Title: Exergetic performance analysis of concentric tube heat exchanger with V-cut twisted tape inserts and Al₂O₃+MWCNT nanofluid

Authors: Sumit Kumar Singh; Mayaram Sahu; Weon Gyu Shin

Addresses: Department of Mechanical Engineering, Chungnam National University, Daejeon-34134, South Korea ' Department of Mechanical Engineering, Panipat Institute of Engineering and Technology, Samalkha, Panipat, Haryana -132102, India ' Department of Mechanical Engineering, Chungnam National University, Daejeon-34134, South Korea

Abstract: This study investigates the performance of Al₂O₃+MWCNT hybrid nanofluid of volume concentration of 0.01% in concentric tube heat exchangers using V-cut twisted tape inserts. The effect of various flow rates (5-25 lpm) and geometric parameters (V-cut depth ratio, V-cut width ratio, and Twist ratio) on exergetic performance parameters were analysed. Results revealed that exergy and irreversibility rate increase with twist and depth ratios while decreasing with width ratio. Second law efficiency increases with twist and width ratios but declined with the depth ratio. Altering the V-cut inserts affects thermal and frictional entropy generation. These findings can optimise heat exchanger design for industrial applications.

Keywords: concentric tube heat exchanger; V-cuts twisted tape; exergy; hybrid nanofluids; irreversibility; entropy generation.

DOI: 10.1504/IJEX.2023.134290

International Journal of Exergy, 2023 Vol.42 No.1, pp.115 - 126

Received: 18 Apr 2023
Accepted: 02 Jun 2023
Published online: 17 Oct 2023 *

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