Abstract
A capacitance measurement system is developed for the measurement of gas-liquid two-phase flow in glass micro-pipes with inner diameters of 3.96, 2.65 and 1.56 mm, respectively. As a typical flow regime in a micro-pipe two-phase flow system, slug flow is chosen for this investigation. A capacitance sensor is designed and a high-resolution and high-speed capacitance measurement circuit is used to measure the small capacitance signals based on the differential sampling method. The performance and feasibility of the capacitance method are investigated and discussed. The capacitance signal is analyzed, which can reflect the voidage variation of two-phase flow. The gas slug velocity is determined through a cross-correlation technique using two identical capacitance sensors. The simulation and experimental results show that the presented capacitance measurement system is successful. Research work also verifies that the capacitance sensor is an effective method for the measurement of gas liquid two-phase flow parameters in micro-pipes.
Highlights
Two-phase flow systems widely exist in industrial process
More and more two-phase flow systems in micro-channel or mini-channel forms are appearing in chemical reactors, exchangers, cooling processes and many other systems
The study of the characteristics in such applications requires the measurement of two-phase flow parameters, including flow patterns, pressure, temperature, phase velocity and voidage, etc
Summary
Two-phase flow systems widely exist in industrial process. The parameter measurement of such systems is always one of the most important and difficult research topics [1,2]. More and more two-phase flow systems in micro-channel or mini-channel forms are appearing in chemical reactors, exchangers, cooling processes and many other systems. The study of the characteristics in such applications requires the measurement of two-phase flow parameters, including flow patterns, pressure, temperature, phase velocity and voidage, etc. The flow characteristics in small-scale pipes make the parameter measurement more difficult than in normal scale pipes, so what parameter measurement techniques can be applied and how to apply them in micro-pipe two-phase flow research becomes a critical problem
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