The entrainment behavior of a turbulent axisymmetric jet in a viscous host fluid
Although turbulent jets have been studied extensively, one configuration that has not received much attention is the viscosity-stratified jet, wherein a turbulent jet of lower viscosity issues into a density-matched host liquid of higher viscosity. We present experimental data for scalar dispersion...
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Veröffentlicht in: | Experiments in fluids 2005, Vol.38 (1), p.70-79 |
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description | Although turbulent jets have been studied extensively, one configuration that has not received much attention is the viscosity-stratified jet, wherein a turbulent jet of lower viscosity issues into a density-matched host liquid of higher viscosity. We present experimental data for scalar dispersion and two-dimensional velocity measurements in the axial plane of a turbulent axisymmetric jet with a Reynolds number (Re) of 2,000 issuing into a viscous host liquid at viscosity ratios (m) ranging from 1 to 55. The presence of a strong viscosity discontinuity across the jet edge results in a significant decrease in the scalar spread rate. We attribute this to the rapid reduction in turbulence intensity and the suppression of large engulfing eddies at the jet edge. The velocity profile, on the other hand, indicates that the velocity width and mass flux reduce with increasing m up to about 20, but then increase for higher values of m. This non-monotonic variation is explained by the growing influence of viscous stress for m>20. The scalar spread rate, the velocity spread rate, the centerline velocity decay rate, and the jet mass flux are all minimized for m?20 for Re=2,000. |
doi_str_mv | 10.1007/s00348-004-0888-x |
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We present experimental data for scalar dispersion and two-dimensional velocity measurements in the axial plane of a turbulent axisymmetric jet with a Reynolds number (Re) of 2,000 issuing into a viscous host liquid at viscosity ratios (m) ranging from 1 to 55. The presence of a strong viscosity discontinuity across the jet edge results in a significant decrease in the scalar spread rate. We attribute this to the rapid reduction in turbulence intensity and the suppression of large engulfing eddies at the jet edge. The velocity profile, on the other hand, indicates that the velocity width and mass flux reduce with increasing m up to about 20, but then increase for higher values of m. This non-monotonic variation is explained by the growing influence of viscous stress for m>20. 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We present experimental data for scalar dispersion and two-dimensional velocity measurements in the axial plane of a turbulent axisymmetric jet with a Reynolds number (Re) of 2,000 issuing into a viscous host liquid at viscosity ratios (m) ranging from 1 to 55. The presence of a strong viscosity discontinuity across the jet edge results in a significant decrease in the scalar spread rate. We attribute this to the rapid reduction in turbulence intensity and the suppression of large engulfing eddies at the jet edge. The velocity profile, on the other hand, indicates that the velocity width and mass flux reduce with increasing m up to about 20, but then increase for higher values of m. This non-monotonic variation is explained by the growing influence of viscous stress for m>20. The scalar spread rate, the velocity spread rate, the centerline velocity decay rate, and the jet mass flux are all minimized for m?20 for Re=2,000.