Numerical study of flow and heat transfer in the channel of panel-type radiator with semi-detached inclined trapezoidal wing vortex generators

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-01-19 DOI:10.1515/phys-2023-0180

Wenrong Si, Chenzhao Fu, Yue Tian, Jie Chen, Peng Yuan, Zexuan Huang, Jian Yang

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Abstract

To improve heat dissipation performance of panel-type radiator for transformer, this study investigated the flow and heat transfer characteristics of semi-detached inclined trapezoidal wing vortex generator (SDITW) in a closed channel on the air-side of the radiator. The SDITW was compared with the inclined delta wing (IDW) and inclined trapezoidal wing (ITW) channels. The effects of SDITW relative separation height (e 1/e 2), longitudinal pitch (p l), blockage ratio (e/(0.5H)), and inclination angle (α) were analyzed. First, compared with the IDW and ITW channels, the SDITW channel generates stable corner vortices and produces weaker transverse vortices and lower flow resistance due to the semi-detached structure of the wing. For Re = 5,125–15,375, the overall heat transfer performance (performance evaluation criteria; PEC) of the SDITW channel increases by 0.5–8.9 and 1.7–4.9% as compared with IDW and ITW channels, respectively. Furthermore, for the same e/(0.5H) and α, both the Nusselt number ratio and friction factor ratio of SDITW channel increase as e 1/e 2 and p l decrease. For p l = 70 mm, the SDITW channel exhibits a relatively better overall heat transfer performance. For the same e 1/e 2 and p l, the PEC of SDITW channel is maximum and the overall heat transfer performance is best when e/(0.5H) = 0.3 at Re = 10,250 and α = 30°–60°.

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带有半分离式倾斜梯形翼涡流发生器的板式散热器通道中的流动和传热数值研究

为改善变压器板式散热器的散热性能，本研究对散热器空气侧封闭通道中的半分离式倾斜梯形翼涡流发生器（SDITW）的流动和传热特性进行了研究。将 SDITW 与倾斜三角翼（IDW）和倾斜梯形翼（ITW）通道进行了比较。分析了 SDITW 相对分离高度（e 1/e 2）、纵向间距（p l）、阻塞比（e/(0.5H)）和倾角（α）的影响。首先，与 IDW 和 ITW 通道相比，SDITW 通道能产生稳定的角涡流，并且由于机翼的半分离结构，产生的横向涡流较弱，流动阻力较小。在 Re = 5,125-15,375 条件下，SDITW 通道的整体传热性能（性能评估标准；PEC）比 IDW 和 ITW 通道分别提高了 0.5-8.9% 和 1.7-4.9%。此外，在相同的 e/(0.5H) 和 α 条件下，随着 e 1/e 2 和 p l 的减小，SDITW 通道的努塞尔特数比和摩擦因数比都会增大。当 p l = 70 mm 时，SDITW 水道的整体传热性能相对较好。在相同的 e 1/e 2 和 p l 条件下，当 e/(0.5H) = 0.3（Re = 10,250 和 α = 30°-60°）时，SDITW 通道的 PEC 最大，整体传热性能最好。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.