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RESEARCH PAPERS: Evaporation, Boiling, and Condensation

Condensation From Pure Steam and Steam–Air Mixtures on Integral-Fin Tubes in a Bank

[+] Author and Article Information
Adrian Briggs

Department of Engineering, Queen Mary,  University of London, Mile End Road, Mile End, London, E1 4NS, United KingdomA.Briggs@qmul.ac.uk

Sritharan Sabaratnam

Department of Engineering, Queen Mary,  University of London, Mile End Road, Mile End, London, E1 4NS, United Kingdom

J. Heat Transfer 127(6), 571-580 (Dec 22, 2004) (10 pages) doi:10.1115/1.1915371 History: Received August 31, 2004; Revised December 22, 2004

Data are reported for condensation of steam with and without the presence of air on three rows of integral-fin tubes situated in a bank of plain tubes. The data cover a wide range of vapor velocities and air concentrations. Unlike previously reported data for plain tubes using the same test bank and apparatus, the heat-transfer coefficients for the finned tubes were largely unaffected by vapor velocity. When compared to a plain tube of fin-tip diameter and at the same vapor side temperature difference, heat-transfer enhancement ratios between 3.7 and 4.9 were found for the finned tubes compared to a plain tube in quiescent vapor conditions, while values between 1.9 and 3.9 were found when compared to a plain tube at the same vapor velocity. When compared to the plain tubes, the heat transfer to the finned tubes was much more susceptible to the presence of noncondensing gas (air) in the vapor, with enhancement ratios falling as low as 1.5 compared to the plain tubes when even small concentrations of air were present.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Apparatus (TC indicates position of thermocouple)

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Figure 2

Test sections and tube geometry

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Figure 3

Coolant-side data for instrumented plain tubes

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Figure 4

Results for pure steam condensing on plain tube rows for present and previous investigations

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Figure 5

Results for pure steam condensing on plain and finned tube rows

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Figure 6

Variation of vapor-side heat-transfer coefficients with row for pure steam condensing on plain and finned tube banks

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Figure 7

Curve fit lines for pure steam plain and finned tube data

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Figure 8

Variation of vapor-side, heat-transfer coefficients with row for steam–air mixtures condensing on finned tube bank

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Figure 9

Comparison of steam–air data for plain and finned tube banks with single tube theory

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