THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Xichao Di

,

Ping Tao

,

Meihui Zhou

,

Jianqiu Zhou

NUMERICAL SIMULATION OF HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS IN TWISTED OVAL TUBES

ABSTRACT
The numerical research aims to investigate the heat transfer performance difference between the twisted tube and the smooth tube at the same hydraulic diameter. The effect of the major/minor axis ratios on the fluid-flow inside the twisted oval tube is studied in the Reynolds number range of 3000-11000, and the integral thermal-hydraulic effectiveness of twisted oval tubes is evaluated. The results show that the twisted wall induces secondary flow perpendicular to the mainstream direction. The vortices are rapidly generated in the pipe-line when the fluid enters the twisted tube section from the upstream section. As the fluid develops further, the vortices converge to form a spiral flow. Numerical simulations indicate that the average Nusselt number of twisted oval tube with a major/minor axes ratio of 1.70 increases by 18.7-35.5%, while the pressure drop increases by
KEYWORDS
Twisted oval tube, heat transfer, pressure drop, Integral thermal-hydraulic effectiveness
PAPER SUBMITTED: 2023-07-14
PAPER REVISED: 2023-10-31
PAPER ACCEPTED: 2023-11-14
PUBLISHED ONLINE: 2024-01-20
DOI REFERENCE: https://doi.org/10.2298/TSCI230925281D
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 4, PAGES [2817 - 2830]
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Numerical simulation of heat transfer and pressure drop characteristics in twisted oval tubes

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence