Measurement of two phase flow concentration with a novel pressure difference method. I: Principle

Abstract

Traditionally, the measurement of the concentration of a two-phase flow by gauging differential pressure is subject to pressure loss due to the flow friction along the pipe wall. A novel pressure difference method against this issue was proposed in this paper. A theoretic model is developed for the method, from the principle of hydrostatics of particle gravitational settlement. The method was essentially validated with an experiment of particle settling in a stand-alone pipe section by sealing the two terminals to form a static gas-solid two phase medium and supported with a numerical simulation based on a Lagrangian model as well. Inherently, the method is expected to measure the concentration of a two phase flow in a pneumatic conveying pipe, correspondingly by setting a flow branch which contains an erect settlement tube with two dynamically shutting valves to form a transient static particle deposition segment.