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Analysis of Friction and Heat Transfer Characteristics of Tubes with Trapezoidal Cut Twisted Tape Inserts

Shrikant Arunrao Thote*, Netra Pal Singh
Department of Mechanical Engineering, Oriental University, Indore, 453555, India
* Corresponding Author: Shrikant Arunrao Thote. Email:
(This article belongs to this Special Issue: Advances in Fluid Dynamics and Functional Materials)

Fluid Dynamics & Materials Processing 2023, 19(3), 711-722.

Received 26 January 2022; Accepted 16 March 2022; Issue published 29 September 2022


The thermo-hydraulic properties of circular tubes with a twisted tape inside (used accordingly to induce turbulence and enhance heat transfer through the tube wall) are described for Reynolds Numbers ranging from 830 to 1990. Tapes twisted with the three distinct twist ratios are considered, namely, 6, 4.4 and 3. Air is used as the working fluid in several tests. For the sake of comparison, the standard tube with no insert is also examined. It is shown that in the presence of the twisted tape, the ‘frictional factor’, ‘Nusselt Number’ and the ‘thermal performance factor’ are much higher than those obtained for the plain tube. Moreover, the tapes having the lowest twist ratio, i.e., 3, are more effective than the others in terms of heat transfer augmentation. The ‘thermal performance factor’ is greater than one for all the twisted tapes used in the experiments, which confirms the enhanced performances of the heat exchanger and the related savings in terms of total energy.


Friction factor; nusselt number; performance ratio; trapezoidal cut twisted tape insert

Cite This Article

Thote, S. A., Singh, N. P. (2023). Analysis of Friction and Heat Transfer Characteristics of Tubes with Trapezoidal Cut Twisted Tape Inserts. FDMP-Fluid Dynamics & Materials Processing, 19(3), 711–722.

This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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