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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Condensation on a Horizontal Wire-Wrapped Tube

[+] Author and Article Information
Takahiro Murase, Adrian Briggs

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

Hua Sheng Wang

Department of Engineering, Queen Mary,  University of London, Mile End Road, London E1 4NS, UKh.s.wang@qmul.ac.uk

John W. Rose

Department of Engineering, Queen Mary,  University of London, Mile End Road, London E1 4NS, UKj.w.rose@qmul.ac.uk

J. Heat Transfer 127(11), 1207-1213 (Jun 20, 2005) (7 pages) doi:10.1115/1.2039113 History: Received January 17, 2005; Revised June 20, 2005

Measurements for film condensation of steam, R113 and ethylene glycol on a horizontal wire-wrapped tube are reported. All measurements were made at near atmospheric vapor pressure and with coolant at around 20°C. Care was taken to avoid error due to the presence of air in the vapor. Complete wetting (film condensation) was observed in all cases. Wire diameter and pitch of winding were systematically varied and heat-transfer measurements made for a range of coolant flow rates. Data, in the form of heat flux and vapor-to-surface temperature difference, are presented. These were used to determine enhancement ratios (ratio of heat flux or heat-transfer coefficient for a wire-wrapped tube to the corresponding value for a plain tube at the same vapor-to-surface temperature difference). Enhancement ratios exceeding 3 for R113 and 2 for steam and ethylene glycol were obtained. The results are discussed in the light of earlier measurements and theory.

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Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Condensate film between adjacent wires in Fujii (3) theory

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Figure 2

Example of geometry incompatibility (compare Fig. 1) in Fujii (3) theory (R11, d=18mm, saturation pressure 1.02bar, saturation temperature 24°C).

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Figure 3

Condensate retention between adjacent wires

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Figure 5

Location of thermocouples in the tube wall (inside diameter di=8.35mm, outside diameter do=12.2mm)

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Figure 6

Effect of variable properties on curve fit

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Figure 7

Dependence of heat flux on vapor-to-surface temperature difference for condensation of R113 (B is 0.758 for smooth tube, vapor velocity 0.23m∕s).

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Figure 8

Dependence of heat flux on vapor-to-surface temperature difference for condensation of ethylene glycol (B is 0.766 for smooth tube, vapor velocity 0.41m∕s)

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Figure 9

Dependence of heat flux on vapor-to-surface temperature difference for condensation of steam (B is 0.835 for smooth tube, vapor velocity 0.57m∕s)

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Figure 10

Dependence of enhancement ratio on pitch for condensation of R113 (vapor velocity 0.23m∕s)

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Figure 11

Dependence of enhancement ratio on pitch for condensation of ethylene glycol (vapor velocity 0.41m∕s)

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Figure 12

Dependence of enhancement ratio on pitch for condensation of steam (vapor velocity 0.57m∕s)

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