Thermo-hydraulic performance investigation of a heat exchanger tube inserted with twisted tapes modified with various twist ratio and alternate axis

Year 2022, , 189 - 195, 20.09.2022

Mahmut Uyanık Toygun Dağdevir , Veysel Ozceyhan

https://doi.org/10.26701/ems.1032081

Cited By: 2

Abstract

This paper presents a numerical investigation on a heat transfer enhancement by using a computational fluid dynamics software. The heat transfer enhancement is implemented by inserting twisted tape into a heat exchanger tube. The twisted tapes with twist ratios of 4, 6 and 8 were modified with alternate axis. The pitch of the twisted tape having the rotation direction such as clockwise and counterclockwise are connected with 90º connection angle. Water is selected as working fluid and turbulent flow condition corresponding to Reynolds number ranging from 5000 to 29000 are considered in the study. The heat exchanger tube is under constant heat flux of 50 kW/m2. Numerical analysis results prove that the use of twisted tape improves thermal performance compared to smooth tube. As the twist ratio increased, the heat transfer performance and the friction loss penalty decreased. Overall results are determined with thermohydraulic performance criteria (THP). The highest THP value is obtained as 1.21 for the tube inserted with the twisted tape which has the twist ratio of 4 and alternate axis between the twist pitches at Reynolds number of 5913

Keywords

Heat transfer enhancement, twisted tape, alternate axis, friction factor, performance evaluation criteria.

Supporting Institution

Erciyes University

Project Number

FYL-2020-10681

Thanks

The authors acknowledge the financial, laboratory, and infrastructure support provided by the Scientific Research Projects Coordination Unit, Erciyes University, Turkey (FDK-2020-10681).

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