Numerical study on flow and heat transfer of a finned-tube heat exchanger with trapezoid vortex generators in CO2 lasers

Hui Liu; Xiang Yan; Jianbao Yue; Heng Zhao

doi:10.1117/12.2547623

18 December 2019 Numerical study on flow and heat transfer of a finned-tube heat exchanger with trapezoid vortex generators in CO₂ lasers

Hui Liu, Xiang Yan, Jianbao Yue, Heng Zhao

Author Affiliations +

Proceedings Volume 11333, AOPC 2019: Advanced Laser Materials and Laser Technology; 1133312 (2019) https://doi.org/10.1117/12.2547623
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

The high pressure loss and low heat transfer efficiency have been plaguing the development of high power fast axial-flow CO₂ laser. In order to solve this problem, a special longitudinal vortex generator (LVG), which contains two modified right-angled trapezoid wings and interrupt gap (TMRTW), was proposed. The performance of a single trapezoid winglet (STW) and TMRTW was discussed. Numerical study reveals that compared with STW, the TMRTW has better flow and heat transfer characteristics under the same initialization conditions. Further parametric study indicates that the TMRTW generates vortex. The intensity of this vortex is mainly present in central area. The downstream extension of this vortex is better than that of STW. Especially for the developing of boundary layers, this is beneficial. Hence, the performance of heat transfer for TMRTW is enhanced obviously with Re less than 1200. Compared with STW, the heat transfer for TMRTW is enhanced by 16% under the optimized structure size, with the pressure penalty almost the same.

Citation Download Citation

Hui Liu, Xiang Yan, Jianbao Yue, and Heng Zhao "Numerical study on flow and heat transfer of a finned-tube heat exchanger with trapezoid vortex generators in CO₂ lasers", Proc. SPIE 11333, AOPC 2019: Advanced Laser Materials and Laser Technology, 1133312 (18 December 2019); https://doi.org/10.1117/12.2547623

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