Effect of Guide Vane on Turbulence Characteristics for Single-Phase Flow through a 90-Degree Pipe Bend
The present study expresses the turbulent flow characteristics through a 90° pipe bend using a numerical method by determining the solutions for Reynolds Averaged Navier-Stokes (RANS) expression using the k-ω (SST) turbulence model. For that purpose, numerical analysis has been carried out by sol...
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| Veröffentlicht in: | Journal of applied fluid mechanics 2021-07, Vol.14 (4), p.1195 |
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| description | The present study expresses the turbulent flow characteristics through a 90° pipe bend using a numerical method by determining the solutions for Reynolds Averaged Navier-Stokes (RANS) expression using the k-ω (SST) turbulence model. For that purpose, numerical analysis has been carried out by solving RANS equations using ANSYS FLUENT 16.2, considering incompressible fluid in turbulent flow conditions. Simulations have been carried out for three different Reynolds number ranging from 1×105 to 10×105 at three different bend curvature ratios (Rc/D = 1, 1.5, and 2). Pipe bends with guide vane are generally used where flow separation and space problem makes an issue in mechanical design. The presence of guide vane inside the bend positively suppressed the flow separation and presence of cross-flow which can cause the engine to run off design, thus reducing the engine efficiency. So, to observe the effect of guide vane and its position on turbulence characteristics, four different positions of guide vane inside the bend are considered in the present study. At first, an analysis was led to make sure that the results obtained from the present numerical model are reliable and in line with previous results obtained from similar published experiments and numerical work. Research has been conducted to find out the impact of Reynolds number, bend curvature ratio and position of guide vane on different turbulence characteristics namely; turbulent kinetic energy, turbulent intensity, and wall shear stress at bend outlet position. In general, the turbulent intensity is found larger for the lower bend curvature ratio at the inner wall curvature side. Results for turbulent kinetic energy have similarities in results with turbulent intensity. Significantly, the wall shear stress represented a strong dependency on the circumferential angle at the bend outlet cross-section, and curvature ratio rather than Reynolds number and guide vane positions. |
| doi_str_mv | 10.47176/jafm.14.04.32148 |
| format | Article |
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For that purpose, numerical analysis has been carried out by solving RANS equations using ANSYS FLUENT 16.2, considering incompressible fluid in turbulent flow conditions. Simulations have been carried out for three different Reynolds number ranging from 1×105 to 10×105 at three different bend curvature ratios (Rc/D = 1, 1.5, and 2). Pipe bends with guide vane are generally used where flow separation and space problem makes an issue in mechanical design. The presence of guide vane inside the bend positively suppressed the flow separation and presence of cross-flow which can cause the engine to run off design, thus reducing the engine efficiency. So, to observe the effect of guide vane and its position on turbulence characteristics, four different positions of guide vane inside the bend are considered in the present study. At first, an analysis was led to make sure that the results obtained from the present numerical model are reliable and in line with previous results obtained from similar published experiments and numerical work. Research has been conducted to find out the impact of Reynolds number, bend curvature ratio and position of guide vane on different turbulence characteristics namely; turbulent kinetic energy, turbulent intensity, and wall shear stress at bend outlet position. In general, the turbulent intensity is found larger for the lower bend curvature ratio at the inner wall curvature side. Results for turbulent kinetic energy have similarities in results with turbulent intensity. Significantly, the wall shear stress represented a strong dependency on the circumferential angle at the bend outlet cross-section, and curvature ratio rather than Reynolds number and guide vane positions.