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Multi-Frequency Ultrasonic Measurements of Phase Fraction for Liquid-Solid Dispersions

The ultrasonic attenuation mechanism is dissimilar under different density contrast and particle sizes. For liquid-solid dispersions with large particle size and low density contrast, the multi-frequency ultrasonic measurements of phase fraction is established. By analyzing the ultrasonic attenuation response under different particle sizes, the phase fraction measurement for the liquid-solid dispersions of large particle size and low density contrast is realized with the attenuation mechanism. The numerical results of different ultrasonic attenuation mechanisms are compared, and the influence of attenuation mechanisms on the experimental results is discussed. Taking the millimeter-sized acrylic spheres as test samples, the experiments were carried out on single size and multiple sizes of dispersed phase under different phase fraction. The experimental results show that the measurement method based on the ultrasonic attenuation of 1-5MHz multi-frequency has a good discrimination for the particle size, and the measurement error of phase fraction is less than 4%, which can effectively achieve the measurement of phase fraction in the liquid-solid dispersions.