Concentration determination in a cylinder-simulated gas–solid two phase flow using ultrasonic backscattering method

Abstract

Determining concentration in two phase flow is challenging, especially in gas–solid two phase flow. A novel ultrasonic backscattering method is proposed to determine the fixed cylinders concentration in gas phase in this paper. An ultrasonic reflection setup with two transducers, for transmitting and receiving, respectively, is built up. The appropriate ultrasonic frequency and particle size are selected for experiments to ensure effective backscattering intensity. Statistically analyzing the backscattering signal yields the product of attenuation coefficient and sound velocity, which is sensitive to the concentration. After the linear relationship between the product and concentration is obtained by the semi-empirical method, the concentration information can be inversely deduced after the received signals are measured experimentally. This method can provide a new strategy for the measurement of gas–solid two phase flow.