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DTIC ADA218563: Nucleate Pool Boiling Performance of Smooth and Fin...
by Defense Technical Information Center
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Heat-transfer measurements were made for boiling of
refrigerants and refrigerant/oil mixtures from smooth and
finned tube bundles. The bundles contained 15 heated
tubes arranged in an equilateral triangular pitch of 19.1
mm. The outside diameter of the smooth tubes (15.8 mm)
was equal to the diameter to the tip of the fins of the
finned tubes. The smooth tube bundle was tested in pure R-
113 with varying surface histories as well as tested in
pure R-114/oil mixtures. The finned tube bundle was
tested in pure R-114/oil mixtures. Oil concentrations
used were 1, 2, 3, 6, and 10% by mass. The majority of
data sets were taken with decreasing heat flux where
hysteresis is normally not seen as shown in present
experiments when using the simulation heaters. The
addition of oil to the smooth tube bundle showed heat-
transfer performance to increase over that measured with
pure R-114 up to a 6% concentration. The maximum
enhancement in heat-transfer performance of the smooth
tube bundle was around 44% with R-114 and 2% oil.
Performance was only slightly degraded from the case of
pure R-114 at the maximum oil concentration of 10%. Heat-
transfer performance was more than doubled for the finned
tubes when compared to that for the smooth tubes.
Addition of oil to a concentration of 3% by mass, yielded
a maximum increase in finned-tube performance of 22% over
that measured with pure R-114. Theses.
Date Published: 2018-02-25 03:23:18
Identifier: DTIC_ADA218563
Item Size: 382494750
Language: english
Media Type: texts
# Topics
DTIC Archive; Anderson, Carl L ; NAVA...
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