Investigation of turbulent heat transfer in round tubes fitted with regularly spaced overlap dual twisted tape elements

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Published: Aug 14, 2018
Keywords:
Dual swirl flows dual twisted tapes flow-field heat transfer enhancement

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W. Changcharoen
Faculty of Engineering, Mahanakorn University of Technology, Bangkok, Thailand
P. Somravysin
Faculty of Engineering, Mahanakorn University of Technology, Bangkok, Thailand
P. Promthaisong
Faculty of Engineering, Mahanakorn University of Technology, Bangkok, Thailand
P. Eiamsa-ard
Faculty of Industrial Technology, Phetchaburi Rajabhat University, Phetchaburi, Thailand
K. Nanan
Faculty of Industrial Technology, Phetchaburi Rajabhat University, Phetchaburi, Thailand
S. Eiamsa-ard
Faculty of Engineering, Mahanakorn University of Technology, Bangkok, Thailand

Abstract

A numerical investigation of turbulent forced convection in three-dimensional tubes with twisted tape inserts is performed in order to gain an understanding of physical behavior of the fluid flow (overlap dual swirling flows), fluid temperature and local Nusselt number in the tubes fitted with RS-O-DTs. Effects of the regularly spaced overlap dual twisted tape elements (RS-O-DTs) in counter arrangement on heat transfer and friction factor in circular tubes are reported. Computations, based on a finite volume method, are performed by utilizing the RNG k-ε turbulence model. Parametric runs are made for Reynolds numbers between 5000 and 15,000 at various free space ratios (s/W = 2.0, 3.0, and 4.0). From the numerical results reveal that the tube with the RSO- DTs with the smallest free space ratio (s/W = 2.0), yield higher heat transfer rate by about 180% over the plain tube, and by around 3.1% and 4.0%, over the tubes with RS-O-DTs with s/W = 3.0 and 4.0, respectively.

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How to Cite
Changcharoen, W., Somravysin, P., Promthaisong, P., Eiamsa-ard, P., Nanan, K., & Eiamsa-ard, S. (2018). Investigation of turbulent heat transfer in round tubes fitted with regularly spaced overlap dual twisted tape elements. Journal of Research and Applications in Mechanical Engineering, 3(2), 64–74. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/140048
Issue
Vol. 3 No. 2 (2015)
Section
RESEARCH ARTICLES

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