{"title":"Thermal-hydraulic performance analysis and multi-objective optimization of a microchannel with staggered semi-elliptical ribs","authors":"Pan Cui, Wei Liu, ZhiChun Liu","doi":"10.1007/s11431-023-2686-0","DOIUrl":null,"url":null,"abstract":"<p>To enhance the cooling capacity of traditional microchannels for high heat flux electronic devices, a microchannel design with staggered semi-elliptical ribs is proposed in this paper. Through numerical simulations, the flow characteristics of the designed microchannel are compared with those of a smooth one, and the effects of rib width (<i>W</i><sub>r</sub>), rib height (<i>H</i><sub>r</sub>), and rib length (<i>L</i><sub>r</sub>), on the thermal-hydraulic performance are investigated under laminar flow conditions. The results show that the periodically arranged ribs induce periodic vortices within the microchannel, effectively promoting fluid mixing and enhancing heat transfer. <i>W</i><sub>r</sub> and <i>H</i><sub>r</sub> have similar effects on microchannel performance, with an increase in them leading to an enhanced thermal performance at the expense of deteriorated hydraulic performance. Additionally, <i>L</i><sub>r</sub> has a comparatively weaker influence, with both the heat transfer and flow resistance initially growing with increasing <i>L</i><sub>r</sub> and then declining. To strike a balance between the two performances, a multi-objective optimization on the three geometrical parameters is conducted at a Reynolds number (<i>Re</i>) of 440. Combined with simulation data, artificial neural networks are trained as surrogate models, and a multi-objective genetic algorithm is employed to derive the Pareto front. Using the TOPSIS decision-making method, an optimal compromise solution is determined as <i>W</i><sub>r</sub> = 0.2415 mm, <i>H</i><sub>r</sub> = 0.0976 mm, and <i>L</i><sub>r</sub> = 0.6486 mm. Performance testing on the optimized microchannel reveals that it exhibits high heat transfer, middle flow resistance, and excellent overall performance, with the performance evaluation criterion (PEC) falling between 1.572 and 1.723 within the <i>Re</i> range of 220–660.</p>","PeriodicalId":21612,"journal":{"name":"Science China Technological Sciences","volume":"4 1","pages":""},"PeriodicalIF":4.4000,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Science China Technological Sciences","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s11431-023-2686-0","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
To enhance the cooling capacity of traditional microchannels for high heat flux electronic devices, a microchannel design with staggered semi-elliptical ribs is proposed in this paper. Through numerical simulations, the flow characteristics of the designed microchannel are compared with those of a smooth one, and the effects of rib width (Wr), rib height (Hr), and rib length (Lr), on the thermal-hydraulic performance are investigated under laminar flow conditions. The results show that the periodically arranged ribs induce periodic vortices within the microchannel, effectively promoting fluid mixing and enhancing heat transfer. Wr and Hr have similar effects on microchannel performance, with an increase in them leading to an enhanced thermal performance at the expense of deteriorated hydraulic performance. Additionally, Lr has a comparatively weaker influence, with both the heat transfer and flow resistance initially growing with increasing Lr and then declining. To strike a balance between the two performances, a multi-objective optimization on the three geometrical parameters is conducted at a Reynolds number (Re) of 440. Combined with simulation data, artificial neural networks are trained as surrogate models, and a multi-objective genetic algorithm is employed to derive the Pareto front. Using the TOPSIS decision-making method, an optimal compromise solution is determined as Wr = 0.2415 mm, Hr = 0.0976 mm, and Lr = 0.6486 mm. Performance testing on the optimized microchannel reveals that it exhibits high heat transfer, middle flow resistance, and excellent overall performance, with the performance evaluation criterion (PEC) falling between 1.572 and 1.723 within the Re range of 220–660.
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Science China Technological Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
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