Phase-resolved PIV measurements of the flow between a pair of corotating disks in a cylindrical enclosure |
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| Affiliation: | 1. Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 106, ROC;2. Department of Management of Information System/Institute of Biomedical Engineering and Material Science, Chungtai Institute of Health Science and Technology, Taichung, Taiwan 406, ROC;1. Thermal Fluids Laboratory, National Kaohsiung Marine University, No. 142, Hai-Chuan Road, Nan-Tzu District, Kaohsiung, Post Code: 811, Taiwan, ROC;2. Department of Marine Engineering, National Kaohsiung Marine University, No. 142, Hai-Chuan Road, Nan-Tzu District, Kaohsiung, Post Code: 811, Taiwan, ROC;1. University of Ontario Institute of Technology, Oshawa, Ontario, Canada;2. McMaster University, Hamilton, Ontario, Canada;3. University of Guelph, Guelph, Ontario, Canada;1. School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, P.O. Box: 294 345, Dubai, United Arab Emirates;2. School of Civil Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom;1. Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;2. Department of Engineering, King Mongkut''s Institute of Technology Ladkrabang Chumphon Campus, Pathiu District, Chumphon 86160, Thailand;3. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand |
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| Abstract: | ![]()
This paper presents the measurements of the flow in the space between an enclosed corotating disk pair using particle image velocimetry (PIV) and laser doppler velocimetry (LDV). LDV gives the time history of velocity for time-domain analysis, while PIV provides the spatial distribution of the instantaneous velocity. A flow visualization technique displaying the concentration distribution of seeding particles was also employed to visualize the flow patterns. Experiments were conducted on the interdisk midplane with a Reynolds number of 5.25×105. Based on the LDV measured rotating frequency of the vortices around the hub, the phase-resolved PIV measurements were achieved, and a rotating reference coordinate system was employed to represent the flow patterns. The phase-resolved measurements reveal that the circumferential flow velocity oscillates periodically in both the inner and outer regions but in opposite trends. Based on the phase averaged data, the contributions of the periodic and random motions to the Reynolds stresses were evaluated, and the spatial distributions of the periodic Reynolds stresses were displayed. It is found that, the local rotation of the fluid induced by the deformation of the inner region contribute to a significant portion of the momentum transport. |
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