Measurement Of The Void Fraction Of Gas-Liquid Two-Phase CO₂ Flow Using Laser Attenuation Techniques

Carbon capture and storage(CCS)is a promising technology to reduce CO2 emissions from industrial processes.However,void fraction measurement is one of the challenging issues to be solved for gas-liquid two-phase CO2 flow measurement.This paper presents a novel measurement system using laser intensity attenuation techniques to measure the void fraction of two-phase CO2 flow.The measurement system includes optical sensors,a laser detector array and a monolithic processor.The performance of the proposed measurement system is verified through experimental tests under various conditions,including stratified flow and bubbly flow.The void fraction of two-phase CO2 flow ranges from 1%to 69%.Experimental results demonstrate that the system is capable of measuring the void fraction of CO2 flow with an error between 2%and 3.6%.Also it is found that flow pattern of the stratified flow and the bubble flow and even flow rates could be identified by spectral analysis.It is indicated that laser intensity attenuation method is effective for the detection of void fraction of C02 gas-liquid two-phase flow.