1140 加振容器内二流体混合プロセスの可視化および PIV 計測

概要

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Two fluids mixing flow under alternating acceleration was investigated with a visualization and numerical analysis. The visualization was carried out with ink-dyed method, LIF method and LIF-PIV technique. The mixing process depending on the acceleration and amplitude of oscillation starts in a cubic test container with 50mm sides. As a test fluid, water and brine which density is 1.2g/(cm)^3,was used. The interface between water and brine is perturbed due to Rayleigh-Taylor instability. From the flow visualization, density waves were observed in the interface through the mixing process. Small perturbation was generated beside the wall of test section, and long wave-length of perturbation was developing. Finally the flow in the test section became chaotic. The equilibrium state of the mixing depends on the acceleration and frequency. PIV data shows the vortex structure in the mixing process. In the mixing process, it might be taken long time until the kinetic energy distributed to the high frequency of vortex structure. Numerical simulation shows the more quick mixing process than the experimental result.
2002-09-20