Anurag Maheswari , Yogesh K. Prajapati , Prabhakar Bhandari , Rajat Upadhyaya
{"title":"上下层鳍片配置不同的双层微通道散热器的实验分析","authors":"Anurag Maheswari , Yogesh K. Prajapati , Prabhakar Bhandari , Rajat Upadhyaya","doi":"10.1016/j.ijthermalsci.2024.109177","DOIUrl":null,"url":null,"abstract":"<div><p>In the present experimental study, two distinct configurations of double layer microchannel heat sinks (DL MCHS) are proposed. It consists of rectangular parallel channels in the bottom layer and an array of square pin fins in the upper layer. Pin fin height <span><math><mrow><mo>(</mo><msub><mi>H</mi><mi>f</mi></msub><mo>)</mo></mrow></math></span> in the first configuration is equals to the channel height (<span><math><mrow><msub><mi>H</mi><mi>c</mi></msub></mrow></math></span>) (i.e. <span><math><mrow><msub><mi>H</mi><mi>f</mi></msub><mo>/</mo><msub><mi>H</mi><mi>c</mi></msub><mo>=</mo><mn>1</mn></mrow></math></span>). However, in the second configuration, pin fin height is equivalent to 75 % of <span><math><mrow><msub><mi>H</mi><mi>c</mi></msub></mrow></math></span> such that <span><math><mrow><msub><mi>H</mi><mi>f</mi></msub><mo>/</mo><msub><mi>H</mi><mi>c</mi></msub><mo>=</mo><mn>0.75</mn></mrow></math></span>. The proposed modified DL MCHS configurations are then compared with the conventional double layer microchannel heat sink (CDL MCHS). Hence, the idea of the current work is to develop a novel DL MCHS with improved heat transfer capabilities and reduced pressure penalties. Heat dissipation rate, pressure data and coolant flow behaviour are carefully measured and analyzed. Findings reveal that thermal performance of the modified heat sink with <span><math><mrow><msub><mi>H</mi><mi>f</mi></msub><mo>/</mo><msub><mi>H</mi><mi>c</mi></msub><mo>=</mo><mn>1</mn></mrow></math></span> is not appreciable because it delivers almost similar to conventional configuration. Whereas, modified heat sink of <span><math><mrow><msub><mi>H</mi><mi>f</mi></msub><mo>/</mo><msub><mi>H</mi><mi>c</mi></msub><mo>=</mo><mn>0.75</mn></mrow></math></span> has consistently exhibited better heat transfer rate and thermal performance factor. As compared to CDL MCHS, thermal performance factor was found ≈38 % higher in this case. Overall thermal and hydraulic performance of the DL MCHS is significantly influenced by the flow pattern of the coolant, which is a result of the novel channel design.</p></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":4.9000,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental analysis of double layer microchannel heat sink with distinct fin configurations in upper and lower layers\",\"authors\":\"Anurag Maheswari , Yogesh K. Prajapati , Prabhakar Bhandari , Rajat Upadhyaya\",\"doi\":\"10.1016/j.ijthermalsci.2024.109177\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In the present experimental study, two distinct configurations of double layer microchannel heat sinks (DL MCHS) are proposed. It consists of rectangular parallel channels in the bottom layer and an array of square pin fins in the upper layer. Pin fin height <span><math><mrow><mo>(</mo><msub><mi>H</mi><mi>f</mi></msub><mo>)</mo></mrow></math></span> in the first configuration is equals to the channel height (<span><math><mrow><msub><mi>H</mi><mi>c</mi></msub></mrow></math></span>) (i.e. <span><math><mrow><msub><mi>H</mi><mi>f</mi></msub><mo>/</mo><msub><mi>H</mi><mi>c</mi></msub><mo>=</mo><mn>1</mn></mrow></math></span>). However, in the second configuration, pin fin height is equivalent to 75 % of <span><math><mrow><msub><mi>H</mi><mi>c</mi></msub></mrow></math></span> such that <span><math><mrow><msub><mi>H</mi><mi>f</mi></msub><mo>/</mo><msub><mi>H</mi><mi>c</mi></msub><mo>=</mo><mn>0.75</mn></mrow></math></span>. The proposed modified DL MCHS configurations are then compared with the conventional double layer microchannel heat sink (CDL MCHS). Hence, the idea of the current work is to develop a novel DL MCHS with improved heat transfer capabilities and reduced pressure penalties. Heat dissipation rate, pressure data and coolant flow behaviour are carefully measured and analyzed. Findings reveal that thermal performance of the modified heat sink with <span><math><mrow><msub><mi>H</mi><mi>f</mi></msub><mo>/</mo><msub><mi>H</mi><mi>c</mi></msub><mo>=</mo><mn>1</mn></mrow></math></span> is not appreciable because it delivers almost similar to conventional configuration. Whereas, modified heat sink of <span><math><mrow><msub><mi>H</mi><mi>f</mi></msub><mo>/</mo><msub><mi>H</mi><mi>c</mi></msub><mo>=</mo><mn>0.75</mn></mrow></math></span> has consistently exhibited better heat transfer rate and thermal performance factor. As compared to CDL MCHS, thermal performance factor was found ≈38 % higher in this case. Overall thermal and hydraulic performance of the DL MCHS is significantly influenced by the flow pattern of the coolant, which is a result of the novel channel design.</p></div>\",\"PeriodicalId\":341,\"journal\":{\"name\":\"International Journal of Thermal Sciences\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.9000,\"publicationDate\":\"2024-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Thermal Sciences\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1290072924002990\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Thermal Sciences","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1290072924002990","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Experimental analysis of double layer microchannel heat sink with distinct fin configurations in upper and lower layers
In the present experimental study, two distinct configurations of double layer microchannel heat sinks (DL MCHS) are proposed. It consists of rectangular parallel channels in the bottom layer and an array of square pin fins in the upper layer. Pin fin height in the first configuration is equals to the channel height () (i.e. ). However, in the second configuration, pin fin height is equivalent to 75 % of such that . The proposed modified DL MCHS configurations are then compared with the conventional double layer microchannel heat sink (CDL MCHS). Hence, the idea of the current work is to develop a novel DL MCHS with improved heat transfer capabilities and reduced pressure penalties. Heat dissipation rate, pressure data and coolant flow behaviour are carefully measured and analyzed. Findings reveal that thermal performance of the modified heat sink with is not appreciable because it delivers almost similar to conventional configuration. Whereas, modified heat sink of has consistently exhibited better heat transfer rate and thermal performance factor. As compared to CDL MCHS, thermal performance factor was found ≈38 % higher in this case. Overall thermal and hydraulic performance of the DL MCHS is significantly influenced by the flow pattern of the coolant, which is a result of the novel channel design.
期刊介绍:
The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review.
The fundamental subjects considered within the scope of the journal are:
* Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow
* Forced, natural or mixed convection in reactive or non-reactive media
* Single or multi–phase fluid flow with or without phase change
* Near–and far–field radiative heat transfer
* Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...)
* Multiscale modelling
The applied research topics include:
* Heat exchangers, heat pipes, cooling processes
* Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries)
* Nano–and micro–technology for energy, space, biosystems and devices
* Heat transport analysis in advanced systems
* Impact of energy–related processes on environment, and emerging energy systems
The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.