Laser reflection method for determination of shear stress in low density transitional flows
The details of laser reflection method (LRM) for the determination of shear stress in low density transitional flows are presented. The method is employed to determine the shear stress due to impingement of a low density supersonic free jet issuing out from a convergent divergent nozzle on a flat pl...
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| Veröffentlicht in: | Experiments in fluids 2006-03, Vol.40 (3), p.422-430 |
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| creator | SATHIAN, Sarith P KURIAN, Job |
| description | The details of laser reflection method (LRM) for the determination of shear stress in low density transitional flows are presented. The method is employed to determine the shear stress due to impingement of a low density supersonic free jet issuing out from a convergent divergent nozzle on a flat plate. The plate is smeared with a thin oil film and kept parallel to the nozzle axis. For a thin oil film moving under the action of aerodynamic boundary layer, the shear stress at the airaoil interface is equal to the shear stress between the surface and air. A direct and dynamic measurement of the oil film slope generated by the shear force is done using a position sensing detector (PSD). The thinning rate of the oil film is directly measured which is the major advantage of the LRM. From the oil film slope history, calculation of the shear stress is done using a three-point formula. The range of Knudsen numbers investigated is from 0.028 to 0.516. Pressure ratio across the nozzle varied from 3,500 to 8,500 giving highly under expanded free jets. The measured values of shear, in the overlapping region of experimental parameters, show fair agreement with those obtained by force balance method and laser interferometric method. |
| doi_str_mv | 10.1007/s00348-005-0079-4 |
| format | Article |
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The method is employed to determine the shear stress due to impingement of a low density supersonic free jet issuing out from a convergent divergent nozzle on a flat plate. The plate is smeared with a thin oil film and kept parallel to the nozzle axis. For a thin oil film moving under the action of aerodynamic boundary layer, the shear stress at the airaoil interface is equal to the shear stress between the surface and air. A direct and dynamic measurement of the oil film slope generated by the shear force is done using a position sensing detector (PSD). The thinning rate of the oil film is directly measured which is the major advantage of the LRM. From the oil film slope history, calculation of the shear stress is done using a three-point formula. The range of Knudsen numbers investigated is from 0.028 to 0.516. Pressure ratio across the nozzle varied from 3,500 to 8,500 giving highly under expanded free jets. The measured values of shear, in the overlapping region of experimental parameters, show fair agreement with those obtained by force balance method and laser interferometric method.</description><identifier>ISSN: 0723-4864</identifier><identifier>EISSN: 1432-1114</identifier><identifier>DOI: 10.1007/s00348-005-0079-4</identifier><identifier>CODEN: EXFLDU</identifier><language>eng</language><publisher>Heidelberg: Springer</publisher><subject>Density ; Divergent nozzles ; Exact sciences and technology ; Fluid dynamics ; Fundamental areas of phenomenology (including applications) ; Instrumentation for fluid dynamics ; Jets ; Lasers ; Nozzles ; Oil films ; Physics ; Rarefied gas dynamics ; Reflection ; Shear ; Shear stress ; Slip flows ; Turbulent flows, convection, and heat transfer</subject><ispartof>Experiments in fluids, 2006-03, Vol.40 (3), p.422-430</ispartof><rights>2006 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c359t-81a7a219d2bb65c5222966c5bd0673127b757c23890bb85943518b3c97ce460b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=17590039$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>SATHIAN, Sarith P</creatorcontrib><creatorcontrib>KURIAN, Job</creatorcontrib><title>Laser reflection method for determination of shear stress in low density transitional flows</title><title>Experiments in fluids</title><description>The details of laser reflection method (LRM) for the determination of shear stress in low density transitional flows are presented. The method is employed to determine the shear stress due to impingement of a low density supersonic free jet issuing out from a convergent divergent nozzle on a flat plate. The plate is smeared with a thin oil film and kept parallel to the nozzle axis. For a thin oil film moving under the action of aerodynamic boundary layer, the shear stress at the airaoil interface is equal to the shear stress between the surface and air. A direct and dynamic measurement of the oil film slope generated by the shear force is done using a position sensing detector (PSD). The thinning rate of the oil film is directly measured which is the major advantage of the LRM. From the oil film slope history, calculation of the shear stress is done using a three-point formula. The range of Knudsen numbers investigated is from 0.028 to 0.516. Pressure ratio across the nozzle varied from 3,500 to 8,500 giving highly under expanded free jets. The measured values of shear, in the overlapping region of experimental parameters, show fair agreement with those obtained by force balance method and laser interferometric method.