Experimental investigation of heat transfer augmentation of impinging jet solar air heater with stepped transverse ribs

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2024-10-29 DOI:10.1016/j.tsep.2024.103020

Chinmaya Mund, Sushil Kumar Rathore, Ranjit Kumar Sahoo

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Abstract

The current experimental investigation analyses the thermal and frictional attributes of an impinging jet solar air heater (IJSAH) with stepped transverse ribs, having varying pitch and size, affixed to the absorber plate. Two ribs of dimension 2 × 4 (R1) and 4 × 6 cm (R2) were tested. The pitch (p) between ribs was 2, 4, and 8 cm, with Reynolds number (Re) varying from 4913 to 13103. The jet hole diameter (Dj) considered were 3, 6 and 9 mm. The maximum Nusselt number (Nu) with the recommended R1 rib having p = 4 cm and Dj = 3 and 6 mm equalled 128.784 and 104.5004 at Re = 13103, respectively, which was 31.22 and 21.76 % higher than that generated by smooth IJSAH. The friction factor (f) generated by the ribbed IJSAH having Dj = 6 mm and p = 4 cm was 57.08 % lower than ribbed IJSAH with Dj = 3 mm. The peak thermohydraulic performance parameter (THPP) achieved was for R1 rib with p = 4 cm and Dj = 6 mm and equalled 1.75, which was 19.49 % higher than smooth IJSAH. The R1 rib with p = 4 cm at Re = 11465 demonstrated better thermal characteristics based on detailed investigation.

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带有阶梯式横向肋条的冲击喷射式太阳能空气加热器传热增效实验研究

目前的实验研究分析了带有阶梯式横向肋条的冲击喷射式太阳能空气加热器（IJSAH）的热属性和摩擦属性，这些肋条的间距和尺寸各不相同，并固定在吸收板上。测试了尺寸为 2 × 4（R1）和 4 × 6 厘米（R2）的两根肋条。肋条间距（p）分别为 2、4 和 8 厘米，雷诺数（Re）从 4913 到 13103 不等。喷射孔直径 (Dj) 分别为 3、6 和 9 毫米。在雷诺数为 13103 时，推荐的 R1 肋条（p = 4 厘米，Dj = 3 和 6 毫米）的最大努塞尔特数（Nu）分别为 128.784 和 104.5004，比光滑 IJSAH 产生的努塞尔特数分别高 31.22 和 21.76%。Dj = 6 毫米、p = 4 厘米的带肋 IJSAH 产生的摩擦因数（f）比 Dj = 3 毫米的带肋 IJSAH 低 57.08 %。P = 4 厘米、Dj = 6 毫米的 R1 肋的热液压性能参数（THPP）峰值为 1.75，比光滑的 IJSAH 高 19.49 %。根据详细调查，在 Re = 11465 条件下，p = 4 厘米的 R1 肋具有更好的热特性。

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.