Natural convection in an enclosure with discrete roughness elements on a vertical heated wall
Natural convection flow next to a heated wall with single and repeated, two-dimensional, rectangular roughness elements is studied numerically and experimentally. The objective is to determine how these roughness elements influence heat transfer rates from the wall. Each roughness element consists o...
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| Veröffentlicht in: | International journal of heat and mass transfer 1988-07, Vol.31 (7), p.1423-1430 |
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| container_title | International journal of heat and mass transfer |
| container_volume | 31 |
| creator | SHAKERIN, S BOHN, M LOEHRKE, R. I |
| description | Natural convection flow next to a heated wall with single and repeated, two-dimensional, rectangular roughness elements is studied numerically and experimentally. The objective is to determine how these roughness elements influence heat transfer rates from the wall. Each roughness element consists of a thermally conducting, horizontal cylinder of rectangular cross section attached to the heated, isothermal wall of an enclosure. The height of roughness is on the order of the boundary layer thickness. Dye flow visualization in water confirms the numerical prediction that the steady flow over these elements does not separate. Only at high Rayleigh numbers, when the boundary layer below the roughness is unsteady, is local instantaneous flow reversal observed. Although steady flow reversals near the wall are not predicted or observed, nearly stagnant regions are formed, particularly between closely spaced cylinders. The surface heat flux in these stagnant regions is relatively low, so the total heat transfer rate may be nearly the same as for a smooth wall in spite of the increased surface area. |
| doi_str_mv | 10.1016/0017-9310(88)90251-7 |
| format | Article |
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Although steady flow reversals near the wall are not predicted or observed, nearly stagnant regions are formed, particularly between closely spaced cylinders. 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I</creatorcontrib><creatorcontrib>Colorado State Univ., Fort Collins (USA). Dept. of Mechanical Engineering</creatorcontrib><creatorcontrib>Solar Energy Research Inst., Golden, CO (USA)</creatorcontrib><title>Natural convection in an enclosure with discrete roughness elements on a vertical heated wall</title><title>International journal of heat and mass transfer</title><description>Natural convection flow next to a heated wall with single and repeated, two-dimensional, rectangular roughness elements is studied numerically and experimentally. The objective is to determine how these roughness elements influence heat transfer rates from the wall. Each roughness element consists of a thermally conducting, horizontal cylinder of rectangular cross section attached to the heated, isothermal wall of an enclosure. The height of roughness is on the order of the boundary layer thickness. Dye flow visualization in water confirms the numerical prediction that the steady flow over these elements does not separate. Only at high Rayleigh numbers, when the boundary layer below the roughness is unsteady, is local instantaneous flow reversal observed. Although steady flow reversals near the wall are not predicted or observed, nearly stagnant regions are formed, particularly between closely spaced cylinders. The surface heat flux in these stagnant regions is relatively low, so the total heat transfer rate may be nearly the same as for a smooth wall in spite of the increased surface area.</description><subject>140901 - Solar Thermal Utilization- Space Heating & Cooling</subject><subject>AIR FLOW</subject><subject>BUILDING TECHNOLOGIES</subject><subject>BUILDINGS</subject><subject>CONVECTION</subject><subject>ENERGY TRANSFER</subject><subject>Exact sciences and technology</subject><subject>FLOW VISUALIZATION</subject><subject>Fluid dynamics</subject><subject>FLUID FLOW</subject><subject>FLUX</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>GAS FLOW</subject><subject>HEAT FLUX</subject><subject>HEAT TRANSFER</subject><subject>HEAT TRANSFER RATE</subject><subject>Laminar flows</subject><subject>MASS TRANSFER</subject><subject>NATURAL CONVECTION</subject><subject>Physics</subject><subject>ROUGHNESS</subject><subject>SOLAR ENERGY</subject><subject>SURFACE PROPERTIES</subject><subject>TWO-DIMENSIONAL CALCULATIONS</subject><subject>WALL</subject><subject>WALLS</subject><issn>0017-9310</issn><issn>1879-2189</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1988</creationdate><recordtype>article</recordtype><recordid>eNo9kE9LAzEQxYMoWKvfwEMQD3pYzWySze5Riv-g6EWPEtLsrI1ssyVJW_z2Zq14GIYZ3u_Be4ScA7sBBtUtY6CKhgO7quvrhpUSCnVAJlCrpiihbg7J5F9yTE5i_BpPJqoJ-XgxaRNMT-3gt2iTGzx1nhpP0dt-iJuAdOfSkrYu2oAJaRg2n0uPMVLscYU-RZoZQ7cYkrPZaYkmYUt3pu9PyVFn-ohnf3tK3h_u32ZPxfz18Xl2Ny8sr1UqJDcdVtgIKE3F8o8L03W1gSoPcFNy0UmOC46iEQu74EKBkGWpVCtlK0o-JRd73yEmp6N1Ce0yJ_I5kZZKVSBlFom9yIYhxoCdXge3MuFbA9Njj3psRY8l6brWvz1qlbHLPbY2McfrgvHWxX9WAYBoGv4DFyJyrw</recordid><startdate>19880701</startdate><enddate>19880701</enddate><creator>SHAKERIN, S</creator><creator>BOHN, M</creator><creator>LOEHRKE, R. I</creator><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>OIOZB</scope><scope>OTOTI</scope></search><sort><creationdate>19880701</creationdate><title>Natural