The Development of Pressure Difference Technique Using Three Dimensional Effect in a Horizontal Pipe

摘要

Wave-like gas-solid flow in a horizontal pipe has been investigated experimentally. The aim of the investigation was to develop a non-intrusive measuring technique for monitoring the transition from a dilute phase flow to wave-like flow and to measure the properties of wave-like flow. Two measuring techniques were used to observe the transition and to measure the wave properties. The first was a capacitance technique which measured, indirectly, the average mass in the pipe cross section. Based on the 3D effects of wave-like flow a simpler method for monitoring the waves and their properties was developed. This technique is based on the measurement of a pressure difference through a cross section of the pipeline. In order to understand the behaviour of the flow, pressure traces along the pipe line and the flow rates of the gas and solids were recorded. The pressure difference measurement though the pipe cross section exhibited a number of characteristics that were due to the three dimensional (3D) nature of the flow. Analysis of this measurement shows that both wave length and velocity can be determined. The experimental results obtained by the pressure difference technique have been compared to those of the capacitance measuring technique.