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Study on Enhancement Effect of Cavitation Caused by HIFU Piezoelectricity Transducer

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稀有金属材料与工程 2006年第A3期35卷 527-529页

作者： Xinnan Fan Changping Zhu Shichuan He minglei shan Jiacai Chen Department of Computer ＆ Information Engineering Hohai University Changzhou 213022 China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China

An orthogonal ultrasonic irradiation system consisting of HIFU with frequency at 1.05 MHz combined with ultrasound with frequency at 28 kHz was applied in this *** of cavitation was detected by pH-value measurement and conductance *** result shows that the effect of cavitation caused by ultrasound with frequency at 28 kHz is greatly enhanced by HIFU piezoelectricity transducer with frequency at 1.05 MHz.

关键词： HIFU piezoelectricity transducer enhanced cavitation effect orthogonal ultrasonic irradiation

Wireless environmental monitoring system for transformer substation based on acoustic sensor

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High Technology Letters 2012年第4期18卷 394-400页

作者：朱昌平 Huang Yon.gliang shan minglei Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai University Changzhou 213022 P. R. China

In this paper, an indoor environmental monitoring solution is proposed for the transformer substation system by using the ZigBee technology. It mainly analyzes the principle of sulfur hexafluoride sensor based on the acoustic method and puts forward a difference data processing method of single-channel and temperature compensation point at power consumption issues for sensor detection. The method not only reduces the sensor power consumption, but also ensures the accuracy and extends the lifetime of wireless sensor nodes effectively. This paper also analyzes the design of the base station mode, and demonstrates the running processes of routers and sensors. The feasibility of the proposed approach has been testified and proved. Copyright © by HIGH TECHNOLOGY LETTERS PRESS.

关键词：环境监测系统声学传感器无线变电站 ZigBee技术室内环境监测数据处理方法传感器检测

A Precise Sensor for SF_6 Based on Piezoelectric Ultrasound

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稀有金属材料与工程 2006年第A3期35卷 157-158页

作者： Changping Zhu minglei shan Hongping Zhang Xiaohua Zhang Peng Zhen Yuanyun Tao Department of Computer ＆ Information Engineering Hohai University Changzhou 210032 China State Key Laboratory of Hydrology-water Resources And Hydraulic Engineering Hohai University Nanjing 210098 China Data Division of ZTE Corporation Nanjing 210012 China East China University of Science ＆ Technology Shanghai 200237 China

Based on piezoelectric ultrasound technology,the paper theoretically analyses the determination of gas concentration and presents a norm-contrast method,which is realized by high-speed chip CPLD (Complex programmable logic device),to determine the concentration of SF_6 accurately with air as *** is proved that this sensor can determine the concentration of SF_6 with the precision of 50μg/*** sensor is in the process of producing.

关键词： ultrasound detection gas concentration CPLD

Study on the concentrated SF_6 quantitative intelligent ultrasonic detection system

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High Technology Letters 2010年第4期16卷 378-382页

作者：朱昌平 Bian Mangxi shan minglei Yin Dongmei Yu Hongzhen College of Information and Electrical Engineering China University of Mining and Technology Xuzhou 221008 P.R. China Department of Computer ＆ Information Engineering Hohai University Changzhou 213022 P.R. China

In order to realize on-line quantitative detection on SF_6 and effective control of running state of SF_6high voltage power supply system,a concentrated SF_6 quantitative ultrasonic on-line detection system hasbeen developed based on the actual demand of electric power system *** are four majorcharacteristics in this ***,the gas of maximum 64 detection points is transferred through thespecific air path to the detection devices to be detected and analyzed,thereby the electrical lines and thecomplicated installation of the collectors can be avoided;secondly,the differential technique is used toshield the influence of environmental factors,which effectively improves the accuracy of the acoustic detection ;thirdly,the SF_6 concentration is determined by the speed and phase in the ultrasonic wave transmissionprocess,therefore there is no secondary pollution for the purely physical means;finally,the matureembedded technique is applied in this system to improve its intelligence and stability.

关键词：定量检测系统 SF6气体超声波智能高压供电系统应用系统嵌入式技术需求状况

Interface wave propagation characteristics of liquid-immersed porous cylinder

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Chinese Journal of Acoustics 2018年第2期37卷 177-190页

作者： HAN Qingbang XU Zhouchen TONG Ziwei QI Lihua WANG Peng shan minglei ZHU Changping College of IOT Engineering of Hohai University

This paper devotes to investigate the propagation characteristics of the interface wave on the liquid-immersed porous cylinder, and special emphasis is paid on the dependence of the dispersion relation on the porous media parameters. A model of liquid-immersed porous cylinder is established theoretically. Based on the elastic-dynamic theory of liquid-saturated porous solid and wave theory, the dispersion curves and transient response of open-pores and sealed-pores are simulated numerically, and their dependence on the cylinder radius and porous medium parameters are analyzed. The results show that the Stoneley-Scholte wave can be clearly distinguished with other waves in the time domain, and the Stoneley-Scholte wave dispersion relates intimately with the porosity of the porous medium and cylinder radius, whilst the permeability of the media has little effect on the dispersion property.

