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Numerical study of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls
•Three-dimensional model for laminar flow and heat transfer characteristics.•Heat transfer performance for microchannel heat sink with offset ribs on sidewalls.•Nusselt number, friction factor and performance evaluation criteria have been shown. A numerical investigation has been carried out to exam...
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Published in: | Applied thermal engineering 2016-01, Vol.92, p.32-41 |
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container_title | Applied thermal engineering |
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creator | Chai, Lei Xia, Guo Dong Wang, Hua Sheng |
description | •Three-dimensional model for laminar flow and heat transfer characteristics.•Heat transfer performance for microchannel heat sink with offset ribs on sidewalls.•Nusselt number, friction factor and performance evaluation criteria have been shown.
A numerical investigation has been carried out to examine the characteristics of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls. The three-dimensional equations considering entrance effect, conjugate heat transfer, viscous heating and temperature-dependent properties are solved for the fluid flow and heat transfer in the microchannel heat sink. Five different shapes of offset ribs are designed, including rectangular, backward triangular, isosceles triangular, forward triangular and semicircular. Results show that the offset ribs result in significant heat transfer enhancement and higher pressure drop. Depending on the different offset ribs and Reynolds number (190 ≤ Re ≤ 838) studied in the present work, Nusselt number and friction factor for the microchannel heat sink with offset ribs are 1.42–1.95 and 1.93–4.57 times higher than those for the smooth one, leading to performance evaluation criteria of 1.02–1.48. Further, as a consequence of significant pressure drop, the microchannel heat sink with offset ribs gradually loses its advantage as an effective heat transfer enhancement method at higher Reynolds number. |
doi_str_mv | 10.1016/j.applthermaleng.2015.09.071 |
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A numerical investigation has been carried out to examine the characteristics of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls. The three-dimensional equations considering entrance effect, conjugate heat transfer, viscous heating and temperature-dependent properties are solved for the fluid flow and heat transfer in the microchannel heat sink. Five different shapes of offset ribs are designed, including rectangular, backward triangular, isosceles triangular, forward triangular and semicircular. Results show that the offset ribs result in significant heat transfer enhancement and higher pressure drop. Depending on the different offset ribs and Reynolds number (190 ≤ Re ≤ 838) studied in the present work, Nusselt number and friction factor for the microchannel heat sink with offset ribs are 1.42–1.95 and 1.93–4.57 times higher than those for the smooth one, leading to performance evaluation criteria of 1.02–1.48. Further, as a consequence of significant pressure drop, the microchannel heat sink with offset ribs gradually loses its advantage as an effective heat transfer enhancement method at higher Reynolds number.</description><identifier>ISSN: 1359-4311</identifier><identifier>DOI: 10.1016/j.applthermaleng.2015.09.071</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Computational fluid dynamics ; Fluid flow ; Heat sinks ; Heat transfer ; Laminar flow ; Microchannel heat sink ; Microchannels ; Offset ribs ; Offsets ; Pressure drop ; Ribs</subject><ispartof>Applied thermal engineering, 2016-01, Vol.92, p.32-41</ispartof><rights>2015</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c363t-eb3fa9714103e3b7c832e0ab9342a3df06df558492839b500036bec947e5b12c3</citedby><cites>FETCH-LOGICAL-c363t-eb3fa9714103e3b7c832e0ab9342a3df06df558492839b500036bec947e5b12c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958</link.rule.ids></links><search><creatorcontrib>Chai, Lei</creatorcontrib><creatorcontrib>Xia, Guo Dong</creatorcontrib><creatorcontrib>Wang, Hua Sheng</creatorcontrib><title>Numerical study of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls</title><title>Applied thermal engineering</title><description>•Three-dimensional model for laminar flow and heat transfer characteristics.•Heat transfer performance for microchannel heat sink with offset ribs on sidewalls.•Nusselt number, friction factor and performance evaluation criteria have been shown.
