Heat transfer and pressure drop characteristics of water flow in horizontal tubes with/without longitudinal inserts used as a heat exchanger tubing was experimentally studied. Testing was performed on bare tubes and tubes with square and rectangular as well as crossed-strip inserts with aspect ratios and 4 and varied ratios of inlet mixed mean temperature to wall temperature of 0.88 to 0.97. The Reynolds number ranged from approximately 250 to 1750 for flow visualization and from 1700 to 4000 for the pressure drop and heat transfer measurements. Flow visualization, using a dye injection method, revealed a highly complex flow pattern including a secondary flow formed in the cross section for crossed-strip inserts. The thermal entrance length was found and correlated in terms of Re for this type of inserted tubes. The enhancement of heat transfer as compared to a conventional bare tube at the same Reynolds number based on the hydraulic diameter was found to be about a factor of 16 at Re⩽4000, while the friction factor rise was only about a factor of 4.5 at Re⩽4000. [S0022-1481(00)01303-7]
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Heat Transfer and Pressure Drop of Laminar Flow in Horizontal Tubes With/Without Longitudinal Inserts
S.-S. Hsieh, Sun Yat-Sen Professor of Mechanical Engineering, Dean of Engineering, Fellow ASME,
S.-S. Hsieh, Sun Yat-Sen Professor of Mechanical Engineering, Dean of Engineering, Fellow ASME
National Sun Yat-Sen University, Kaohsiung, Taiwan R.O.C.
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I.-W. Huang, Graduate Student,
I.-W. Huang, Graduate Student,
Department of Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan R.O.C.
Search for other works by this author on:
S.-S. Hsieh, Sun Yat-Sen Professor of Mechanical Engineering, Dean of Engineering, Fellow ASME
National Sun Yat-Sen University, Kaohsiung, Taiwan R.O.C.
I.-W. Huang, Graduate Student,
Department of Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan R.O.C.
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division, Jan. 8, 1999; revision received, Dec. 14, 1999. Associate Technical Editor: J. Han.
J. Heat Transfer. Aug 2000, 122(3): 465-475 (11 pages)
Published Online: December 14, 1999
Article history
Received:
January 8, 1999
Revised:
December 14, 1999
Citation
Hsieh, S., and Huang, I. (December 14, 1999). "Heat Transfer and Pressure Drop of Laminar Flow in Horizontal Tubes With/Without Longitudinal Inserts ." ASME. J. Heat Transfer. August 2000; 122(3): 465–475. https://doi.org/10.1115/1.1287502
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