Abstract
Three-dimensional particle tracking velocimetry (3-D PTV) measurements with a two-camera system have been conducted for a turbulent water plane Couette flow with an oil droplet in order to understand the modification of shear-dominant turbulence by the droplet. The parameters of the stereogrammetry, which are crucial for calculating the spatial coordinate of tracer particles from 2-D images of two cameras, have been determined with a careful calibration. The experimental results show that the axial and wall-normal turbulence intensities and the turbulent kinetic energy are enhanced locally in the confluence regions where axial main flow over the interface meets the secondary flow along the interface in the wall-normal direction. The secondary flows were observed only around the equator of the droplet. The wall-normal and transverse turbulence intensities are found to increase in the region above the droplet. This is due to the change in the direction of the primary flow over the top of the droplet. The turbulence in the other region is attenuated mainly because of the attenuation of the generation and evolution of the coherent structure in the neighbourhood of the droplet.
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Yoshimichi Hagiwara: He received his B.Sc. (Eng) degree in mechanical engineering from Kyoto University in 1976, and his Dr. of Eng. in mechanical engineering from Kyoto University in 1982. He had worked for Kyoto University as an instructor and then an associate professor from 1981 to 1994. His research interests were annular and dispersed gas-liquid two-phase flows and heat transfer enhancement. He has worked for Kyoto Institute of Technology as a professor of the control of transport phenomena since 1994. His current research interests are transport phenomena of turbulent liquid-liquid dispersed multiphase flows, drag reduction and attenuation of thermal leakage in turbulent duct flows by adding polymers, and molecular-dynamics simulation of interfacial phenomena.
Masato Nishino: He received his B.Sc. (Eng) degree in mechanical engineering from Kyoto Institute of Technology in 1997 and his M.Sc. degree in mechanical engineering from Kyoto Institute of Technology in 1999. The present paper is mainly based on his Master thesis, in which he developed the 3-D PTV method and discussed the modification of turbulence in the water Couette flow due to the immiscible oil droplet. He has worked for Yanmar Diesel Engine Co., Ltd. since he finished Master Course.
Mitsuru Tanaka: He received his B.Sc. degree in physics from Kyoto University in 1990, and his Dr. of Sci. in Physics from Kyoto University in 1995. He has worked for Kyoto Institute of Technology as a Research Associate in mechanical engineering since then. His current research interests are the simulation on the diffusion of small heavy particles in turbulent flow, the structure and dynamics of homogeneous shear turbulence, and the turbulent Couette flow with immiscible droplets.
Shuji Sakamoto: He received his B.Sc. (Eng) degree in mechanical engineering from Kyoto Institute of Technology in 1999, and is a graduate student in Master Course of Graduate school in Kyoto Institute of Technology. For his Bachelor’s thesis, he studied the 3-D PTV method and the modification of turbulence in the water Couette flow due to the immiscible oil droplets by the collaboration with Mr. Nishino. He has been carrying out further refinement of the method during his Master course.
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Hagiwara, Y., Nishino, M., Tanaka, M. et al. 3-D PTV measurement on turbulence modification due to an oil droplet in a plane Couette water flow. J Vis 3, 101–113 (2000). https://doi.org/10.1007/BF03182403
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DOI: https://doi.org/10.1007/BF03182403