Journal of Electrostatics最新文献_第6页

The electric potential and field of a finite conducting rod, and a conducting disk 有限导电杆和导电盘的电动势和电场

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-03-21 DOI: 10.1016/j.elstat.2024.103920

Mohammad Khorrami

引用次数: 0

Dielectric barrier discharge actuators: Momentum injection into co-flow and counter-flow freestream 介质阻挡放电致动器：向同流和逆流自由流注入动量

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-03-21 DOI: 10.1016/j.elstat.2024.103918

Anthony Tang , Nathan Li , Benjamin Price , Alexander Mamishev , Alberto Aliseda , Igor Novosselov

{"title":"Dielectric barrier discharge actuators: Momentum injection into co-flow and counter-flow freestream","authors":"Anthony Tang , Nathan Li , Benjamin Price , Alexander Mamishev , Alberto Aliseda , Igor Novosselov","doi":"10.1016/j.elstat.2024.103918","DOIUrl":"https://doi.org/10.1016/j.elstat.2024.103918","url":null,"abstract":"<div><p>In a quiescent environment, dielectric barrier discharge (DBD) plasma actuators generate a wall jet through the interaction of ionized and neutral molecules in an electric field. In external flow, the coupling between electrohydrodynamic (EHD), turbulence, inertial, and viscous effects in the flow boundary layer is more complex and requires additional investigation. We experimentally study momentum injection by DBD actuators into the free stream flow with Re = 35,000 and 75,000 in co-flow and counter-flow scenarios over a range of V<sub>AC</sub> = 12 kV–19.5 kV peak-to-peak at a frequency of 2 kHz. In co-flow, the momentum injection leads to boundary layer thinning and fluid entrainment from the freestream into the DBD forcing region, while in the counter-flow configuration, flow separation can occur. A separation bubble is observed at Re = 35,000 for the tested condition. The momentum difference in the counter-flow configuration is six times greater than the EHD jet momentum in a quiescent environment. Both co-flow and counter-flow momentum injections show diminishing effects with higher Re. We show that the resulting flow pattern is not a superposition of the EHD jet and the free stream but is determined by the coupling and competition of inertial, viscous, and Coulombic effects between the EHD-driven forcing and the external flow. The proposed non-dimensional momentum ratio (M*) of EHD jet momentum to momentum in the external flow boundary layer can be used to predict the onset of separation; however, additional experimental and numerical studies are required to generalize this concept to other flow scenarios. The velocity profiles and momentum measurements presented here can be used to validate numerical models and inform the design of DBD actuators for active flow control.</p></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"129 ","pages":"Article 103918"},"PeriodicalIF":1.8,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140180317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling analysis of the electrostatic interaction between a nth-order electric multipole moment and dielectric layers utilizing the image multipole method 利用图像多极法对 nth 阶电多极矩与介电层之间的静电相互作用进行建模分析

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-03-16 DOI: 10.1016/j.elstat.2024.103906

Yue Feng , Zilong Zhou , Yanhui Han , Zhiliang Gao , Xu Tang , ShanShan Ma , Ying Xiong

{"title":"Modeling analysis of the electrostatic interaction between a nth-order electric multipole moment and dielectric layers utilizing the image multipole method","authors":"Yue Feng , Zilong Zhou , Yanhui Han , Zhiliang Gao , Xu Tang , ShanShan Ma , Ying Xiong","doi":"10.1016/j.elstat.2024.103906","DOIUrl":"https://doi.org/10.1016/j.elstat.2024.103906","url":null,"abstract":"<div><p>Accurate determination of the electrostatic force exerted on multipole moments is essential in comprehending the interaction between charged bodies and dielectric layers. A comprehensive solution is presented in this study for the calculation of the electric potential, field, and force generated by <em>n</em>th-order electric multipole above a semi-infinite dielectric body covered by a dielectric layer using the image multipole method. The present study investigates the impact of dielectric thickness, permittivity, and separation distance on the electrostatic interaction between an electric multipole moment and a semi-infinite dielectric body. The calculation results indicate that as the thickness of the dielectric layer increases and the dielectric constant of the surrounding medium surpasses that of the dielectric layer, the electrostatic attractive force undergoes a transition to a repulsive force. The magnitude of the electrostatic force acting on a <em>n</em>th-order electric multipole moment is directly proportional to the square of the value of the electric multipole moment and inversely proportional to the 2 (<em>n</em>+1) power of the distance.</p></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"129 ","pages":"Article 103906"},"PeriodicalIF":1.8,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140142042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrical properties of the unit square plate 单位方形板的电气性能

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-03-12 DOI: 10.1016/j.elstat.2024.103907

Jaeho Kim , Chi-Ok Hwang

引用次数: 0

Influence of nonuniform electric field due to a spherical collector on the particles dynamics in quiescent air 球形收集器产生的非均匀电场对静止空气中粒子动力学的影响

