A colour PIV system employing fluorescent particles for two-phase flow measurements

Abstract

This paper describes a novel approach for separating the phases in a two-phase flow and measuring their velocity fields simultaneously. The method is an extension of two-colour particle image velocimetry and utilizes colour recording and fluorescently doped seed particles in one phase of the flow. This concept is developed into a number of practical optical recording systems. The simplest of these has been evaluated experimentally and some proof-of-principle results obtained. Image processing algorithms are employed to separate the particle images from each phase of the flow and between the first and second illumination pulse. The experimental data are presented from a laboratory flow rig consisting of two impinging jets.