Abstract
Velocity and density distributions of a high-speed and initial CO2 jet flow have been analyzed concurrently by a developed three-dimensional digital speckle tomography and a particle image velocimetry (PIV). Two high-speed cameras have been used for the tomography and one for the PIV since a shape of a nozzle for the jet flow is bilaterally symmetric and the starting flow is fast and unsteady. The speckle movements between no flow and CO2 jet flow have been obtained by a cross-correlation tracking method so that those distances can be transferred to deflection angles of laser rays for density gradients. The three-dimensional density fields for the high-speed CO2 jet flow have been reconstructed from the deflection angles by the real-time tomography method, and the two-dimensional velocity fields have been calculated by the PIV method concurrently and instantaneously.
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Yong-Jae Kim: He received his B.S., M.S. and Ph.D. degrees in School of Mechanical Engineering from Sungkyunkwan University, Suwon, Korea, in 2001, 2003 and 2009, respectively. He works in Intelligent System Research Center, Sungkyunkwan University, Korea, as a postdoctoral research associate. His research interests are flow visualization (tomography and PIV) and electrohydrodynamics jet (EHD jet).
Koji Okamoto: He received his M.Sc .(Eng) in Nuclear Engineering in 1985 from University of Tokyo. He also received his Ph.D. in Nuclear Engineering in 1992 from University of Tokyo. He worked in Department of Nuclear Engineering, Texas A & M University as a visiting associate professor in 1994. He works in Department of Human and Engineered Environmental Studies, University of Tokyo as a professor since 1993. His research interests are Quantitative Visualization, PIV, Holographic PIV Flow Induced Vibration and Thermal-hydraulics in Nuclear Power Plant.
Han Seo Ko: He received his M.S. and Ph.D..degrees in Mechanical Engineering in 1994 and 1998, respectively from Texas A&M University. After obtaining Ph.D., he worked as a research associate at Nuclear Engineering Research Laboratory, University of Tokyo. He also worked in Department of Mechanical Engineering, Johns Hopkins University as a visiting associate professor in 2007≈2008. He works in School of Mechanical Engineering, Sungkyunkwan University, Korea, as an associate professor since 2001. His current research interests are Flow Visualization, Microfluidics, Optical Tomography and Control of Micro-droplet Ejection.
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Kim, Y.J., Okamoto, K. & Ko, H.S. Study on concurrent measurements of velocity and density distributions for high-speed CO2 flow. J Vis 12, 203–215 (2009). https://doi.org/10.1007/BF03181859
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DOI: https://doi.org/10.1007/BF03181859