Free Convection in Asymmetrically Heated Vertical Channels With Opposing Buoyancy Forces
Laser interferometry and flow visualization were used to study free convective heat transfer inside a vertical channel. Most studies in the literature have investigated buoyancy forces in a single direction. The study presented here investigated opposing buoyancy forces, where one wall is warmer tha...
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| Veröffentlicht in: | Journal of heat transfer 2014-06, Vol.136 (6) |
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| creator | Roeleveld, D Naylor, D Leong, W. H |
| description | Laser interferometry and flow visualization were used to study free convective heat transfer inside a vertical channel. Most studies in the literature have investigated buoyancy forces in a single direction. The study presented here investigated opposing buoyancy forces, where one wall is warmer than the ambient and the other wall is cooler than the ambient. An experimental model of an isothermally, asymmetrically heated vertical channel was constructed. Interferometry provided temperature field visualization and flow visualization was used to obtain the streamlines. Experiments were carried out over a range of aspect ratios between 8.8 and 26.4, using temperature ratios of 0, −0.5, and −0.75. These conditions provide a modified Rayleigh number range of approximately 5 to 1100. In addition, the measured local and average Nusselt number data were compared to numerical solutions obtained using ANSYS FLUENT. Air was the fluid of interest. So the Prandtl number was fixed at 0.71. Numerical solutions were obtained for modified Rayleigh numbers ranging from the laminar fully developed flow regime to the turbulent isolated boundary layer regime. A semi-empirical correlation of the average Nusselt number was developed based on the experimental data. |
| doi_str_mv | 10.1115/1.4026218 |
| format | Article |
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H</creator><creatorcontrib>Roeleveld, D ; Naylor, D ; Leong, W. H</creatorcontrib><description>Laser interferometry and flow visualization were used to study free convective heat transfer inside a vertical channel. Most studies in the literature have investigated buoyancy forces in a single direction. The study presented here investigated opposing buoyancy forces, where one wall is warmer than the ambient and the other wall is cooler than the ambient. An experimental model of an isothermally, asymmetrically heated vertical channel was constructed. Interferometry provided temperature field visualization and flow visualization was used to obtain the streamlines. Experiments were carried out over a range of aspect ratios between 8.8 and 26.4, using temperature ratios of 0, −0.5, and −0.75. These conditions provide a modified Rayleigh number range of approximately 5 to 1100. In addition, the measured local and average Nusselt number data were compared to numerical solutions obtained using ANSYS FLUENT. Air was the fluid of interest. So the Prandtl number was fixed at 0.71. Numerical solutions were obtained for modified Rayleigh numbers ranging from the laminar fully developed flow regime to the turbulent isolated boundary layer regime. A semi-empirical correlation of the average Nusselt number was developed based on the experimental data.</description><identifier>ISSN: 0022-1481</identifier><identifier>EISSN: 1528-8943</identifier><identifier>DOI: 10.1115/1.4026218</identifier><identifier>CODEN: JHTRAO</identifier><language>eng</language><publisher>New York, NY: ASME</publisher><subject>Aerodynamics ; Buoyancy ; Channels ; Computational fluid dynamics ; Convection and heat transfer ; Exact sciences and technology ; Flows in ducts, channels, nozzles, and conduits ; Fluid dynamics ; Fluid flow ; Fundamental areas of phenomenology (including applications) ; Natural and Mixed Convection ; Physics ; Turbulence ; Turbulent flow ; Turbulent flows, convection, and heat transfer ; Walls</subject><ispartof>Journal of heat transfer, 2014-06, Vol.136 (6)</ispartof><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a312t-941292bbbaa03ff733bdbf7a4893c3daa2deb13c2fe64285fcd69e71ffde69603</citedby><cites>FETCH-LOGICAL-a312t-941292bbbaa03ff733bdbf7a4893c3daa2deb13c2fe64285fcd69e71ffde69603</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,777,781,27906,27907,38502</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=28569267$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Roeleveld, D</creatorcontrib><creatorcontrib>Naylor, D</creatorcontrib><creatorcontrib>Leong, W. H</creatorcontrib><title>Free Convection in Asymmetrically Heated Vertical Channels With Opposing Buoyancy Forces</title><title>Journal of heat transfer</title><addtitle>J. Heat Transfer</addtitle><description>Laser interferometry and flow visualization were used to study free convective heat transfer inside a vertical channel. Most studies in the literature have investigated buoyancy forces in a single direction. The study presented here investigated opposing buoyancy forces, where one wall is warmer than the ambient and the other wall is cooler than the ambient. An experimental model of an