NDLI: Experimental correlation for flooding vapor velocity in a fluted tube with a twisted insert [heat pumps]

Content Provider	IEEE Xplore Digital Library
Author	Yong-Tae Kang Stout, R. Christensen, R.N.
Copyright Year	1996
Description	Author affiliation: Dept. of Mech. Eng., Ohio State Univ., Columbus, OH, USA (Yong-Tae Kang)
Abstract	This paper develops a flooding correlation from experiments in a fluted tube with a twisted insert for application to absorption heat pump systems. Fluted tubes have been used to enhance both heat and mass transfer during absorption and desorption processes. In the present tests, a plastic twisted tape was inserted to increase the absorption rate in counter current absorption. The effects of the twisted insert and the angle of inclination on the flooding were examined. Water and ethyl alcohol solution flows downward in the fluted tube while air flows counter current in an upward direction. The flooding mechanism in a fluted tube with a twisted insert was analyzed by visual observation and experimental correlations for the flooding for both vertical and nearly horizontal positions were developed. The experimental data from this paper were compared with those for smooth tubes from the literature. The results show that the flooding initiated from the bottom for the vertical tube and from the top of the tube for the nearly horizontal tube. The fluctuation of the pressure drop for the vertical tube was much stronger than that for the horizontal tube. The effect of the position of the insert was not significant for the nearly horizontal tube while it was somewhat significant for the vertical tube. The superficial flooding vapor velocity for the nearly horizontal position is lower than that for the vertical position for a given liquid mass flow rate.
Starting Page	1047
Ending Page	1054
File Size	625510
Page Count	8
File Format	PDF
ISBN	0780335473
ISSN	10893547
DOI	10.1109/IECEC.1996.553845
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-08-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Floods Absorption Heat pumps Heat transfer Fluid flow Counting circuits Geometry Mechanical engineering Testing Plastics
Content Type	Text
Resource Type	Article

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