A numerical investigation has been carried out to examine the characteristics of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls. The three-dimensional equations considering entrance effect, conjugate heat transfer, viscous heating and temperature-dependent properties are solved for the fluid flow and heat transfer in the microchannel heat sink. Five different shapes of offset ribs are designed, including rectangular, backward triangular, isosceles triangular, forward triangular and semicircular. Results show that the offset ribs result in significant heat transfer enhancement and higher pressure drop. Depending on the different offset ribs and Reynolds number (190 ≤ Re ≤ 838) studied in the present work, Nusselt number and friction factor for the microchannel heat sink with offset ribs are 1.42–1.95 and 1.93–4.57 times higher than those for the smooth one, leading to performance evaluation criteria of 1.02–1.48. Further, as a consequence of significant pressure drop, the microchannel heat sink with offset ribs gradually loses its advantage as an effective heat transfer enhancement method at higher Reynolds number.</description><subject>Computational fluid dynamics</subject><subject>Fluid flow</subject><subject>Heat sinks</subject><subject>Heat transfer</subject><subject>Laminar flow</subject><subject>Microchannel heat sink</subject><subject>Microchannels</subject><subject>Offset ribs</subject><subject>Offsets</subject><subject>Pressure drop</subject><subject>Ribs</subject><issn>1359-4311</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqNkLtOwzAYhT2ARLm8gwcGlgRfcpVYUEUBqYIFZstxfhMXxwm2Q9W3J1VY2JjOcC7S-RC6piSlhBa3u1SOo40d-F5acB8pIzRPSZ2Skp6gFeV5nWSc0jN0HsKOEMqqMlsh8zL14I2SFoc4tQc8aGxlb5z0WNthj6VrcQcy4uilCxo8Ng73RvlBddI5sIsbjPvEexO7eUAHiNibJuDBzUYLe2ltuESnWtoAV796gd43D2_rp2T7-vi8vt8mihc8JtBwLeuSZpRw4E2pKs6AyKbmGZO81aRodZ5XWc0qXjc5IYQXDag6KyFvKFP8At0su6MfviYIUfQmKLBWOhimIGjF8qwqKkbn6N0Snd-E4EGL0Zte-oOgRBypip34S1UcqQpSi5nqXN8sdZjvfBvwIigDTkFrPKgo2sH8b-gHVRKM7g</recordid><startdate>20160105</startdate><enddate>20160105</enddate><creator>Chai, Lei</creator><creator>Xia, Guo Dong</creator><creator>Wang, Hua Sheng</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TB</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope></search><sort><creationdate>20160105</creationdate><title>Numerical study of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls</title><author>Chai, Lei ; Xia, Guo Dong ; Wang, Hua Sheng</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c363t-eb3fa9714103e3b7c832e0ab9342a3df06df558492839b500036bec947e5b12c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Computational fluid dynamics</topic><topic>Fluid flow</topic><topic>Heat sinks</topic><topic>Heat transfer</topic><topic>Laminar flow</topic><topic>Microchannel heat sink</topic><topic>Microchannels</topic><topic>Offset ribs</topic><topic>Offsets</topic><topic>Pressure drop</topic><topic>Ribs</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chai, Lei</creatorcontrib><creatorcontrib>Xia, Guo Dong</creatorcontrib><creatorcontrib>Wang, Hua Sheng</creatorcontrib><collection>CrossRef</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Applied thermal engineering</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chai, Lei</au><au>Xia, Guo Dong</au><au>Wang, Hua Sheng</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Numerical study of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls</atitle><jtitle>Applied thermal engineering</jtitle><date>2016-01-05</date><risdate>2016</risdate><volume>92</volume><spage>32</spage><epage>41</epage><pages>32-41</pages><issn>1359-4311</issn><notes>ObjectType-Article-1</notes><notes>SourceType-Scholarly Journals-1</notes><notes>ObjectType-Feature-2</notes><notes>content type line 23</notes><abstract>•Three-dimensional model for laminar flow and heat transfer characteristics.•Heat transfer performance for microchannel heat sink with offset ribs on sidewalls.•Nusselt number, friction factor and performance evaluation criteria have been shown.
A numerical investigation has been carried out to examine the characteristics of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls. The three-dimensional equations considering entrance effect, conjugate heat transfer, viscous heating and temperature-dependent properties are solved for the fluid flow and heat transfer in the microchannel heat sink. Five different shapes of offset ribs are designed, including rectangular, backward triangular, isosceles triangular, forward triangular and semicircular. Results show that the offset ribs result in significant heat transfer enhancement and higher pressure drop. Depending on the different offset ribs and Reynolds number (190 ≤ Re ≤ 838) studied in the present work, Nusselt number and friction factor for the microchannel heat sink with offset ribs are 1.42–1.95 and 1.93–4.57 times higher than those for the smooth one, leading to performance evaluation criteria of 1.02–1.48. Further, as a consequence of significant pressure drop, the microchannel heat sink with offset ribs gradually loses its advantage as an effective heat transfer enhancement method at higher Reynolds number.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.applthermaleng.2015.09.071</doi><tpages>10</tpages></addata></record> |
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source | Elsevier |
subjects | Computational fluid dynamics Fluid flow Heat sinks Heat transfer Laminar flow Microchannel heat sink Microchannels Offset ribs Offsets Pressure drop Ribs |
title | Numerical study of laminar flow and heat transfer in microchannel heat sink with offset ribs on sidewalls |
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