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Visualization of Shear Stress With Micro Imaging Chip and Discrete Wavelet Transform

[+] Author and Article Information
Motoaki Kimura, Masahiro Takei

Department of Mechanical Engineering, College of Science and Technology, Nihon University, 8 Kanda Surugadai 1-Chome, Chiyoda-ku, Tokyo 101-8308, Japan

Chih-Ming Ho

Mechanical and Aerospace Engineering Department, University of California, Los Angeles, CA 90095

Yoshifuru Saito

Department of Electrical and Electronic Engineering, College of Technology, Hosei University, 3-7-2 Kajino, Koganei, Tokyo 184-8584, Japan

Kiyoshi Horii

Shirayuri College, 1-25 Midorigaoka, Chiyoda-ku, Tokyo 101-8308, Japan

J. Fluids Eng 124(4), 1018-1024 (Dec 04, 2002) (7 pages) doi:10.1115/1.1516599 History: Received May 30, 2000; Revised May 29, 2002; Online December 04, 2002
Copyright © 2002 by ASME
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References

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Figures

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Shear stress distribution in spanwise direction (Re=6960)
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Relation between whole normalized shear stress and wavenumber on the time space
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Wave number spectrum of shear stress distribution in spanwise direction (Re=6960)
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Space frequency of 16th Daubechies
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Time frequency of 16th Daubechies
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Wavelets multiresolution in Re=6960
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Wavelets multiresolution in Re=12,180
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Wavelets multiresolution in Re=17,400
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Relation between wavelets level and representative frequency
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Surface shear stress imaging chip
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Schematic plan (a) and cross-sectional (b) views of the micro shear stress sensor
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Shear stress measured with the imaging chip; (a) Re=6960, (b) Re=12,180, (c) Re=17,400, (d) original data

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