Application of ultrasound techniques in Solid-Liquid fluidized bed

This paper describes an application of ultrasound techniques to solid–liquid fluidized beds. The ultrasonic methods, experimental setups, and the signal processing for obtaining velocity profiles, particle size distribution, solids volume fraction are discussed. based on measurement attenuation coefficient, sound speed, frequency shift propagated wave. propagation speed in bed was measured be between 1504 m/s 1565 glass particles with fractions spanning from 27% 70% water. solid profiles were liquid superficial velocities varying 0.84 cm/s 4.24 cm/s. distributions four different sizes ranging 500 μm 1250 at a 35%. also reports importance as diagnostic tool investigate segregation behaviour beds fluidization conditions. results indicated that powerful can characterise real-time highly concentrated systems.