PARTICLE IMAGE VELOCIMETRY FOR GAS-LIQUID TWO-PHASE FLOWS

摘要

Several novel techniques of PIV including PTV and new results on gas-liquid two-phase flows are introduced in this invited lecture. Instead of Laser-based illumination in PIV, shallow focal imaging technique is available to capture the images of gas-liquid two-phase flows with high image quality and low cost. Multi-velocity field PIV extends conventional PIV to measure simultaneously the flow fields of the liquid phase and gas phase from single-camera images with a high accuracy. The inverse analysis technique makes it possible to estimate carrier liquid phase flow velocities from measurement data of dispersed bubble motion when the dispersion motion is measured with PIV. These techniques have wide practical application in industrial processes, such as micro-bubble drag reduction for ship, etc.