Open Access

ARTICLE

Tubular Heat Enhancement Using Twisted Tape Inserts with Large Holes

by Ali Jaber Abdulhamed^*, Aws Al-Akam, Wisam J. Khudhayer, Ali Sabri Allw

Faculty of Engineering - Al-Mussayib, University of Babylon, Hilla, Babylon, 15001, Iraq

* Corresponding Author: Ali Jaber Abdulhamed. Email:

Energy Engineering 2024, 121(2), 273-290. https://doi.org/10.32604/ee.2023.045583

Received 31 August 2023; Accepted 25 October 2023; Issue published 25 January 2024

Abstract

Heat augmentation techniques play a vital role in the heating and cooling processes in industries, including solar collectors and many applications that utilize heat exchangers. Several studies are based on inserting fillers inside the tubes to enhance heat transfer. This investigation considered the effects of twisted tapes with large holes on a tubular heat exchanger’s (HX) heat transmission, pressure drop, and thermal boosting factor. In the experimental section, counter-swirl flow generators used twisted tapes with pairs of 1.0 cm-diameter holes and changes in porosity (R_p) at 1.30% and 2.70%. In the experiments, air was utilized as a working fluid in a tube with a circular cross-section. The turbulent flow was considered, with Reynolds numbers (Re) domain from 4800 to 9500, and a boundary condition with a uniform wall heat flux was constructed. The findings expound that when the number of holes rose, the Nusselt number (Nu), the factor of friction (f), and the thermal enhancement factor (η) all increased as well. Additionally, as the friction factor increased, the Nusselt number of the tape-equipped tube was noticeably higher. Additionally, it was discovered that the friction factor was between 70% and 94% lower than the values of the tube without tape, while the (Nu) was between 87% and 97% higher than the conventional tube values. The maximum value of η is 89%. According to the experimental results, empirical correlations for Nu, f, and η were also generated.

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Keywords

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