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Time difference based measurement of ultrasonic cavitations in wastewater treatment

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High Technology Letters 2016年第1期22卷 63-66页

作者：朱昌平 Wang Bin Liu Changwei Gong Runhang Liu Jing Ren Qinggong Han Qingbang Huang Bo shan minglei Tang Yibin Ni Caihua Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Changzhou Key Laboratory of Sensor Networks and Environmental Sensing Hohai University Changzhou 213022 P. R. China School of Petrochemical Engineering Changzhou University Changzhou 213164 P. R. China School of Chemical and Material Engineering Jiangnan University Wuxi 214122 P. R. China

Intensity of cavitation is significant in ultrasonic wastewater treatment,but is complicated to measure.A time difference based method of ultrasonic cavitation measurement is *** time differences at different powers of 495 kHz ultrasonic are measured in experiment in comparison with conductimetric *** results show that time difference and electrical conductivity are both approximately positive proportional to the ultrasonic *** degradation of PNP solution verifies the availability in wastewater treatment by using ultrasonic.

关键词：测量时间废水处理超声波空化作用超声空化效应污水处理测量方法对比试验

Investigation of cavitation bubble collapse in hydrophobic concave using the pseudopotential multi-relaxation-time lattice Boltzmann method

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Chinese Physics B 2021年第4期30卷 333-341页

作者：单鸣雷杨雨赵雪梦韩庆邦姚澄 Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai UniversityChangzhou 213022China College of Computer and Information Hohai UniversityNanjing 210000China

The interaction between cavitation bubble and solid surface is a fundamental topic which is deeply concerned for the utilization or avoidance of cavitation *** complexity of this topic is that the cavitation bubble collapse includes many extreme physical phenomena and variability of different solid surface *** the present work,the cavitation bubble collapse in hydrophobic concave is studied using the pseudopotential multi-relaxation-time lattice Boltzmann model(MRT-LB).The model is modified by involving the piecewise linear equation of state and improved forcing *** fluid-solid interaction in the model is employed to adjust the wettability of solid ***,the validity of the model is verified by comparison with experimental results and grid-independence ***,the cavitation bubble collapse in a hydrophobic concave is studied by investigating density field,pressure field,collapse time,and jet *** superimposed effect of the surface hydrophobicity and concave geometry is analyzed and explained in the framework of the pseudopotential *** study shows that the hydrophobic concave can enhance cavitation effect by decreasing cavitation threshold,accelerating collapse and increasing jet velocity.

关键词： cavitation bubble hydrophobic concave lattice Boltzmann model pseudopotential model

Characteristics of water volatilization and oxides generation by using positive and negative corona

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Plasma Science and Technology 2022年第4期24卷 61-70页

作者：陈可万良淏陈秉岩楚涛耿任悦宋德禹何湘苏巍殷澄单鸣雷蒋永锋 College of Science Hohai UniversityNanjing 210098People's Republic of China Nanjing Suman Plasma Science and Technology Co. LtdNanjing 211162People's Republic of China Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Changzhou 213022People's Republic of China College of Mechanical and Electrical Engineering Hohai UniversityNanjing 210098People's Republic of China

The physical and chemical properties have significant differences for the positive and negative charged particles generated by *** this work,a positive and negative corona discharge system was established,and two discharge reactors for charged particles restraining and acting were designed by a needle electrode covered with a quartz tube and a plate electrode filled with *** corona discharges happened within the needle-plate electrodes were excited by a positive and negative high voltage source,and the characteristics of both water volatilization and oxides generation were examined within influence of the distances of both quartz tube inside and *** results show that the characteristics of both the water volatilization and oxides generation can be affected by the distances of both quartz tube inside and *** the distances of tube inside were increased from 5.00 to 13.00 mm,the water volatilizations decreased under negative corona,and increased firstly and declined immediately under positive *** maximum value of the water volatilization appeared in the distances of tube inside with 6.00–8.00 *** addition,the concentrations of the HNO_(x) and H_(2)O_(2)in treated water decreased with increasing the distances of tube ***,with increasing the distances of tube outside from 4.00 to 14.00 mm,the change trends of both the water volatilizations and oxides presented the same as the distances of tube inside,and the maximum value of the water volatilization and oxides appeared in the distance of tube outside with about 9.00 ***,the positive corona can generate more water volatilizations and oxides in water than negative corona,and non H_(2)O_(2)can be produced by negative *** results reflect the difference between positive and negative corona interaction with water,which can provide reference for plasma application.

关键词： positive corona negative corona water volatilization oxides generation

Modeling for Collapsing Cavitation Bubble near Rough Solid Wall by Mulit-Relaxation-Time Pseudopotential Lattice Boltzmann Model

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Journal of Applied Mathematics and Physics 2017年第6期5卷 1243-1256页

作者： minglei shan Yipeng Zhu Cheng Yao Qingbang Han Changping Zhu College of Internet of Things Engineering Hohai University Changzhou China Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai University Changzhou China

Cavitation bubble collapse near rough solid wall is modeled by the multi-relaxation-time (MRT) pseudopotential lattice Boltzmann (LB) model. The modified forcing scheme, which can achieve LB model’s thermodynamic consistency by tuning a parameter related with the particle interaction range, is adopted to achieve desired stability and density ratio. The bubble collapse near rough solid wall was simulated by the improved MRT pseudopotential LB model. The mechanism of bubble collapse is studied by investigating the bubble profiles, pressure field and velocity field evolution. The eroding effects of collapsing bubble are analyzed in details. It is found that the process and the effect of the interaction between bubble collapse and rough solid wall are affected seriously by the geometry of solid boundary. At the same time, it demonstrates that the MRT pseudopotential LB model is a potential tool for the investigation of the interaction mechanism between the collapsing bubble and complex geometry boundary.

关键词： Cavitation Bubble Bubble Collapse Lattice Boltzmann Method Pseudopotential Model Rough Solid Wall