isothermally, asymmetrically heated vertical channel was constructed. Interferometry provided temperature field visualization and flow visualization was used to obtain the streamlines. Experiments were carried out over a range of aspect ratios between 8.8 and 26.4, using temperature ratios of 0, −0.5, and −0.75. These conditions provide a modified Rayleigh number range of approximately 5 to 1100. In addition, the measured local and average Nusselt number data were compared to numerical solutions obtained using ANSYS FLUENT. Air was the fluid of interest. So the Prandtl number was fixed at 0.71. Numerical solutions were obtained for modified Rayleigh numbers ranging from the laminar fully developed flow regime to the turbulent isolated boundary layer regime. A semi-empirical correlation of the average Nusselt number was developed based on the experimental data.</description><subject>Aerodynamics</subject><subject>Buoyancy</subject><subject>Channels</subject><subject>Computational fluid dynamics</subject><subject>Convection and heat transfer</subject><subject>Exact sciences and technology</subject><subject>Flows in ducts, channels, nozzles, and conduits</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>Natural and Mixed Convection</subject><subject>Physics</subject><subject>Turbulence</subject><subject>Turbulent flow</subject><subject>Turbulent flows, convection, and heat transfer</subject><subject>Walls</subject><issn>0022-1481</issn><issn>1528-8943</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNo9kE1LAzEQhoMoWKsHz15yEfSwNZPs57EuVoVCL37dQjY7sVt2k5pshf33bmnxNDA88zLPS8g1sBkAJA8wixlPOeQnZAIJz6O8iMUpmTDGeQRxDufkIoQNYyBEXEzI18Ij0tLZX9R94yxtLJ2Hoeuw941WbTvQF1Q91vQDfb_f0HKtrMU20M-mX9PVdutCY7_p484NyuqBLpzXGC7JmVFtwKvjnJL3xdNb-RItV8-v5XwZKQG8j4oYeMGrqlKKCWMyIaq6MpmK80JoUSvFa6xAaG4wjXmeGF2nBWZgTI1pkTIxJXeH3K13PzsMveyaoLFtlUW3CxKyjAnGxZg3JfcHVHsXgkcjt77plB8kMLlvT4I8tjeyt8dYFUZp40e1JvwfjJ-kBU-zkbs5cCp0KDdu5-1oK0XGkzgRf5cOeEE</recordid><startdate>20140601</startdate><enddate>20140601</enddate><creator>Roeleveld, D</creator><creator>Naylor, D</creator><creator>Leong, W. 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H</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a312t-941292bbbaa03ff733bdbf7a4893c3daa2deb13c2fe64285fcd69e71ffde69603</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Aerodynamics</topic><topic>Buoyancy</topic><topic>Channels</topic><topic>Computational fluid dynamics</topic><topic>Convection and heat transfer</topic><topic>Exact sciences and technology</topic><topic>Flows in ducts, channels, nozzles, and conduits</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Fundamental areas of phenomenology (including applications)</topic><topic>Natural and Mixed Convection</topic><topic>Physics</topic><topic>Turbulence</topic><topic>Turbulent flow</topic><topic>Turbulent flows, convection, and heat transfer</topic><topic>Walls</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Roeleveld, D</creatorcontrib><creatorcontrib>Naylor, D</creatorcontrib><creatorcontrib>Leong, W. 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Heat Transfer</stitle><date>2014-06-01</date><risdate>2014</risdate><volume>136</volume><issue>6</issue><issn>0022-1481</issn><eissn>1528-8943</eissn><coden>JHTRAO</coden><abstract>Laser interferometry and flow visualization were used to study free convective heat transfer inside a vertical channel. Most studies in the literature have investigated buoyancy forces in a single direction. The study presented here investigated opposing buoyancy forces, where one wall is warmer than the ambient and the other wall is cooler than the ambient. An experimental model of an isothermally, asymmetrically heated vertical channel was constructed. Interferometry provided temperature field visualization and flow visualization was used to obtain the streamlines. Experiments were carried out over a range of aspect ratios between 8.8 and 26.4, using temperature ratios of 0, −0.5, and −0.75. These conditions provide a modified Rayleigh number range of approximately 5 to 1100. In addition, the measured local and average Nusselt number data were compared to numerical solutions obtained using ANSYS FLUENT. Air was the fluid of interest. So the Prandtl number was fixed at 0.71. Numerical solutions were obtained for modified Rayleigh numbers ranging from the laminar fully developed flow regime to the turbulent isolated boundary layer regime. A semi-empirical correlation of the average Nusselt number was developed based on the experimental data.</abstract><cop>New York, NY</cop><pub>ASME</pub><doi>10.1115/1.4026218</doi></addata></record> |
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| subjects | Aerodynamics Buoyancy Channels Computational fluid dynamics Convection and heat transfer Exact sciences and technology Flows in ducts, channels, nozzles, and conduits Fluid dynamics Fluid flow Fundamental areas of phenomenology (including applications) Natural and Mixed Convection Physics Turbulence Turbulent flow Turbulent flows, convection, and heat transfer Walls |
| title | Free Convection in Asymmetrically Heated Vertical Channels With Opposing Buoyancy Forces |
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