convection in an enclosure with discrete roughness elements on a vertical heated wall</title><author>SHAKERIN, S ; BOHN, M ; LOEHRKE, R. I</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c387t-53afe6e9412a60c3834aff8a168a113a234f53eb3e494bcb3471452277d55d423</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1988</creationdate><topic>140901 - Solar Thermal Utilization- Space Heating & Cooling</topic><topic>AIR FLOW</topic><topic>BUILDING TECHNOLOGIES</topic><topic>BUILDINGS</topic><topic>CONVECTION</topic><topic>ENERGY TRANSFER</topic><topic>Exact sciences and technology</topic><topic>FLOW VISUALIZATION</topic><topic>Fluid dynamics</topic><topic>FLUID FLOW</topic><topic>FLUX</topic><topic>Fundamental areas of phenomenology (including applications)</topic><topic>GAS FLOW</topic><topic>HEAT FLUX</topic><topic>HEAT TRANSFER</topic><topic>HEAT TRANSFER RATE</topic><topic>Laminar flows</topic><topic>MASS TRANSFER</topic><topic>NATURAL CONVECTION</topic><topic>Physics</topic><topic>ROUGHNESS</topic><topic>SOLAR ENERGY</topic><topic>SURFACE PROPERTIES</topic><topic>TWO-DIMENSIONAL CALCULATIONS</topic><topic>WALL</topic><topic>WALLS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>SHAKERIN, S</creatorcontrib><creatorcontrib>BOHN, M</creatorcontrib><creatorcontrib>LOEHRKE, R. I</creatorcontrib><creatorcontrib>Colorado State Univ., Fort Collins (USA). Dept. of Mechanical Engineering</creatorcontrib><creatorcontrib>Solar Energy Research Inst., Golden, CO (USA)</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>OSTI.GOV - Hybrid</collection><collection>OSTI.GOV</collection><jtitle>International journal of heat and mass transfer</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>SHAKERIN, S</au><au>BOHN, M</au><au>LOEHRKE, R. I</au><aucorp>Colorado State Univ., Fort Collins (USA). Dept. of Mechanical Engineering</aucorp><aucorp>Solar Energy Research Inst., Golden, CO (USA)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Natural convection in an enclosure with discrete roughness elements on a vertical heated wall</atitle><jtitle>International journal of heat and mass transfer</jtitle><date>1988-07-01</date><risdate>1988</risdate><volume>31</volume><issue>7</issue><spage>1423</spage><epage>1430</epage><pages>1423-1430</pages><issn>0017-9310</issn><eissn>1879-2189</eissn><coden>IJHMAK</coden><abstract>Natural convection flow next to a heated wall with single and repeated, two-dimensional, rectangular roughness elements is studied numerically and experimentally. The objective is to determine how these roughness elements influence heat transfer rates from the wall. Each roughness element consists of a thermally conducting, horizontal cylinder of rectangular cross section attached to the heated, isothermal wall of an enclosure. The height of roughness is on the order of the boundary layer thickness. Dye flow visualization in water confirms the numerical prediction that the steady flow over these elements does not separate. Only at high Rayleigh numbers, when the boundary layer below the roughness is unsteady, is local instantaneous flow reversal observed. Although steady flow reversals near the wall are not predicted or observed, nearly stagnant regions are formed, particularly between closely spaced cylinders. The surface heat flux in these stagnant regions is relatively low, so the total heat transfer rate may be nearly the same as for a smooth wall in spite of the increased surface area.</abstract><cop>Oxford</cop><pub>Elsevier</pub><doi>10.1016/0017-9310(88)90251-7</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
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| identifier | ISSN: 0017-9310 |
| ispartof | International journal of heat and mass transfer, 1988-07, Vol.31 (7), p.1423-1430 |
| issn | 0017-9310 1879-2189 |
| language | eng |
| recordid | cdi_osti_scitechconnect_5776155 |
| source | Elsevier ScienceDirect Journals |
| subjects | 140901 - Solar Thermal Utilization- Space Heating & Cooling AIR FLOW BUILDING TECHNOLOGIES BUILDINGS CONVECTION ENERGY TRANSFER Exact sciences and technology FLOW VISUALIZATION Fluid dynamics FLUID FLOW FLUX Fundamental areas of phenomenology (including applications) GAS FLOW HEAT FLUX HEAT TRANSFER HEAT TRANSFER RATE Laminar flows MASS TRANSFER NATURAL CONVECTION Physics ROUGHNESS SOLAR ENERGY SURFACE PROPERTIES TWO-DIMENSIONAL CALCULATIONS WALL WALLS |
| title | Natural convection in an enclosure with discrete roughness elements on a vertical heated wall |
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