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Free rotation of conducting and dielectric spheres in a uniform electrostatic field 导电球和介电球在均匀静电场中的自由旋转
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-11 DOI: 10.1016/j.elstat.2025.104120
A. Duviryak
{"title":"Free rotation of conducting and dielectric spheres in a uniform electrostatic field","authors":"A. Duviryak","doi":"10.1016/j.elstat.2025.104120","DOIUrl":"10.1016/j.elstat.2025.104120","url":null,"abstract":"<div><div>Rotation of conducting and dielectric spherical particles levitating in the uniform electrostatic field is considered. A dipole moment of the spherical particle induced by the external uniform electrostatic field is inclined to the field if the particle rotates. This causes the torque braking the rotation. Vectors of dipole moment and torque depend both on an angular velocity of the particle and its electric properties. Equations of rotary motion of the particle levitating in the external field are integrable in quadratures. Few examples of the conducting and dielectric particles are solved explicitly.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104120"},"PeriodicalIF":1.9,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597358","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
Mathematical identities for the electrostatic potential of a uniformly charged ring: A rigorous proof 均匀带电环静电势的数学恒等式：严格的证明
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-08 DOI: 10.1016/j.elstat.2025.104125
J. Ricardo de Sousa , Marcio Gomes , Orion Ciftja
{"title":"Mathematical identities for the electrostatic potential of a uniformly charged ring: A rigorous proof","authors":"J. Ricardo de Sousa ,&nbsp;Marcio Gomes ,&nbsp;Orion Ciftja","doi":"10.1016/j.elstat.2025.104125","DOIUrl":"10.1016/j.elstat.2025.104125","url":null,"abstract":"<div><div>We show a rigorous mathematical proof of some mathematical identities that were uncovered during studies of the electrostatic potential generated by a uniformly charged ring. The authors in Ciftja et al., (2009) presented two independent expressions for this potential on the plane of the ring: one derived using <em>complete elliptic integrals</em> and the other one obtained through an integral involving <em>Bessel functions</em>. By asserting the equivalence of these two expressions they proposed a remarkable identity that connects integrals of products of Bessel functions with complete elliptic integrals of the first kind. However, they were unable to provide a formal mathematical proof of these results. The goal of this paper is to fill this gap by presenting a rigorous and detailed derivation of these mathematical identities. To accomplish this task, we employed standard transformations from the theory of special functions. The key steps in the proof include rewriting the Bessel integral representation of the potential in terms of the Legendre function of the second kind and subsequently expressing it in terms of the complete elliptic integral via known transformations. By establishing the exact equivalence between the Bessel-based and complete elliptic integral-based formulations of the problem, we not only can prove the proposed identities, but also reinforce their relevance for future applications in electrostatics and mathematical physics. These results demonstrate the deep connections that exist among various special functions and highlight the importance of rigorous analysis in validating assumptions made in earlier theoretical work.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104125"},"PeriodicalIF":1.9,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572676","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
Interpolation formula for the capacitance of an open conducting cylinder 开导圆柱电容的插补公式
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-08 DOI: 10.1016/j.elstat.2025.104132
John Lekner
{"title":"Interpolation formula for the capacitance of an open conducting cylinder","authors":"John Lekner","doi":"10.1016/j.elstat.2025.104132","DOIUrl":"10.1016/j.elstat.2025.104132","url":null,"abstract":"<div><div>The capacitance of an open conducting cylindrical pipe may be approximated by the arithmetic-geometric mean of <span><math><mrow><mi>π</mi><mi>a</mi></mrow></math></span> and <span><math><mrow><mi>b</mi></mrow></math></span>, where <span><math><mrow><mn>2</mn><mi>a</mi></mrow></math></span> is the cylinder diameter and <span><math><mrow><mn>2</mn><mi>b</mi></mrow></math></span> is its length. The formula correctly incorporates the short and long cylinder limits.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104132"},"PeriodicalIF":1.9,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572675","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
Ignition risk due to electrostatic discharges obtained from small scoops 由小勺子产生的静电放电引起的点火危险
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-07 DOI: 10.1016/j.elstat.2025.104128
Jeremy M. Smallwood