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-03-12 DOI: 10.1016/j.elstat.2024.103916

Abhishek Srivastava, Debabrat Biswal, Bahni Ray, Mayank Kumar, Debabrata Dasgupta

引用次数: 0

Extraction of transferred charge signal of gas-solid two-phase flow based on nonlinear time domain analysis 基于非线性时域分析的气固两相流转移电荷信号提取方法

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-03-01 DOI: 10.1016/j.elstat.2024.103905

Lin Jia, Xujun Su, Guibo Yu, Qiao Ma, Jinli Che

{"title":"Extraction of transferred charge signal of gas-solid two-phase flow based on nonlinear time domain analysis","authors":"Lin Jia, Xujun Su, Guibo Yu, Qiao Ma, Jinli Che","doi":"10.1016/j.elstat.2024.103905","DOIUrl":"https://doi.org/10.1016/j.elstat.2024.103905","url":null,"abstract":"<div><p>—When the particles are in the gas-solid two-phase flow, the transferred charge will be generated. The transferred signal obtained by using the inner flush-mounted electrostatic sensor is rich in flow information, which can provide important support for studying the flow law of gas-solid two-phase flow. In this paper, the nonlinear time-domain analysis method based on embedded empirical mode decomposition (EEMD) and largest Lyapunov exponent (LLE) is proposed to extract the transferred charge signal of gas-solid two-phase flow. Firstly, the electrostatic signal is decomposed and the induced charge signal is removed by the combination of EEMD and autocorrelation function correlation coefficient index. Then, the LLE of the remaining intrinsic mode function (IMF) components is calculated, and the corresponding IMF is selected to reconstruct into the transferred charge signal according to the condition that LLE>0. The results show that the LLE of transferred charge signal increases with the increase of the superficial gas velocity and decreases with the increase of solid gas mass ratio. The root mean square (RMS) and standard deviation (STD) of the transferred charge signal increase with the increase of the superficial gas velocity, increase with the increase of the solid gas mass ratio, and slow down at high solid gas mass ratio.</p></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"128 ","pages":"Article 103905"},"PeriodicalIF":1.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139992996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An investigation of the electroconvection flow and solid extraction during melting of phase-change materials 相变材料熔化过程中的电对流和固体萃取研究

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-02-23 DOI: 10.1016/j.elstat.2024.103904

Ahmed Hassan, James S. Cotton

引用次数: 0

Staticaponics: Electrospray delivery of nutrients and water to the plant root zone 静态鱼菜共生电喷雾向植物根部输送养分和水分

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-02-20 DOI: 10.1016/j.elstat.2024.103902

S. Rahman Pejman Sereshkeh , Bryan Llumiquinga , Sriya Bapatla , Michael J. Grzenda , David Specca , Arend-Jan Both , Jonathan P. Singer

引用次数: 0

Enhancement of flow mixing using a two-stage EHD gas pump with electrodes anchored at one corner of channel 使用电极固定在通道一角的双级 EHD 气体泵加强水流混合

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-02-13 DOI: 10.1016/j.elstat.2024.103903

S.-C. Lin , S.-L. Wu , S.-H. Liou , F.C. Lai

{"title":"Enhancement of flow mixing using a two-stage EHD gas pump with electrodes anchored at one corner of channel","authors":"S.-C. Lin , S.-L. Wu , S.-H. Liou , F.C. Lai","doi":"10.1016/j.elstat.2024.103903","DOIUrl":"https://doi.org/10.1016/j.elstat.2024.103903","url":null,"abstract":"<div><p>The present study examines the use of a two-stage electrohydrodynamic (EHD) gas pump with its electrodes assembly anchored at one corner of a square channel to modify the characteristics of flow inside the channel. Specifically, the proposed EHD pump is examined for its effectiveness in enhancing flow mixing as well as reducing the power requirement. The present study is also aimed at confirming one of the important conclusions drawn from the authors’ earlier works that, given the same number of emitting electrodes, the performance of an EHD pump can be specifically tailored by rearranging the location and orientation of the electrodes so that the modified characteristics of flow can achieve the desired effect. To evaluate the effectiveness of the proposed electrode configuration, the performance of the pump is compared with that of a previous study in which a two-stage gas pump utilizes an electrode assembly mounted on the two parallel walls. For both pumps, the emitting electrodes are flush mounted on the channel walls so that the air flow produced is similar to that of a wall jet. Through the performance assessment, the results obtained from the present study can provide useful information for practical applications of EHD gas pumps.</p></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"128 ","pages":"Article 103903"},"PeriodicalIF":1.8,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139731647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical comparison of effects of different cross fields on low pressure DC glow discharge 不同交叉场对低压直流辉光放电影响的理论比较

IF 1.8 4区工程技术

Journal of Electrostatics Pub Date : 2024-02-06 DOI: 10.1016/j.elstat.2024.103900

Shen Gao

引用次数: 0