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Journal of Enhanced Heat Transfer

Impact factor: 0.400

ISSN Print: 1065-5131
ISSN Online: 1563-5074

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v10.i4.10
pages 355-362

Heat Transfer Measurements for Condensation of Steam on a Horizontal Wire-Wrapped Tube

Adrian Briggs
School of Engineering and Materials Science, Queen Mary, University of London, London E1 4NS, UK
H. S. Wang
Department of Engineering, Queen Mary, University of London, London E1 4NS, UK
T. Murase
Department of Engineering, Queen Mary, University of London, London E1 4NS, UK
John W. Rose
School of Engineering and Materials Science, Queen Mary, University of London, London E1 4NS, UK

ABSTRACT

New measurements for film condensation of steam on a horizontal, water-cooled, wire-wrapped tube are reported. Care was taken to avoid error due to the presence of air in the vapor and dropwise condensation. 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 vaporto-surface temperature difference). Enhancement ratios up to about 2 were obtained. The results are discussed in the light of earlier measurements and theory.