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Stereoscopic Particle Image Velocimetry Investigation of Three-Dimensional Characteristics of vortex Structure in a Turbulent Channel Flow

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Chinese Physics Letters 2005年第3期22卷 624-627页

作者： Feng-ChenLI YasuoKAWAGUCHI TakehikoSEGAWA KoichiHISHIDA TurbomachineryGroup EnergyTechnologyResearchInstituteNationalInstituteofAdvancedIndustrialScienceandTechnology(AIST)Tsukuba305-8564Japan DepartmentofSystemDesignEngineering KeioUniversityYokohama223-8522Japan

We investigate the three-dimensional characteristics of turbulence structures in a turbulent channel flow by employing stereoscopic particle image velocimetry (SPIV). The SPIV measurement was performed for a water flow at the Reynolds number Re = 1.1 x 10(4) in both the streamwise-spanwise (x-z) and spanwise-wall-normal (z-y) planes, respectively. A three-dimensional image of the vortex tubes or the hairpin vortex leg(s) inclined toward the wall was obtained. A series of wall-normal vortex cores were found to align with the low-speed streaks with opposite vorticity signals at both sides of the streaks in the x-z plane, which were cross-section slices of the inclined hairpin vortex leg(s).

关键词： BOUNDARY-LAYERS channel flow low speed vortex core vortices Streak vortex tubes particle image velocimetry Stereoscopic boundary layer DIMENSIONAL PROPERTIES x-z Plane Stereo image processing Turbulent Flow Water flow

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Three and two dimensional compressible turbulent flow simulation in a vortex tube

Three and two dimensional compressible turbulent flow simula...

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International Conference on Intelligent Computational Systems(ICICS’2012);International Conference on Mechanical,Automotive and Materials Engineering(ICMAME’2012);International Conference on Electronics,Biomedical Engineering and its Applications(ICEBEA’2012);International Conference on Ecological,Environmental and Biological Sciences(ICEEBS’2012);International Conference on Business,Economics,Management and Behavioral Sciences (ICBEMBS’2012);International Conference on Applied Mathematics and Pharmaceutical Sciences(ICAMPS’2012)

作者： S.H.Azizi M.R.Andalibi P.Mohajeri Khameneh Department of Mechanical Engineering Young Researchers Club Bandar Lengeh Branch Islamic Azad University Department of Mechanical Engineering Bandar Lengeh Branch Islamic Azad University

In this paper, energy separation effect in a vortex tube has been investigated. Computational fluid dynamic model was used to predict the flow fields in vortex tube. The CFD model is steady axisymetric with high swirl that utilizes RANS techniques. In this paper we tried to find significant separation factor in a vortex tube with simulating energy separation phenomenon in 2D and 3D dimension cases. In 3D simulation a model with periodic boundary was considered. The curves （hot temperature separation, cold temperature separation, power separation） in 3D and 2D simulation are compared in different cold mass fractions with a given inlet mass flow rate. The results in 3D model are in reasonable agreement with experimental data.

关键词： Ranque-Hilsch vortex tube vortex tubes energy separation phenomenon cold mass fraction tangential work.

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