Research for finite element simulation of array capacitance sensor

In view of the safety problem caused by the bubble distribution in the reactor flow passage, in order to pay attention to the characteristics of water and bubble two-phase flow in the reactor channel, the design of the array structure capacitance sensor is proposed. The three-dimensional model of array capacitance sensors is established by COMSOL Multi-physics finite element simulation software. The simulation results show that bubbles change the distribution of electric field intensity. The relationship among the distance between the polar plates, the size of the bubble and the capacitance value is studied by controlling the variable method to parameterize the scanning bubble radius, the polar plate spacing and the width of the polar plate. The simulation results show that the capacitance values decrease with the increase of bubble radius. The capacitance values decrease obviously when the bubble radius is more than 0.5mm. The capacitance values decrease with the increase of electrode spacing, and 6mm has higher sensitivity as the electrode plate spacing of capacitance sensor. the capacitance values increase with the increase of electrode width, in the range of 3-7mm, the differences between the change of capacitance values with bubbles and without bubbles are obvious, the electrode width is 5.5mm according to the sensitivity requirements of sensors.