{"title":"Ignition risk due to electrostatic discharges obtained from small scoops","authors":"Jeremy M. Smallwood","doi":"10.1016/j.elstat.2025.104128","DOIUrl":"10.1016/j.elstat.2025.104128","url":null,"abstract":"<div><div>Small scoops such as might be used to handle powders were tested by rubbing with materials based on IEC 60079-32-2 and also by scooping a sample material (glass beads). Discharges from the scoops were evaluated against the criteria given in IEC 60079-32-1. Although the projected areas of the scoops were less than 10000 mm<sup>2</sup>, ESD with charge transfer greater than 25 nC or 60 nC were regularly obtained. Tribocharging the scoops based on the IEC 60079-32-2 test gave charge transferred in discharges greater than when charging by scooping glass beads. It is concluded that some risk of ignition could occur to near optimum flammable atmospheres from Group IIA and IIB materials.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104128"},"PeriodicalIF":1.9,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572674","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
Numerical and experimental investigation of electrode configuration effects on EHD heat transfer enhancement of dielectric fluid in a double-pipe annulus 电极构型对双管环空介质流体EHD强化传热影响的数值与实验研究
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-04 DOI: 10.1016/j.elstat.2025.104126
M. Amirhakimi, M. Saffar-Avval, M.R. Hajmohammadi, M. Mirzaei, G. Ahmadibeni
{"title":"Numerical and experimental investigation of electrode configuration effects on EHD heat transfer enhancement of dielectric fluid in a double-pipe annulus","authors":"M. Amirhakimi,&nbsp;M. Saffar-Avval,&nbsp;M.R. Hajmohammadi,&nbsp;M. Mirzaei,&nbsp;G. Ahmadibeni","doi":"10.1016/j.elstat.2025.104126","DOIUrl":"10.1016/j.elstat.2025.104126","url":null,"abstract":"<div><div>This study investigates the effect of electrode size and inner gaps on heat transfer enhancement in transformer oil using Electrohydrodynamic conduction pumping. A numerical solver has been developed in OpenFOAM and validated to analyze 16 geometries across five Reynolds numbers (up to 50) and seven voltages (up to 24 kV). Heat transfer enhancement increased from 43 % to 80 % by optimizing the ground electrode size and inner gap. The optimal configuration—high voltage electrode (6 mm), inner gap (7 mm), and ground electrode (15 mm)—achieved a Performance Evaluation Criteria of 1.042, maintaining efficiency while considering pressure loss.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104126"},"PeriodicalIF":1.9,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557086","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
Improved insulation performance of HVDC GIS cable terminal with aromatic molecule-doped silicone oil coating 芳香族分子掺硅油涂层改善高压直流GIS电缆终端绝缘性能
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-04 DOI: 10.1016/j.elstat.2025.104129
Wenbo Zhu , Kaulya Pathiraja , Baojun Hui , Xu Guo , Mingli Fu , Shijie Du , Linjie Zhao , Yuhuai Wang , Jin Li
{"title":"Improved insulation performance of HVDC GIS cable terminal with aromatic molecule-doped silicone oil coating","authors":"Wenbo Zhu ,&nbsp;Kaulya Pathiraja ,&nbsp;Baojun Hui ,&nbsp;Xu Guo ,&nbsp;Mingli Fu ,&nbsp;Shijie Du ,&nbsp;Linjie Zhao ,&nbsp;Yuhuai Wang ,&nbsp;Jin Li","doi":"10.1016/j.elstat.2025.104129","DOIUrl":"10.1016/j.elstat.2025.104129","url":null,"abstract":"<div><div>HVDC GIS cable terminals, where the cable connects to gas insulated switchgears, are particularly vulnerable to breakdown caused by factors such as high temperature, lack of pressure, space charge accumulation, and material degradation. This study explores stabilizing silicone oil coating, by incorporating benzene derivatives. The paper proposes the use of quantum chemical calculations (QCC) to identify suitable additives that can optimize the performance of silicone oil. By enhancing the dielectric properties and thermal stability of silicone oil, this research seeks to reduce interface discharge and increase the longevity and reliability of high-voltage cable terminals.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104129"},"PeriodicalIF":1.9,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557085","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
Interior and exterior surface charge densities and quadrupole moment of an open conducting cylinder 开放导电圆柱体的内外表面电荷密度和四极矩
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-01 DOI: 10.1016/j.elstat.2025.104124
John Lekner
{"title":"Interior and exterior surface charge densities and quadrupole moment of an open conducting cylinder","authors":"John Lekner","doi":"10.1016/j.elstat.2025.104124","DOIUrl":"10.1016/j.elstat.2025.104124","url":null,"abstract":"<div><div>The interior and exterior surface charge densities on a conducting cylindrical pipe are expressed in terms of its capacitance coefficients. The interior charge density is always smaller than the exterior density. The cylinder quadrupole moment is shown to depend on the first two capacitance coefficients. Explicit values are calculated for a range of aspect ratios of the charged cylinder.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104124"},"PeriodicalIF":1.9,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518549","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
Influence of electric potential boundary condition on the electrospraying process 电势边界条件对电喷涂过程的影响
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-01 DOI: 10.1016/j.elstat.2025.104119
Vimal Chauhan, Shyam Sunder, Venkatesh K.P. Rao
