An ultrasound-based monitoring of kaolinite flocculent settling processes

作     者：Tian, Chang Zheng, Songlin Su, Mingxu 

作者机构：Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China 

出 版 物：《APPLIED ACOUSTICS》 (应用声学)

年 卷 期：2023年第203卷第1期

核心收录：

学科分类：07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China [51776129, 51676130] National Science and Technology Major Project of China [2017-V-0016- 0069] 

主　　题：Ultrasound Attenuation Particles flocculent settling Concentration 

摘      要：In order to implement real-time monitoring of flocculent settling processes, an ultrasonic method based on the ECAH model was proposed and studied, particularly by considering the influence of particle irreg-ularity on sound attenuation. Numerical simulations were conducted to evaluate the influence of critical physical parameters variation on the attenuation coefficient. Meanwhile, an integrated experimental system including ultrasonic measurement, interface settling velocity measurement, microscopic imaging and online sampling methods was established. The experiments of kaolinite particle suspensions with four different initial mass concentrations were carried out, and the phenomenon of flocculation and set-tling was observed accordingly. The duration of each settling stage and its change rate were analyzed simultaneously by both the interface settling velocity and ultrasonic attenuation coefficient. The analysis results show that for the same flocculent settling stage, the relative deviation of duration obtained by two methods above were 0%, 7.32%,-10.57%, 1.62% and 1.63%, respectively. The mechanisms and character-istics of each stage in the precipitation process were discussed in detail. At the same time, the volume concentrations obtained by ultrasonic method were compared with the results of weighing after on-line sampling. The deviations under the four initial mass concentrations were 18.6%, 12.1%, 11.0% and 13.2% respectively. The correlation between the process of flocculation and ultrasonic parameters was established accordingly, which provided data support for the application of ultrasonic technique to the online detection of kaolinite particle flocculent settling processes.(c) 2022 Elsevier Ltd. All rights reserved.