Recovery of Particle Concentration Fields by Two-Phase Flow Visualization around Bodies

Abstract

Measurement of the fields of particle concentration is one of the main task in research area of the two-phase flows around bodies in 'gas -solid particles' case. The paper considers the reconstruction of the concentration fields of solid particles by identifying their images. An experimental setup scheme for analysis of the structure of downward two-phase flow is presented. The main parameters of the experimental setup are as follows: geometry of the working area, air flow velocity, air flow rate, mass flow rate of particles. An optical monochrome setup for recording fast processes is briefly described. A method for processing experimental images based on the Canny edge detector is proposed. The processing algorithm for the experimental images was tested on glass microspheres used as a dispersed phase. The original image and a size distribution histogram for microstructures are presented. Examples of individual images of microspheres in a flow are considered for data validation. The experimental determination of the particle concentration fields in the downward flow and in the vicinity of the streamlined body are presented.