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In this paper, a novel configuration of the microchannel heat sink is proposed to obtain improved thermo-hydraulic performance. The proposed microchannel includes porous fins that form adjacent converging\u2013diverging channels. Three-dimensional steady laminar simulations were conducted to access the performance of this novel microchannel and compare it with the conventional parallel ones with porous and solid fins. The results showed that by using this novel design, a 9.75% decrease in pressure drop is observed when compared to conventional solid fin parallel microchannel. Also, the mean Nusselt number of the microchannel heat sink with converging\u2013diverging porous fins showed a maximum improvement of 16.5% compared to the parallel microchannel with solid fins. The overall thermo-hydraulic performance evaluation factor of the converging\u2013diverging microchannel showed also a significant 20% improvement compared to conventional designs. The analysis of the flow fields showed that the converging\u2013diverging design with porous fins leads to a local pressure difference between two adjacent neighboring channels inducing a cross-wise velocity component within the porous fins leading to enhanced thermal performance. Moreover, it was shown that only for converging\u2013diverging angles above 0.5 \u00b0, performance enhancement was observed compared with a microchannel with solid fins showing the existence of an optimum range for converging\u2013diverging angles. The response surface method was used to find the optimum range of fin porosity and converging\u2013diverging angle where the performance of the microchannel heat sink is maximum.<\/jats:p>","DOI":"10.1063\/5.0118700","type":"journal-article","created":{"date-parts":[[2022,10,6]],"date-time":"2022-10-06T05:05:32Z","timestamp":1665032732000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":31,"title":["Novel converging\u2013diverging microchannel heat sink with porous fins for combined thermo-hydraulic performance"],"prefix":"10.1063","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0654-4458","authenticated-orcid":false,"given":"Fatemeh","family":"Bagherighajari","sequence":"first","affiliation":[{"name":"Departamento de Engenharia Eletromec\u00e2nica, C-MAST\u2014Center for Mechanical and Aerospace Sciences and Technologies, Universidade da Beira Interior 1 , Covilh\u00e3, Portugal"},{"name":"Department of Mechanical Engineering, Mazandaran University of Science and Technology 2 , Babol, Iran"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9396-3855","authenticated-orcid":false,"given":"Mohammadmahdi","family":"Abdollahzadehsangroudi","sequence":"additional","affiliation":[{"name":"Departamento de Engenharia Eletromec\u00e2nica, C-MAST\u2014Center for Mechanical and Aerospace Sciences and Technologies, Universidade da Beira Interior 1 , Covilh\u00e3, Portugal"},{"name":"Faculty of Mechanical Engineering, University of Guilan 3 , Rasht, Iran"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9554-1832","authenticated-orcid":false,"given":"Mehdi","family":"Esmaeilpour","sequence":"additional","affiliation":[{"name":"Department of Mechanical and Industrial Engineering, College of Engineering and Computer Sciences, Marshall University 4 , Huntington, West Virginia 25755, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6388-3638","authenticated-orcid":false,"given":"Farid","family":"Dolati","sequence":"additional","affiliation":[{"name":"Faculty of Mechanical Engineering, University of Guilan 3 , Rasht, Iran"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7019-3766","authenticated-orcid":false,"given":"Jos\u00e9","family":"P\u00e1scoa","sequence":"additional","affiliation":[{"name":"Departamento de Engenharia Eletromec\u00e2nica, C-MAST\u2014Center for Mechanical and Aerospace Sciences and Technologies, Universidade da Beira Interior 1 , Covilh\u00e3, Portugal"}]}],"member":"317","published-online":{"date-parts":[[2022,11,3]]},"reference":[{"key":"2023080217052754000_c1","doi-asserted-by":"publisher","first-page":"126","DOI":"10.1109\/EDL.1981.25367","article-title":"High-performance heat sinking for VLSI","volume":"2","year":"1981","journal-title":"IEEE Electron Device Lett."},{"key":"2023080217052754000_c2","first-page":"145","article-title":"Ultrahigh thermal conductance microstructures for integrated circuits","year":"1982"},{"key":"2023080217052754000_c3","doi-asserted-by":"publisher","first-page":"2760","DOI":"10.1016\/j.ijheatmasstransfer.2010.02.022","article-title":"Fluid flow and heat transfer in wavy microchannels","volume":"53","year":"2010","journal-title":"Int. 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