Enhancing heat transfer for laminar flow in heat pipes using perforated and jagged-edged twisted tapes: An experimental study

Khaled Mohamed Ashnaaf Abajja, Selcuk Selimli, Abdulmunaem Mohamed Abdullah Shaneb and Ibrahim Ali M. Eljetlawi

Energy, 2025, vol. 325, issue C

Abstract: Twisted tapes are applied to improve heat transfer, which is directly related to a rise in pressure drop primarily because of the secondary swirl flow. This paper presents experimental research on the thermal and hydrodynamic characteristics of twisted tapes in a copper tube under uniform heat flux and a single-phase laminar water flow. The tube is equipped with a perforated twisted tape (PT), a typical twisted tape (TT), and a jagged twisted tape (JT). Experimental data was obtained to analyze the influence of Reynolds numbers (500 ≤ Re ≤ 2300) and twist ratios (2.0 ≤ y/w ≤ 4.0) on thermal and hydrodynamic characteristics. The maximum percentage augmentation of Nusselt number relative to an empty tube is around 84.06 %, 85 %, and 85.4 % for TT, PT, and JT, respectively. The greatest Performance Evaluation Criteria (PEC) value was 4.68 for PT with a twist ratio of 2. The plain test tube data was validated for the friction factor and the Nusselt number using empirical correlations, showing variations of approximately ±5.24 % and ±10.49 %, respectively, when compared to reference values. For TT, the Nusselt number agreed with the experimental data, while the maximum variance was ±11.7 % when validated using empirical correlations.

Keywords: Twisted tape; Heat transfer enhancement; Passive method (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:325:y:2025:i:c:s0360544225017839

DOI: 10.1016/j.energy.2025.136141

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