</description><subject>Axisymmetric</subject><subject>Exact sciences and technology</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>Instrumentation for fluid dynamics</subject><subject>Jets</subject><subject>Marine</subject><subject>Physics</subject><subject>Scalars</subject><subject>Spreads</subject><subject>Turbulence</subject><subject>Turbulent flow</subject><subject>Turbulent flows, convection, and heat transfer</subject><subject>Viscosity</subject><issn>0723-4864</issn><issn>1432-1114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><recordid>eNqFkUtrWzEQhUVpoG6SH5CdNi3d3HRGmvvQspgmKRjSRbIWkixhhftwpXuN8-8j40B37Wpg5pzDYT7GbhBuEaD9ngEkdRUAVdB1XXX8wFZIUlSISB_ZClohK-oa-sQ-5_wCgLWCbsV-P-089-OcTByHMrn1O3OIU-JT4IbPS7JLf9qbY8yvw-DnFB1_8TOPY7kfYnbTkvluyjMP_RK3V-wimD776_d5yZ7vfj6tH6rN4_2v9Y9N5WQr5ooMqtDW1KhGWg_CCvJEwbpgrVNbCx6xxVADWtUECl1NCgJta-u9craWl-zrOXefpj-Lz7MeShff92b0pZEWClpqaizCb_8UYkNClM806v_SGoWUJNpTKp6lLk05Jx_0PsXBpFeNoE9E9JmILkT0iYg-Fs-X93iTnelDMqOL-a-xoQIMhHwDkTaLqg</recordid><startdate>2005</startdate><enddate>2005</enddate><creator>CHHABRA, Sudhaker</creator><creator>SHIPMAN, Thomas N</creator><creator>PRASAD, Ajay K</creator><general>Springer</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</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>2005</creationdate><title>The entrainment behavior of a turbulent axisymmetric jet in a viscous host fluid</title><author>CHHABRA, Sudhaker ; SHIPMAN, Thomas N ; PRASAD, Ajay K</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c372t-4a19f7546963be02b24e44fbcfbbc9db0e1171f501b96f4f85490f4d5bee9cb53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Axisymmetric</topic><topic>Exact sciences and technology</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Fundamental areas of phenomenology (including applications)</topic><topic>Instrumentation for fluid dynamics</topic><topic>Jets</topic><topic>Marine</topic><topic>Physics</topic><topic>Scalars</topic><topic>Spreads</topic><topic>Turbulence</topic><topic>Turbulent flow</topic><topic>Turbulent flows, convection, and heat transfer</topic><topic>Viscosity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>CHHABRA, Sudhaker</creatorcontrib><creatorcontrib>SHIPMAN, Thomas N</creatorcontrib><creatorcontrib>PRASAD, Ajay K</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aqualine</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>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>CHHABRA, Sudhaker</au><au>SHIPMAN, Thomas N</au><au>PRASAD, Ajay K</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The entrainment behavior of a turbulent axisymmetric jet in a viscous host fluid</atitle><jtitle>Experiments in fluids</jtitle><date>2005</date><risdate>2005</risdate><volume>38</volume><issue>1</issue><spage>70</spage><epage>79</epage><pages>70-79</pages><issn>0723-4864</issn><eissn>1432-1114</eissn><coden>EXFLDU</coden><abstract>Although turbulent jets have been studied extensively, one configuration that has not received much attention is the viscosity-stratified jet, wherein a turbulent jet of lower viscosity issues into a density-matched host liquid of higher viscosity. We present experimental data for scalar dispersion and two-dimensional velocity measurements in the axial plane of a turbulent axisymmetric jet with a Reynolds number (Re) of 2,000 issuing into a viscous host liquid at viscosity ratios (m) ranging from 1 to 55. The presence of a strong viscosity discontinuity across the jet edge results in a significant decrease in the scalar spread rate. We attribute this to the rapid reduction in turbulence intensity and the suppression of large engulfing eddies at the jet edge. The velocity profile, on the other hand, indicates that the velocity width and mass flux reduce with increasing m up to about 20, but then increase for higher values of m. This non-monotonic variation is explained by the growing influence of viscous stress for m>20. The scalar spread rate, the velocity spread rate, the centerline velocity decay rate, and the jet mass flux are all minimized for m?20 for Re=2,000.</abstract><cop>Heidelberg</cop><cop>Berlin</cop><pub>Springer</pub><doi>10.1007/s00348-004-0888-x</doi><tpages>10</tpages></addata></record> |
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subjects | Axisymmetric Exact sciences and technology Fluid dynamics Fluid flow Fundamental areas of phenomenology (including applications) Instrumentation for fluid dynamics Jets Marine Physics Scalars Spreads Turbulence Turbulent flow Turbulent flows, convection, and heat transfer Viscosity |
title | The entrainment behavior of a turbulent axisymmetric jet in a viscous host fluid |
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