Volumetric 3-component velocimetry measurements of the flow around a Rushton turbine: A fluid dynamics video
K.V. Sharp, D.F. Hill, D. Troolin, G. Walters, W. Lai
TL;DR
This paper presents volumetric 3-component velocimetry measurements of the flow around a Rushton turbine, showcased through animations and images in a fluid dynamics video for the APS DFD meeting.
Contribution
It provides detailed 3D flow measurements around a Rushton turbine using volumetric velocimetry, illustrating complex flow structures.
Findings
Detailed 3D flow field around Rushton turbine
Visualization of flow structures via volumetric measurements
Enhanced understanding of turbine flow dynamics
Abstract
This article describes a video uploaded to the APS DFD Annual Meeting 2009 Gallery of Fluid Motion. The video contains both animations and still images from a three-dimensional volumetric velocimetry measurement set acquired in the flow around a Rushton turbine.
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Taxonomy
TopicsFluid Dynamics and Turbulent Flows
Volumetric 3-component velocimetry measurements of the flow around a Rushton turbine: A fluid dynamics video
Kendra Sharp, David Hill, Geoffrey Walters
Penn State University
University Park, PA, 16802, USA
Daniel Troolin and Wing Lai
TSI Incorporated
Shoreview, MN, 55126, USA
Abstract
Volumetric 3-component velocimetry measurements have been taken of the flow field near a Rushton turbine in a stirred tank reactor. This highly unsteady, three-dimensional flowfield is characterized by a strong radial jet, large tank-scale ring vortices, and small-scale blade tip vortices. Approximately 15,000 3d vectors were obtained in a cubic volume; these data offer the most comprehensive view to date of this flow field, especially since they are acquired at three Reynolds numbers (15,000, 107,000, and 137,000). The fluid dynamics video shows various animations and combinations of the velocity and vorticity data. The volumetric nature of the data enable tip vortex identification, vortex trajectory analysis, and calculation of vortex strength. In the video, three identification methods for the vortices are compared based on: the calculation of circumferential vorticity; the calculation of local pressure minima via an eigenvalue approach (‘’) ; and the calculation of swirling strength again via an eigenvalue approach (‘’). A ‘swirl strength’ criterion overall provides clearest identification of the tip vortices. The visualization of tip vortices up to 140 degrees past blade passage in the highest Reynolds number case is notable and has not previously been shown.
The associated video can be viewed in mpeg-2 format and mpeg-1 format. The related article currently appears in the online first section of Experiments in Fluids (2009), doi 10.1007/s00348-009-0711-9.