Combined laser-based measurements for dispersed two phase flows

This paper presents mainly a review of experimental study on the turbulent structure of dispersed two phase flow employing advanced laser techniques such as Shadow Doppler Velocimetry and Particle Image Velocimetry combined with Laser Induced Fluorescence. Shadow Doppler Velocimetry has been developed for particle sizing of arbitrary shaped particle, i.e. non spherical particle. For the bubbly flow, combined shadow image and DPIV techniques allow us to acquire the detailed information of two dimensional bubble motion and velocity vectors very close to the bubble. Microscale structures of turbulence associated with dispersed phase motion are certainly obtained by these Laser measurement techniques. Furthermore, PIV measurements in micro channel flow with sub-micron solid particles evaluated electroosmotic flow from particle motion in an applied electric field.