悬移质溶液超声衰减分析及固相浓度反演

Ultrasonic attenuation analysis of suspended mass solution and inversion of solid phase concentration

基于McClements模型对悬移质两相流声传播进行分析,通过数值模拟探究了悬移质溶液中固相浓度、粒径以及超声频率对声衰减系数的影响作用,其中超声频率的0.5次幂、固相浓度分别与衰减系数呈现一次正相关,固相粒径与衰减系数则呈现一次负相关。分别得到3种因素单独影响下的拟合函数,并建立固相浓度的反演模型,该反演模型与McClements模型计算结果之间的相对误差小于2%。搭建了悬移质溶液衰减系数及浓度测量试验系统,进行了在粒径r=75μm,超声频率分别为700 kHz、1.1 MHz条件下的固相浓度测量实验,实验结果表明,基于反演模型推演所得浓度值与实际设定浓度之间的最大相对误差为11.2%(700 kHz)和9.6%(1.1 MHz)。所构建的反演模型可为悬移质浓度测量设备的研究提供一定的理论参考。

Based on the McClements model for the analysis of acoustic propagation in two-phase flow of suspended masses,the effects of solid phase concentration,particle size and ultrasonic frequency on the acoustic attenuation coefficient in suspended mass solutions are investigated by numerical simulation.Among them,the 0.5th power of ultrasonic frequency and the solid phase concentration have the positive correlation with the attenuation coefficient,respectively.The solid phase particle size and the attenuation coefficient have a negative correlation with the first order.The relative error between the inverse model and the McClements model is less than 2%.An experimental system is established to measure the attenuation coefficient and concentration of the suspension solution,and experiments are implemented to measure the solid-phase concentration under the conditions of particle size r=75μm and ultrasonic frequency of 700 kHz and 1.1 MHz,respectively.Experimental results show that the maximum relative error between the concentration values deduced from the inverse model and the actual set concentration is 11.2%(700 kHz)and 9.6%(1.1 MHz).The inverse model constructed in this article can provide some theoretical reference for the study of suspension concentration measurement equipment.