</description><identifier>ISSN: 1735-3572</identifier><identifier>EISSN: 1735-3645</identifier><identifier>DOI: 10.47176/jafm.14.04.32148</identifier><language>eng</language><publisher>Isfahan: Isfahan University of Technology</publisher><subject>Computational fluid dynamics ; Cross flow ; Curvature ; Flow characteristics ; Flow separation ; Fluid flow ; Guide vanes ; Impact analysis ; Incompressible flow ; Incompressible fluids ; K-omega turbulence model ; Kinetic energy ; Mathematical models ; Numerical analysis ; Numerical methods ; Numerical models ; Pipe bends ; Reynolds averaged Navier-Stokes method ; Reynolds number ; Shear stress ; Single-phase flow ; Turbulence ; Turbulence models ; Turbulent flow ; Wall shear stresses</subject><ispartof>Journal of applied fluid mechanics, 2021-07, Vol.14 (4), p.1195</ispartof><rights>2021. This work is published under https://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). 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For that purpose, numerical analysis has been carried out by solving RANS equations using ANSYS FLUENT 16.2, considering incompressible fluid in turbulent flow conditions. Simulations have been carried out for three different Reynolds number ranging from 1×105 to 10×105 at three different bend curvature ratios (Rc/D = 1, 1.5, and 2). Pipe bends with guide vane are generally used where flow separation and space problem makes an issue in mechanical design. The presence of guide vane inside the bend positively suppressed the flow separation and presence of cross-flow which can cause the engine to run off design, thus reducing the engine efficiency. So, to observe the effect of guide vane and its position on turbulence characteristics, four different positions of guide vane inside the bend are considered in the present study. At first, an analysis was led to make sure that the results obtained from the present numerical model are reliable and in line with previous results obtained from similar published experiments and numerical work. Research has been conducted to find out the impact of Reynolds number, bend curvature ratio and position of guide vane on different turbulence characteristics namely; turbulent kinetic energy, turbulent intensity, and wall shear stress at bend outlet position. In general, the turbulent intensity is found larger for the lower bend curvature ratio at the inner wall curvature side. Results for turbulent kinetic energy have similarities in results with turbulent intensity. Significantly, the wall shear stress represented a strong dependency on the circumferential angle at the bend outlet cross-section, and curvature ratio rather than Reynolds number and guide vane positions.</description><subject>Computational fluid dynamics</subject><subject>Cross flow</subject><subject>Curvature</subject><subject>Flow characteristics</subject><subject>Flow separation</subject><subject>Fluid flow</subject><subject>Guide vanes</subject><subject>Impact analysis</subject><subject>Incompressible flow</subject><subject>Incompressible fluids</subject><subject>K-omega turbulence model</subject><subject>Kinetic energy</subject><subject>Mathematical models</subject><subject>Numerical analysis</subject><subject>Numerical methods</subject><subject>Numerical models</subject><subject>Pipe bends</subject><subject>Reynolds averaged Navier-Stokes method</subject><subject>Reynolds number</subject><subject>Shear stress</subject><subject>Single-phase flow</subject><subject>Turbulence</subject><subject>Turbulence models</subject><subject>Turbulent flow</subject><subject>Wall shear stresses</subject><issn>1735-3572</issn><issn>1735-3645</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNo1kN9LwzAcxIMoOOb-AN8CPrfmZ7M86tymMHDg9DWk6TdrR9fMpEX8792cPt3BHXfwQeiWklwoqor7nfX7nIqciJwzKqYXaEQVlxkvhLz891KxazRJqSmJEEpwrvQI-bn34HocPF4OTQX4w3aAQ4c3QyyHFjoHeFbbaF0PsUl94xL2IeK3ptu2kK1rmwAv2vCF-zqGYVtjizXJnmAbAfC6OQB-hK66QVfetgkmfzpG74v5ZvacrV6XL7OHVeYYk30mPClLJ7isRMm011p5KiUpNDChGJ16ZyUHXhJpvWSaEjhmnjldAYfKFXyM7s67hxg-B0i92YUhdsdLwynjasopPbXoueViSCmCN4fY7G38NpSYX6LmRNRQYYgwv0T5D4r_aOk</recordid><startdate>20210701</startdate><enddate>20210701</enddate><creator>Saha, S Kumar</creator><creator>Nandi, N</creator><general>Isfahan University of Technology</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7TB</scope><scope>7U5</scope><scope>7UA</scope><scope>8FD</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FR3</scope><scope>H8D</scope><scope>KR7</scope><scope>L7M</scope><scope>PHGZM</scope><scope>PHGZT</scope><scope>PIMPY</scope><scope>PKEHL</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope></search><sort><creationdate>20210701</creationdate><title>Effect of Guide Vane on Turbulence Characteristics for Single-Phase Flow through a 90-Degree Pipe Bend</title><author>Saha, S Kumar ; Nandi, N</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c225t-4f0bbc435d4b29f997f155069e247218fca53e3b05af52910e069f2c9de3edc63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Computational fluid dynamics</topic><topic>Cross flow</topic><topic>Curvature</topic><topic>Flow characteristics</topic><topic>Flow separation</topic><topic>Fluid flow</topic><topic>Guide vanes</topic><topic>Impact analysis</topic><topic>Incompressible flow</topic><topic>Incompressible fluids</topic><topic>K-omega turbulence model</topic><topic>Kinetic energy</topic><topic>Mathematical models</topic><topic>Numerical analysis</topic><topic>Numerical methods</topic><topic>Numerical models</topic><topic>Pipe bends</topic><topic>Reynolds averaged Navier-Stokes method</topic><topic>Reynolds number</topic><topic>Shear stress</topic><topic>Single-phase flow</topic><topic>Turbulence</topic><topic>Turbulence models</topic><topic>Turbulent flow</topic><topic>Wall shear stresses</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Saha, S Kumar</creatorcontrib><creatorcontrib>Nandi, N</creatorcontrib><collection>CrossRef</collection><collection>Aqualine</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Technology Research Database</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>ProQuest Central (New)</collection><collection>ProQuest One Academic (New)</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Middle East (New)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><jtitle>Journal of applied fluid mechanics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Saha, S Kumar</au><au>Nandi, N</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of Guide Vane on Turbulence Characteristics for Single-Phase Flow through a 90-Degree Pipe Bend</atitle><jtitle>Journal of applied fluid mechanics</jtitle><date>2021-07-01</date><risdate>2021</risdate><volume>14</volume><issue>4</issue><spage>1195</spage><pages>1195-</pages><issn>1735-3572</issn><eissn>1735-3645</eissn><abstract>The present study expresses the turbulent flow characteristics through a 90° pipe bend using a numerical method by determining the solutions for Reynolds Averaged Navier-Stokes (RANS) expression using the k-ω (SST) turbulence model. For that purpose, numerical analysis has been carried out by solving RANS equations using ANSYS FLUENT 16.2, considering incompressible fluid in turbulent flow conditions. Simulations have been carried out for three different Reynolds number ranging from 1×105 to 10×105 at three different bend curvature ratios (Rc/D = 1, 1.5, and 2). Pipe bends with guide vane are generally used where flow separation and space problem makes an issue in mechanical design. The presence of guide vane inside the bend positively suppressed the flow separation and presence of cross-flow which can cause the engine to run off design, thus reducing the engine efficiency. So, to observe the effect of guide vane and its position on turbulence characteristics, four different positions of guide vane inside the bend are considered in the present study. At first, an analysis was led to make sure that the results obtained from the present numerical model are reliable and in line with previous results obtained from similar published experiments and numerical work. Research has been conducted to find out the impact of Reynolds number, bend curvature ratio and position of guide vane on different turbulence characteristics namely; turbulent kinetic energy, turbulent intensity, and wall shear stress at bend outlet position. In general, the turbulent intensity is found larger for the lower bend curvature ratio at the inner wall curvature side. Results for turbulent kinetic energy have similarities in results with turbulent intensity. Significantly, the wall shear stress represented a strong dependency on the circumferential angle at the bend outlet cross-section, and curvature ratio rather than Reynolds number and guide vane positions.</abstract><cop>Isfahan</cop><pub>Isfahan University of Technology</pub><doi>10.47176/jafm.14.04.32148</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Computational fluid dynamics Cross flow Curvature Flow characteristics Flow separation Fluid flow Guide vanes Impact analysis Incompressible flow Incompressible fluids K-omega turbulence model Kinetic energy Mathematical models Numerical analysis Numerical methods Numerical models Pipe bends Reynolds averaged Navier-Stokes method Reynolds number Shear stress Single-phase flow Turbulence Turbulence models Turbulent flow Wall shear stresses |
| title | Effect of Guide Vane on Turbulence Characteristics for Single-Phase Flow through a 90-Degree Pipe Bend |
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