Simulation Study of Spiral Electrode Capacitance Sensor for Measuring Concentration of Gas-Solid Two-Phase Flow

摘要

Gas-sold two-phase flow is a typical and complex flow form in the natural world and the industrial process. The accurate measurement of the parameters is the key problem for improving the industry control quality and promoting enterprise economic benefit. Three-dimensional finite element simulation of spiral electrodes capacitance sensor was put up by ANSYS in this paper. The results from simulation show that spiral electrode capacitance sensor has an obvious advantage. The sensor has uniform sensing filled, and the capacitance value has nothing to do with flow pattern which is only related to solid concentration change. There is good linear correlation between capacitance value and solid concentration. Relationship graph between capacitance value and solid concentration was obtained by calculated. In addition, with the FEM the qualitative analyses to the effect of each structural parameter of the capacitance transducer on its capability were made. These can provide bases and supports for optimum design of this kind of sensors. Comparing with ECT, it is a simply and easy-implemented method of concentration measurement using spiral electrode capacitance sensor.