Publication:
Filmwise condensation of steam on low integral-finned tubes

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Authors
Georgiadis, Ioannis V.
Subjects
Steam
Condensation
Filmwise
Tube
Low-integral fin
Heat-transfer coefficient
Enhancement
Advisors
Marto, P.J.
Wanniarachchi, A.S.
Date of Issue
1984-09
Date
September 1984
Publisher
Language
en_US
Abstract
Filmwise condensation heat-transfer measurements if steam were made on horizontal tubes under vacuum and near-atmospheric pressures. Data were taken for a smooth tube and for 21 tubes which contained rectangularly-shaped, low integral fins. The fin geometry was systematically varied in order to investigate the dependence of the steam-side heat-transfer coefficient on fin spacing, thickness and height. The condensation process was found to be most sensitive to fin spacing and to be weakly dependent on fin thickness. When the fin height was increased from1.0 to 2.0 mm, the increase in the heat-transfer coefficient was about 20 percent, while the increase in condensing area was 51 percent. The best performing finned tube had a fin spacing of 1.5 mm, a fin thickness of 1.0 mm and a fin height of 2.0 mm. It showed an enhancement over the smooth tube of between 4 to 5 under vacuum conditions and around 6 at atmospheric conditions. Thus, the use of finned tubes may result in a significant reduction in the size and weight of present-day steam condensers.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
NPS-69-84-008
Sponsors
National Science Foundation, Division of Engineering
Funder
MEA82-03567
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner
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