Numerical Study of Thermal and Resistance Characteristics in the Vortex-Enhanced Tube

Yiang Li, Wenzhi Cui (), Xuefeng Jiang, Longjian Li and Juanfang Liu
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Yiang Li: School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China
Wenzhi Cui: School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China
Xuefeng Jiang: School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China
Longjian Li: School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China
Juanfang Liu: School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China

Energies, 2024, vol. 18, issue 1, 1-17

Abstract: Heat transfer enhancement is always pursued in the industry to achieve high-performance and low-energy-consumption heat exchange devices and systems. For decades, various types of heat transfer-enhancing tubes with differing geometries and wall configurations have been developed. In this paper, the heat transfer and pressure drop characteristics of air inside an innovative heat transfer tube with regular wall dimples, namely a vortex-enhanced tube, which has a great application prospect in the gas–gas heat exchanger, are numerically studied with an experimentally validated model. The effects of the depth, axial pitch, and radial rotation angle of the dimple in the tube wall on the convective heat transfer coefficient and friction drag coefficient are comprehensively analyzed. Based on the Performance Evaluation Criteria (PEC) of the tubes, the optimal parameters of the vortex-enhanced tube are obtained. When Re ranges from 10,000 to 40,000, the comprehensive evaluation factor of the vortex-enhanced tube is 1.29 times higher than the smooth tube. Dimple pacing, dimple depth, and dimple helical angle of the optimal tube type are 8 mm, 6 mm, and 83°, respectively.

Keywords: the vortex-enhanced tube; enhanced heat transfer; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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