PIV Study of the Turbulent Flow in a Stirred Vessel Equipped by an Eight Concave Blades Turbine
Bilel Ben Amira,
Zied Driss,
Mohamed Salah Abid
Issue:
Volume 1, Issue 2, September 2015
Pages:
5-10
Received:
17 August 2015
Accepted:
28 August 2015
Published:
2 September 2015
DOI:
10.11648/j.fm.20150102.11
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Abstract: The purpose of this study is to experimental investigating of the hydrodynamics structure in a cylindrical stirred vessel generated by an eight concave blades turbine. Particle image velocimetry (PIV) system was used to evaluate the effect of the blade turbine in the flow fields. The flow is illuminated by a Nd: YAG 532 nm green pulsed laser source generated in 2x30 mJ. The acquisition of the tow-dimensional images data was taken with a CCD camera with 1600 x 1200 pixels² of resolutions. In addition, a mini-synchronizer was used to control the different PIV components. For the results, we are interested to present the distribution of the velocity fields, the vorticity, the turbulent kinetic energy, the dissipation rate of the turbulent kinetic energy and the turbulent viscosity. Three azimuthally planes were carried out which present the turbine blade plane (θ=30°), the upstream turbine blade plane (θ=10°) and the downstream turbine blade plane (θ=45°).
Abstract: The purpose of this study is to experimental investigating of the hydrodynamics structure in a cylindrical stirred vessel generated by an eight concave blades turbine. Particle image velocimetry (PIV) system was used to evaluate the effect of the blade turbine in the flow fields. The flow is illuminated by a Nd: YAG 532 nm green pulsed laser source...
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The Influence of Wheel Spoiler Height on Vehicle Drag Reduction
Q. Jia,
M. M. Rashidi,
SB. Ju,
ZG. Yang
Issue:
Volume 1, Issue 2, September 2015
Pages:
11-17
Received:
29 August 2015
Accepted:
22 September 2015
Published:
28 September 2015
DOI:
10.11648/j.fm.20150102.12
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Views:
Abstract: Simplified vehicle has been applied in this paper to study the influence of wheel spoiler height on vehicle drag reduction. Two different conditions including stationary and rotating wheels were employed in numerical simulation with steady RANS (Reynolds Averaged Navier-Stokes) equations. Based on detailed analysis of flow around the wheels and integral curve of vehicle drag, it can be concluded that for both the stationary and rotating conditions, the drag decreased first and then increased as the spoiler height gets bigger. For front wheel spoiler, the optimal wheel spoiler height for stationary conditions lower than rotating one due to different drag reduction mechanism, so in wind tunnel test rotating condition was performed.
Abstract: Simplified vehicle has been applied in this paper to study the influence of wheel spoiler height on vehicle drag reduction. Two different conditions including stationary and rotating wheels were employed in numerical simulation with steady RANS (Reynolds Averaged Navier-Stokes) equations. Based on detailed analysis of flow around the wheels and int...
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