Indirect measurement of local condensing heat-transfer coefficient around horizontal finned tubes
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Authors
Lester, Donald J. Jr.
Subjects
steam
condensation
filmwise
condensate retention
heat-transfer coefficient
finned tubes
condensation
filmwise
condensate retention
heat-transfer coefficient
finned tubes
Advisors
Marto, P.J.
Wanniarachchi, A.S.
Date of Issue
1987-09
Date
September 1987
Publisher
Language
en_US
Abstract
Heat-transfer measurements were made for condensation of
steam on three finned tubes with rectangular-section fins.
These tubes have a fin thickness and fin height of 1.0 mm and
fin spacings of 0.5, 1.0 and 1.5 mm. Data were taken by insulating
both the inner and outer surfaces over up to 5 or 6
angular portions, including 0, 30, 60, 90, 150, 210 degrees,
of the top portion of each tube. The measured average heattransfer
coefficients for the unblanked portion of the tube
were processed to yield both the local and average heattransfer
performance as a function of the angle measured from
the top of the tube using a third-order polynomial.
The results show that the average enhancement for the fin
spacings of 0.5, 1.0 and 1.5 mm were 2.5, 3.0 and 3.1,. respectively,
for the atmospheric-pressure condition. And they
were 1.8, 2.3 and 2.4 for the low-pressure condition. The
local enhancements at the top of tubes were 5.2 and 3.8 for
s = 0.5 mm, 6.6 and 4.8 for 3=1.0 mm, and 6.6 and 5.5 for
s = 1.5 mm at atmospheric and low pressures, respectively.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
National Science Foundation
Funder
National Science Foundation
Format
126 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.