Particle image velocimetry in single and multiphase flow

点击翻译按钮获取中文摘要

This research will advance our understanding of fundamental phenomena in two-phase, gas-liquid flows. These flows occur in many industrial processes where both a liquid and a vapour flow in a pipe at the same time. Examples are oil and gas facilities, boilers, steam generators, condensers, reheaters, distillation columns, and nuclear reactor cores. The primary flow regimes of interest in this work are slug flow and annular flow. Slug flow is characterised by slugs of liquid separated by elongated bubbles (called Taylor bubbles). Annular flow consists of liquid flowing on the pipe wall and a vapour flowing down the centre of the pipe. An understanding of these flows is important to allow this equipment to be properly designed and thereby minimise the energy consumption of processes involving two-phase flow. This work specifically aims to make fundamental measurements of the velocity field in these flows. This type of information is extremely valuable when attempting to improve the performance of equipment in these applications. For example, the velocity field is the quantity that ultimately determines how effectively a liquid transfers heat with a tube wall. It also determines the power required to pump the mixture through the pipe.