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Technical Brief

Characterization of heat transfer by overlapped-quadruple counter tapes

[+] Author and Article Information
Professor Smith Eiamsa-ard

Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand
smith@mut.ac.th

P. Samruaysin

Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand
artmodify@hotmail.com

1Corresponding author.

ASME doi:10.1115/1.4040785 History: Received March 06, 2018; Revised June 30, 2018

Abstract

This paper deals with the influence of overlapped-quadruple twisted tape (OQT) and typical quadruple twisted tape (QT) on the enhancing heat transfer rate in a heat exchanger tube. Effects of tube orientation (co-tapes and counter tapes), tape arrangement (cross and parallel arrangments) and overlapped twist ratio (yo/y = 0.625, 0.75 and 0.875) were investigated. The experiments were performed in turbulent flow regime (5,000 ?Re?20,000) under uniform wall heat flux boundary condition, using air as the testing fluid. The experimental results indicates all overlapped-quadruple tapes (OQTs) consistently yield higher Nusselt number and thermal performace than typical quadruple tapes (QTs). The tapes in cross arrangement show better heat transfer enhancement and thermal performance than the ones in parallel arrangement. Heat transfer, friction loss and thermal performance increase with decreasing overlapped twist ratio. The maximum thermal enhancement factor (TEF) of 1.58 is achieved by the use of overlapped-quadruple counter tapes in cross arrangement (CC-OQTs) with yo/y = 0.625 at the lowest Reynolds number of 5000.

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