</description><subject>Density</subject><subject>Divergent nozzles</subject><subject>Exact sciences and technology</subject><subject>Fluid dynamics</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>Instrumentation for fluid dynamics</subject><subject>Jets</subject><subject>Lasers</subject><subject>Nozzles</subject><subject>Oil films</subject><subject>Physics</subject><subject>Rarefied gas dynamics</subject><subject>Reflection</subject><subject>Shear</subject><subject>Shear stress</subject><subject>Slip flows</subject><subject>Turbulent flows, convection, and heat transfer</subject><issn>0723-4864</issn><issn>1432-1114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNqNkU1LAzEQhoMoWKs_wFsugpfVyXdylOIXFLzoyUPIplm6st2tmS3Sf29qBY_2MGRgnnkh8xByyeCGAZhbBBDSVgCqlHGVPCITJgWvGGPymEzAcFFJq-UpOUP8AGDKgZ2Q93nAlGlOTZfi2A49XaVxOSxoM2S6SGPKq7YPP4OhobhMIVMcc0KkbU-74atAPbbjlo457JpCho42ZYLn5KQJHaaL33dK3h7uX2dP1fzl8Xl2N6-iUG6sLAsmcOYWvK61iopz7rSOql6ANoJxUxtlIhfWQV1b5aRQzNYiOhOT1FCLKbne567z8LlJOPpVizF1XejTsEHPtORclSx3GCqNs-Z_VDEuuACtDkBBC8tkcTAlbI_GPCCWs_t1blchbz0DvzPp9yZ9Mel3Jr0sO1e_8QFj6Jpy6Nji36IpKqF87hureJxO</recordid><startdate>20060301</startdate><enddate>20060301</enddate><creator>SATHIAN, Sarith P</creator><creator>KURIAN, Job</creator><general>Springer</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><scope>7QH</scope><scope>7SP</scope><scope>7TB</scope><scope>7U5</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>KR7</scope><scope>L7M</scope></search><sort><creationdate>20060301</creationdate><title>Laser reflection method for determination of shear stress in low density transitional flows</title><author>SATHIAN, Sarith P ; KURIAN, Job</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c359t-81a7a219d2bb65c5222966c5bd0673127b757c23890bb85943518b3c97ce460b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>Density</topic><topic>Divergent nozzles</topic><topic>Exact sciences and technology</topic><topic>Fluid dynamics</topic><topic>Fundamental areas of phenomenology (including applications)</topic><topic>Instrumentation for fluid dynamics</topic><topic>Jets</topic><topic>Lasers</topic><topic>Nozzles</topic><topic>Oil films</topic><topic>Physics</topic><topic>Rarefied gas dynamics</topic><topic>Reflection</topic><topic>Shear</topic><topic>Shear stress</topic><topic>Slip flows</topic><topic>Turbulent flows, convection, and heat transfer</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>SATHIAN, Sarith P</creatorcontrib><creatorcontrib>KURIAN, Job</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Aqualine</collection><collection>Electronics & Communications Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Experiments in fluids</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>SATHIAN, Sarith P</au><au>KURIAN, Job</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Laser reflection method for determination of shear stress in low density transitional flows</atitle><jtitle>Experiments in fluids</jtitle><date>2006-03-01</date><risdate>2006</risdate><volume>40</volume><issue>3</issue><spage>422</spage><epage>430</epage><pages>422-430</pages><issn>0723-4864</issn><eissn>1432-1114</eissn><coden>EXFLDU</coden><abstract>The details of laser reflection method (LRM) for the determination of shear stress in low density transitional flows are presented. The method is employed to determine the shear stress due to impingement of a low density supersonic free jet issuing out from a convergent divergent nozzle on a flat plate. The plate is smeared with a thin oil film and kept parallel to the nozzle axis. For a thin oil film moving under the action of aerodynamic boundary layer, the shear stress at the airaoil interface is equal to the shear stress between the surface and air. A direct and dynamic measurement of the oil film slope generated by the shear force is done using a position sensing detector (PSD). The thinning rate of the oil film is directly measured which is the major advantage of the LRM. From the oil film slope history, calculation of the shear stress is done using a three-point formula. The range of Knudsen numbers investigated is from 0.028 to 0.516. Pressure ratio across the nozzle varied from 3,500 to 8,500 giving highly under expanded free jets. The measured values of shear, in the overlapping region of experimental parameters, show fair agreement with those obtained by force balance method and laser interferometric method.</abstract><cop>Heidelberg</cop><cop>Berlin</cop><pub>Springer</pub><doi>10.1007/s00348-005-0079-4</doi><tpages>9</tpages></addata></record> |
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| ispartof | Experiments in fluids, 2006-03, Vol.40 (3), p.422-430 |
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| language | eng |
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| subjects | Density Divergent nozzles Exact sciences and technology Fluid dynamics Fundamental areas of phenomenology (including applications) Instrumentation for fluid dynamics Jets Lasers Nozzles Oil films Physics Rarefied gas dynamics Reflection Shear Shear stress Slip flows Turbulent flows, convection, and heat transfer |
| title | Laser reflection method for determination of shear stress in low density transitional flows |
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