effects and low thermal conductivity of the stainless steel tubes. For the tube geometry tested, the results show an optimum fin height around 0.3 mm, with a corresponding heat transfer enhancement of 1.4 and 1.6 respectively for vacuum and atmospheric conditions. A comparison with theoretical models shows that the model of Honda et al. (1987) predicts the data most closely, though all the models fail to predict the optimum fin height.