Mr. Cheng Lu Profile

Cheng Lu

at Shandong Univ of Science And Technology

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Proceedings Article | 13 December 2021 Paper

Numerical analysis of heat transfer enhancement of helical tube with twisted tapes under one-side heating

Mei Qi, Wenyi Chen, Qingguang Chen, Cheng Lu, Xin Yao

Proceedings Volume 12127, 121272F (2021) https://doi.org/10.1117/12.2625348

KEYWORDS: Resistance, Numerical analysis, Turbulence, Thermal effects, Numerical simulations, Metals, Analytical research, Temperature metrology, Molecules, Spherical lenses

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In order to solve the problem of low heat transfer performance of helical tube under the condition of one-sided heating, twisted tapes in helical tube were built, and the enhanced heat transfer characteristics of the helical tube with twisted tapes were studied through numerical simulation. The result shows: The twisted tapes cause the gas in the helical tube to generate swirling flows in different directions, and divide the gas in the helical tube into different regions, and each region generates a vortex. The twisted tapes increase the gas friction coefficient and Nusselt number in the helical tube, and the helical tube with double twisted tapes has the largest gas friction coefficient and Nusselt number corresponding to the same Re number. Under low Re number, the performance evaluation criteria of the helical tube with double twisted tape are higher than that of the single twisted tape, but when the Re number is greater than 14,500, the performance evaluation criteria of the helical tube with single twisted tape is higher. After the twisted tapes were built in, the gas temperature in the helical tube rises. At low Re number, the gas temperature rise in the helical tube with double twisted tape is the highest. When the Re number is greater than 18500, the gas temperature rise in the helical tube with single twisted tape is the highest.

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