Thermal characteristics in a heat exchanger tube fitted with zigzag‐winglet perforated‐tapes

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Published: Aug 21, 2018
Keywords:
Thermal performance zigzag-winglet perforated-tape Nusselt number Reynolds number

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S. Suwannapan
Department of Mechanical Engineering, Faculty of Engineering, Rajamangala University of Technology Isan, Khonkaen Campus, 150 Srichan Road, Muang, Khonkaen, 40000, Thailand
S. Skullong
Department of Mechanical Engineering, Faculty of Engineering at Si Racha, Kasetsart University Sriracha Campus, 199 M.6, Sukhumvit Rd., Sriracha, Chonburi 20230, Thailand
P. Promvonge
Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand

Abstract

The paper presents an experimental investigation on enhanced heat transfer and pressure loss characteristics using zigzag-winglet perforated-tape inserts (ZW-PT) in a round tube having a uniform heat-fluxed wall for the turbulent air flow, Reynolds number (Re) from 4200 to 26,000. In the present work, the ZWPT having the winglet attack angle of 45° were inserted into the test tube at two different winglet pitch ratios (P/D = PR=1 and 1.5) and four winglet-width or blockage ratios (b/D = BR=0.1, 0.15, 0.2 and 0.25). The experimental results of the heat transfer and pressure drop in terms of the respective Nusselt number (Nu) and friction factor (f), respectively, reveal that the Nu and f increase with the increment of BR and Re but with the decreasing PR. The Nu for the inserted tube is in a range of 3.1-5.1 times above that for the plain tube while the f is around 12.5-53.6 times. In addition, the use of the ZW-PT with PR=1.0 leads to better thermal enhancement factor (TEF) than that with PR=1.5 around 3-5%.

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How to Cite
Suwannapan, S., Skullong, S., & Promvonge, P. (2018). Thermal characteristics in a heat exchanger tube fitted with zigzag‐winglet perforated‐tapes. Journal of Research and Applications in Mechanical Engineering, 3(1), 29–36. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/141535
Issue
Vol. 3 No. 1 (2015)
Section
RESEARCH ARTICLES

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