Experimental investigations were conducted to understand the air flow and heat transfer in louver-fin round-tube two-row two-pass cross-counterflow heat exchangers. The Colburn factor and friction factor were obtained by using the -NTU approach. A three-dimensional computational fluid dynamics model was developed based on a representative unit cell with periodical and symmetric boundary conditions. Analysis of tube-side circuiting effect has been conducted and showed improvement by applying overall nonlinear tube-side fluid temperature boundary conditions. Comparison of heat transfer rate of the first and second rows showed that the first row was much more effective, achieving of the total heat transfer rate, when air velocity changes from . A dimensionless parameter, , was introduced to describe the louver interaction for different fin designs with various louver angles. Using as a criterion to evaluate the heat transfer and pressure loss performance, an optimal was predicted around 0.62.
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Research Papers
Air Flow and Heat Transfer in Louver-Fin Round-Tube Heat Exchangers
H. L. Wu,
e-mail: hailingwu̱02@yahoo.com
H. L. Wu
Advanced Heat Transfer LLC
, 1715 Aaron Brenner Drive, Suite 726, Memphis, TN 38120
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Y. Gong,
Y. Gong
Advanced Heat Transfer LLC
, 1715 Aaron Brenner Drive, Suite 726, Memphis, TN 38120
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X. Zhu
X. Zhu
Advanced Heat Transfer LLC
, 1715 Aaron Brenner Drive, Suite 726, Memphis, TN 38120
Search for other works by this author on:
H. L. Wu
Advanced Heat Transfer LLC
, 1715 Aaron Brenner Drive, Suite 726, Memphis, TN 38120e-mail: hailingwu̱02@yahoo.com
Y. Gong
Advanced Heat Transfer LLC
, 1715 Aaron Brenner Drive, Suite 726, Memphis, TN 38120
X. Zhu
Advanced Heat Transfer LLC
, 1715 Aaron Brenner Drive, Suite 726, Memphis, TN 38120J. Heat Transfer. Feb 2007, 129(2): 200-210 (11 pages)
Published Online: May 21, 2006
Article history
Received:
September 9, 2005
Revised:
May 21, 2006
Citation
Wu, H. L., Gong, Y., and Zhu, X. (May 21, 2006). "Air Flow and Heat Transfer in Louver-Fin Round-Tube Heat Exchangers." ASME. J. Heat Transfer. February 2007; 129(2): 200–210. https://doi.org/10.1115/1.2402180
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