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Low-speed streak and internal shear layer motions in a turbulent boundary layer
Institution:1. Division of Natural Medical Science, College of Health Science, Chosun University, Gwangju 501-759, Republic of Korea;2. Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 501-759, Republic of Korea;3. Department of Physiology and Biophysics, College of Medicine, Seoul National University, Seoul 110-799, Republic of Korea;4. Department of Physiology, Chonnam National University Medical School, Gwangju 501-757, Republic of Korea;5. Department of Physiology, College of Medicine, Chosun University, Gwangju 501-759, Republic of Korea;1. Department of Pediatrics, University of Massachusetts Medical School, Worcester, Massachusetts;2. Hyperpolarized Gas MRI Laboratory, Thunder Bay Regional Research Institute, Thunder Bay, Ontario, Canada;3. Department of Radiology, University of Massachusetts Medical School, Worcester, Massachusetts;4. Vertex Pharmaceuticals, Incorporated, Cambridge, Massachusetts;5. Department of Chemistry, Lakehead University, Thunder Bay, Ontario, Canada;1. Mechanical Engineering Department, Faculty of Engineering, Benha University, Benha, 13511 Qalyubia, Egypt;2. Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, 35516 El-Mansoura, Egypt;1. Department of Civil Engineering, Hongik University, Seoul 121-791, Republic of Korea;2. Department of Civil Engineering, CTRC, Inje University, Kimhae 621-749, Republic of Korea
Abstract:Some features of the inner region of a flat plate turbulent boundary layer are investigated by a Digital Particle Image Velocimetry technique. Measurements in planes parallel to the wall are examined. The energetic spanwise modes of the streaky motions are analysed by spatial Fourier analysis at different distances from the wall. Internal shear layers are deduced by applying VISA technique at y+=20 and detected events are ensemble averaged. The deduced flow structure highlights the dominant spatial relationship between low-speed streak and internal shear layer motions.
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