The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
H Babinsky - One of the best experts on this subject based on the ideXlab platform.
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corner Separation effects for normal shock wave turbulent boundary layer interactions in rectangular channels
Journal of Fluid Mechanics, 2012Co-Authors: D M F Burton, H BabinskyAbstract:Experiments are conducted to examine the mechanisms behind the coupling between corner Separation and Separation away from the corner when holding a high-Mach-number normal shock in a rectangular channel. The ensuing shock wave interaction with the boundary layer on the wind tunnel floor and in the corners was studied using laser Doppler anemometry, Pitot probe traverses, pressure sensitive paint and flow visualization. The primary mechanism explaining the link between the corner Separation Size and the other areas of Separation appears to be the generation of compression waves at the corner, which act to smear the adverse pressure gradient imposed upon other parts of the flow. Experimental results indicate that the alteration of the -region, which occurs in the supersonic portion of the shock wave/boundary layer interaction (SBLI), is more important than the generation of any blockage in the subsonic region downstream of the shock wave.
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Corner Separation effects for normal shock wave/turbulent boundary layer interactions in rectangular channels
Journal of Fluid Mechanics, 2012Co-Authors: D M F Burton, H BabinskyAbstract:Experiments are conducted to examine the mechanisms behind the coupling between corner Separation and Separation away from the corner when holding a high-Mach-number normal shock in a rectangular channel. The ensuing shock wave interaction with the boundary layer on the wind tunnel floor and in the corners was studied using laser Doppler anemometry, Pitot probe traverses, pressure sensitive paint and flow visualization. The primary mechanism explaining the link between the corner Separation Size and the other areas of Separation appears to be the generation of compression waves at the corner, which act to smear the adverse pressure gradient imposed upon other parts of the flow. Experimental results indicate that the alteration of the -region, which occurs in the supersonic portion of the shock wave/boundary layer interaction (SBLI), is more important than the generation of any blockage in the subsonic region downstream of the shock wave.
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Normal shock interactions in rectangular channels
50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012Co-Authors: D M F Burton, H BabinskyAbstract:Experiments have been conducted to examine the mechanisms behind the coupling between corner Separation and centreline Separation when holding a normal shock in a rectangular channel. The study has focused on a M ∞ = 1.5 normal shock held in a wind tunnel with a parallel rectangular cross-section. The primary mechanism explaining the link between the corner Separation Size and the centreline Separation appears to be the generation of compression waves which act to smear the adverse pressure gradient imposed upon other parts of the flow. In addition, the origin of the λ-foot leading leg appears to be depended upon the Size of the corner Separations. Experimental results indicate that the alteration of the λ-region, which occurs in the supersonic portion of the SBLI, is more important than the generation of any blockage in the subsonic region downstream of the shock wave. Copyright © 2012 by H. Babinsky, D.M.F. Burton.
D M F Burton - One of the best experts on this subject based on the ideXlab platform.
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corner Separation effects for normal shock wave turbulent boundary layer interactions in rectangular channels
Journal of Fluid Mechanics, 2012Co-Authors: D M F Burton, H BabinskyAbstract:Experiments are conducted to examine the mechanisms behind the coupling between corner Separation and Separation away from the corner when holding a high-Mach-number normal shock in a rectangular channel. The ensuing shock wave interaction with the boundary layer on the wind tunnel floor and in the corners was studied using laser Doppler anemometry, Pitot probe traverses, pressure sensitive paint and flow visualization. The primary mechanism explaining the link between the corner Separation Size and the other areas of Separation appears to be the generation of compression waves at the corner, which act to smear the adverse pressure gradient imposed upon other parts of the flow. Experimental results indicate that the alteration of the -region, which occurs in the supersonic portion of the shock wave/boundary layer interaction (SBLI), is more important than the generation of any blockage in the subsonic region downstream of the shock wave.
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Corner Separation effects for normal shock wave/turbulent boundary layer interactions in rectangular channels
Journal of Fluid Mechanics, 2012Co-Authors: D M F Burton, H BabinskyAbstract:Experiments are conducted to examine the mechanisms behind the coupling between corner Separation and Separation away from the corner when holding a high-Mach-number normal shock in a rectangular channel. The ensuing shock wave interaction with the boundary layer on the wind tunnel floor and in the corners was studied using laser Doppler anemometry, Pitot probe traverses, pressure sensitive paint and flow visualization. The primary mechanism explaining the link between the corner Separation Size and the other areas of Separation appears to be the generation of compression waves at the corner, which act to smear the adverse pressure gradient imposed upon other parts of the flow. Experimental results indicate that the alteration of the -region, which occurs in the supersonic portion of the shock wave/boundary layer interaction (SBLI), is more important than the generation of any blockage in the subsonic region downstream of the shock wave.
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Normal shock interactions in rectangular channels
50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012Co-Authors: D M F Burton, H BabinskyAbstract:Experiments have been conducted to examine the mechanisms behind the coupling between corner Separation and centreline Separation when holding a normal shock in a rectangular channel. The study has focused on a M ∞ = 1.5 normal shock held in a wind tunnel with a parallel rectangular cross-section. The primary mechanism explaining the link between the corner Separation Size and the centreline Separation appears to be the generation of compression waves which act to smear the adverse pressure gradient imposed upon other parts of the flow. In addition, the origin of the λ-foot leading leg appears to be depended upon the Size of the corner Separations. Experimental results indicate that the alteration of the λ-region, which occurs in the supersonic portion of the SBLI, is more important than the generation of any blockage in the subsonic region downstream of the shock wave. Copyright © 2012 by H. Babinsky, D.M.F. Burton.
Venkateswaran Narayanaswamy - One of the best experts on this subject based on the ideXlab platform.
