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Numerical and Experimental Determination of Thermal Performance of Perforated Variable Pitch Twisted Tape Insert

A.S. Deshpande, S.Y. Bhosale, H.N. Deshpande


In recent years, studies are being done to enhance heat transfer techniques to reduce the thermal resistance either by increasing the effective heat transfer surface area or by generating turbulence. To achieve this, in tube in tube heat exchangers, variety of tube inserts such as twisted tape, wire coil, swirl flow generator etc. are used. The effectiveness of a heat transfer enhancement technique is evaluated by the Thermal Performance Factor which is a ratio of the change in the heat transfer rate to change in friction factor. In this research work, different types twisted tape tube inserts with variable geometries like variable twist pitch of twisted tapes, twisted tape with perforations; winglets etc., are studied in order to comprehend the prevailing mechanism of fluid flow and heat transfer. Accordingly an attempt has been made to explore new geometry of twisted tape having perforations with variable pitch. This new geometry will be numerically and experimentally studied to elucidate the fluid flow behavior that controls the heat transfer rates across the thermal boundary layer attached to the tube wall.

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Morteza Khoshvaght-Aliabadi, Mehdi Eskandari (2015), “Influence of twist length variations on thermal–hydraulic specifications of twisted-tape inserts in presence of Cu–water nano fluid”, Volume 61, pp. 230–240.

Nemat Mashoofi, Saman Pourahmad, SM Pesteei (2017), “Study the effect of axially perforated twisted tapes on the thermal performance enhancement factor of a double tube heat exchanger”, Volume 443, pp. 163-179.

Yan He, Li Liu, Pengxiao Li, Lianxiang Ma (2017), “Experimental study on heat transfer enhancement characteristics of tube with cross hollow twisted tape inserts”, S1359−4311, pp. 35445−5.

MMK Bhuiya AK Azad, MSU Chowdhury, M Saha (2016), “Heat transfer augmentation in a circular tube with perforated double counter twisted tape inserts”, Volume 123, pp. 223–234.

A Hasanpour, M Farhadi, K Sedighi (2017), “Intensification of heat exchangers performance by modified and optimized twisted tapes”, Volume 120, pp. 276–285.

Anucha Saylroy, Smith Eiamsa-ard (2016), “Periodically fully-developed heat and fluid flow behaviors in a turbulent tube flow with square-cut twisted tape inserts”, S1359-4311, 32714−4.

Suttisak Kunlabud, Varesa Chuwattanakul, Vichan Kongkaitpaiboon, Pitak Promthaisong, Smith Eiamsa-ard (2017), “Heat transfer in turbulent tube flow inserted with loose-fit multi-channel twisted

tapes as swirl generators”, Volume 89, pp. 433−443.

Amar Raj Singh Suri, Anil Kumar, Rajesh Maithani (2017), “Heat transfer enhancement of heat exchanger tube with multiple square perforated twisted tape inserts: Experimental investigation and correlation development”, Volume 10, pp. 161−168.

Pengxiao Li, Zhichun Liu, Wei Liu, Gang Chen (2015), “Numerical study on heat transfer enhancement characteristics of tube inserted with centrally hollow narrow twisted tapes”, Volume 88, pp. 481–491.


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