| Research Abstract |
Investigation of micro-mechanism of flow fields becomes important in the research of environmental pollution, chemical reaction, micro-gravity devices, semiconductors, and biotechnology. Our group has been focussing on development of Particle Image Velocimetry (PIV) in order to elucidate the detailed structure of various type flows. In the period of the present project, three main advances have been achieved as follows.
Yamamoto developed brand new algorithm for PIV using Dellaunay tesselation particle tracking method, velocity gradient tensor particle tracking method, and Fuzzy logic based particle tracking method. Computation speed is much improved with revision of trackability in highly deformed flow field. Ohta succeeded in measuring micro-scale flow structure in the flow driven by surface tension, turbulent jet flow, and particulate flow. Resolution of PIV is evaluated by comparing the data with Laser Doppler Velocimeter, In-line Holographic PIV.Murai developed the application method of PIV to multiphase flows, and highly accurate post-processing algorithm for Particle Tracking Velocimetry. Microscopic structure of turbulence in bubbly flow could be captured by combination of PIV and the post-processing.
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