{"title":"Influence of electric potential boundary condition on the electrospraying process","authors":"Vimal Chauhan,&nbsp;Shyam Sunder,&nbsp;Venkatesh K.P. Rao","doi":"10.1016/j.elstat.2025.104119","DOIUrl":"10.1016/j.elstat.2025.104119","url":null,"abstract":"<div><div>In the current work, we perform three dimensional numerical simulations of the electrospraying process. Our aim is to investigate the effect of electric potential boundary condition on the electrospraying process of a liquid. We observe a steady electrospraying process in the cone jet mode for the case of uniform electric potential boundary condition. On the other hand, we observe a highly unsteady, violent electrospraying process for the case of non-uniform boundary condition. We provide explanation of this widely different behavior of the electrospraying process.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104119"},"PeriodicalIF":1.9,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518550","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
Investigating the effect of installing an electrostatic system on the performance of an orchard automizer sprayer 研究安装静电系统对果园自动喷雾机性能的影响
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-06-20 DOI: 10.1016/j.elstat.2025.104122
Rasool Khodabakhshian Kargar , Hajar Sadat Seyyed Ali Bik Lavasani , Seyed Morteza Javadpour
{"title":"Investigating the effect of installing an electrostatic system on the performance of an orchard automizer sprayer","authors":"Rasool Khodabakhshian Kargar ,&nbsp;Hajar Sadat Seyyed Ali Bik Lavasani ,&nbsp;Seyed Morteza Javadpour","doi":"10.1016/j.elstat.2025.104122","DOIUrl":"10.1016/j.elstat.2025.104122","url":null,"abstract":"<div><div>Despite knowledge of the harmful effects of pesticides, the production and sale of pesticides and sprayers remain a growing industry worldwide, particularly in Asia. Given the current need to ensure food supply for the increasing global population and the necessity of pesticide use, the development of innovative systems presents a practical and rapid solution to reduce pesticide consumption. Therefore, the utilization of pesticide technologies, such as electrostatic sprayers, can not only enhance the performance of pesticide application but also reduce the adverse environmental impacts of pesticide use. Furthermore, since electrostatic systems are relatively simple and can be installed on various types of sprayers, they can be commercially utilized in agriculture within a short timeframe. In this study, an electrostatic system was designed and constructed to charge pesticide particles and improve the performance of orchard automizer sprayers. The performance of this system was assessed, and it successfully charged water droplets through the electrostatic induction method, achieving a maximum specific charge of 1.0 millicoulombs per kilogram at a flow rate of 1 L per minute and a distance of 10 centimeters from the sprayer nozzle, using a voltage of 20 kilovolts. Moreover, the performance of the electrostatic orchard automizer sprayer was evaluated under real orchard conditions, considering pesticide deposition on trees and the ground, as well as particle drift. The assessment involved image processing of water-sensitive paper to evaluate pesticide deposition. The electrostatic system significantly reduced particle drift to zero, and on average, 12 % of the water-sensitive paper surfaces, placed for simulating pesticide deposition on the back of leaves, became pesticide-laden.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104122"},"PeriodicalIF":1.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144320837","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
Degrade VOCs from spray exhaust gas by grounding electrode atomized dielectric barrier discharge coupled with Fenton reagent 采用接地电极雾化介质阻挡放电耦合Fenton试剂降解喷雾废气中的挥发性有机化合物
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-06-19 DOI: 10.1016/j.elstat.2025.104121
Shengnan Du , Siying Cui , Miaofei Yu , Junfeng Mi
{"title":"Degrade VOCs from spray exhaust gas by grounding electrode atomized dielectric barrier discharge coupled with Fenton reagent","authors":"Shengnan Du ,&nbsp;Siying Cui ,&nbsp;Miaofei Yu ,&nbsp;Junfeng Mi","doi":"10.1016/j.elstat.2025.104121","DOIUrl":"10.1016/j.elstat.2025.104121","url":null,"abstract":"<div><div>In this paper, benzene, methylbenzene and dimethylbenzene were used to simulate the spray exhaust gas, and a new type of threaded-wire hole electrode was designed as the inner electrode of the grounding electrode atomized dielectric barrier discharge reactor. The discharge characteristics were investigated and the effects of different factors on the degradation efficiency of VOCs were discussed. On this basis, coupled with Fenton reagent, and the results showed that adding Fenton reagent could improve the degradation efficiency, and the degradation process of VOCs was optimized by changing the ratio of Fenton reagent, which provided a reference for the study of VOCs degradation.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104121"},"PeriodicalIF":1.9,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312722","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
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