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on the mean structure of sharp fin induced shock wave turbulent boundary layer interactions over a cylindrical surface
Journal of Fluid Mechanics, 2019Co-Authors: Joshua Pickles, Balachandra R Mettu, Pramod K Subbareddy, Venkateswaran NarayanaswamyAbstract:Interactions between an oblique shock wave generated by a sharp fin placed on a cylindrical surface and the incoming boundary layer are investigated to unravel the mean features of the resulting shock/boundary layer interaction (SBLI) unit. This fin-on-cylinder SBLI unit has several unique features caused by the three-dimensional (3-D) relief offered by the cylindrical surface that noticeably alter the shock structure. Complementary experimental and computational studies are made to delineate both the surface and off-body flow features of the fin-on-cylinder SBLI unit and to obtain a detailed understanding of the mechanisms that dictate the mean flow and wall pressure features of the SBLI unit. Results show that the fin-on-cylinder SBLI exhibits substantial deviation from quasi-conical symmetry that is observed in planar fin SBLI. Furthermore, the separated flow growth rate appears to decrease with downstream distance and the Separation Size is consistently smaller than the planar fin SBLI with the same inflow and fin configurations. The causes for the observed diminution of the separated flow and its downstream growth rate were investigated in the light of changes caused by the cylinder curvature on the inviscid as well as Separation shock. It was found that the inviscid shock gets progressively weakened in the region close to the triple point with downstream distance due to the 3-D relief effect from cylinder curvature. This weakening of the inviscid shock feeds into the Separation shock, which is also independently impacted by the 3-D relief, to result in the observed modifications in the fin-on-cylinder SBLI unit.
Yong Zhang - One of the best experts on this subject based on the ideXlab platform.
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Rotational Separation of non-spherical bioparticles using I-shaped pillar arrays in a microfluidic device
Nature communications, 2013Co-Authors: Kerwin Kwek Zeming, Shashi Ranjan, Yong ZhangAbstract:Most bioparticles, such as red blood cells and bacteria, are non-spherical in shape. However, conventional microfluidic Separation devices are designed for spherical particles. This poses a challenge in designing a Separation device for non-spherical bioparticles, as the smallest dimension of the bioparticle has to be considered, which increases fabrication challenges and decreases the throughput. If current methods do not take into account the shape of non-spherical bioparticles, the Separation will be inefficient. Here, to address this challenge, we present a novel technique for the Separation of red blood cells as a non-spherical bioparticle, using a new I-shaped pillar arrays design. It takes the shape into account and induces rotational movements, allowing us to leverage on the largest dimension, which increases its Separation Size. This technique has been used for 100% Separation of red blood cells from blood samples in a focused stream, outperforming the conventional pillar array designs.
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Rotational Separation of non-spherical bioparticles using I-shaped pillar arrays in a microfluidic device
Nature Communications, 2013Co-Authors: Kerwin Kwek Zeming, Shashi Ranjan, Yong ZhangAbstract:Most bioparticles, such as red blood cells and bacteria, are non-spherical in shape. However, conventional microfluidic Separation devices are designed for spherical particles. This poses a challenge in designing a Separation device for non-spherical bioparticles, as the smallest dimension of the bioparticle has to be considered, which increases fabrication challenges and decreases the throughput. If current methods do not take into account the shape of non-spherical bioparticles, the Separation will be inefficient. Here, to address this challenge, we present a novel technique for the Separation of red blood cells as a non-spherical bioparticle, using a new I-shaped pillar arrays design. It takes the shape into account and induces rotational movements, allowing us to leverage on the largest dimension, which increases its Separation Size. This technique has been used for 100% Separation of red blood cells from blood samples in a focused stream, outperforming the conventional pillar array designs. Microfluidic Separation devices are usually designed for spherical particles, but many biological particles are non-spherical; for example, red blood cells and bacteria. Using I-shaped pillar designs, Zhang et al . demonstrate a better sorting capability for non-spherical particles.
Joshua Pickles - One of the best experts on this subject based on the ideXlab platform.
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on the mean structure of sharp fin induced shock wave turbulent boundary layer interactions over a cylindrical surface
Journal of Fluid Mechanics, 2019Co-Authors: Joshua Pickles, Balachandra R Mettu, Pramod K Subbareddy, Venkateswaran NarayanaswamyAbstract:Interactions between an oblique shock wave generated by a sharp fin placed on a cylindrical surface and the incoming boundary layer are investigated to unravel the mean features of the resulting shock/boundary layer interaction (SBLI) unit. This fin-on-cylinder SBLI unit has several unique features caused by the three-dimensional (3-D) relief offered by the cylindrical surface that noticeably alter the shock structure. Complementary experimental and computational studies are made to delineate both the surface and off-body flow features of the fin-on-cylinder SBLI unit and to obtain a detailed understanding of the mechanisms that dictate the mean flow and wall pressure features of the SBLI unit. Results show that the fin-on-cylinder SBLI exhibits substantial deviation from quasi-conical symmetry that is observed in planar fin SBLI. Furthermore, the separated flow growth rate appears to decrease with downstream distance and the Separation Size is consistently smaller than the planar fin SBLI with the same inflow and fin configurations. The causes for the observed diminution of the separated flow and its downstream growth rate were investigated in the light of changes caused by the cylinder curvature on the inviscid as well as Separation shock. It was found that the inviscid shock gets progressively weakened in the region close to the triple point with downstream distance due to the 3-D relief effect from cylinder curvature. This weakening of the inviscid shock feeds into the Separation shock, which is also independently impacted by the 3-D relief, to result in the observed modifications in the fin-on-cylinder SBLI unit.
