SUBMERSIBLE, PLANAR SHADOW IMAGE VELOCIMETRY SYSTEM FOR ONLINE, IN-SITU ANALYSIS OF MULTIPHASE FLOWS IN INDUSTRIAL PROCESSES

摘要

This paper describes a submersible, planar shadow image velocimetry system for investigations of multiphase flows in various industrial applications. Our objective is to visualize and monitor complex multiphase flows that take place in industrial process devices (e.g. reactors, channels, settling/flotation tanks) of chemical and paper industry. The presented submersible imaging system including laptop computer, CCD camera and pulsed, optical fiber-coupled diode laser is designed for industry-scale, in-situ, online measurements that study fluid dynamics and dispersed phase particle properties (velocity, size, shape, orientation and concentration). The system is successfully tested in a waste water dissolved air flotation (DAF) tank, in a white water de-aeration channel and in a plastic bead production reactor. Various improvements and modifications of the system are presented based on the test experiences.