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Study on electrostatic elimination characteristics of silicon needle discharge 硅针放电的静电消除特性研究
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-16 DOI: 10.1016/j.elstat.2025.104117
Yanyi Wang , Li Wang , Yong Chen , Zihan Yuan , Xuandong Liu
{"title":"Study on electrostatic elimination characteristics of silicon needle discharge","authors":"Yanyi Wang ,&nbsp;Li Wang ,&nbsp;Yong Chen ,&nbsp;Zihan Yuan ,&nbsp;Xuandong Liu","doi":"10.1016/j.elstat.2025.104117","DOIUrl":"10.1016/j.elstat.2025.104117","url":null,"abstract":"<div><div>In the process of semiconductor production, charge accumulation can easily lead to electrostatic breakdown of the chip. With a silicon needle as the electrode, the DC high voltage electrostatic eliminator can achieve effective electrostatic control without metal impurities. Therefore, it has a broad application prospect. To investigate the efficacy and characteristics of electrostatic elimination using silicon needle electrodes, a test platform was established to evaluate their performance under the direct current conditions. The static decay time and balance voltage of the electrostatic elimination were determined as the characteristic indices. This study examined the influence of voltage amplitude, voltage polarity, operating distance and wind speed on the electrostatic elimination. The experimental results indicate that an increase in voltage accelerates the speed of electrostatic dissipation. A polarity effect was observed during the electrostatic elimination process of silicon needles. The static decay time under negative polarity is shorter than that under positive polarity. Furthermore, the balance voltage of negative polarity demonstrates superior performance compared to positive polarity. Additionally, the static decay time increases nonlinearly with the increase of the operating distance. In order to achieve high speed and balance in electrostatic elimination performance, it is recommended to add a specific direction of wind around the electrode, which also reduces the output requirements of the power supply.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104117"},"PeriodicalIF":1.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634088","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
Pulsed electric field (PEF) application on mung bean sprouts growth promotion process: Effect on germination, morphological index and physicochemical properties 脉冲电场（PEF）在绿豆芽生长促进过程中的应用：对发芽、形态指标和理化性质的影响
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-16 DOI: 10.1016/j.elstat.2025.104136
Mochen Liu , Yinfa Yan , Baoji Liu , Qinglu Yang , Jing Wang , Qian Peng , Zhanhua Song , Xiangyun Sun , Fade Li , Fuyang Tian , Yaoyao Li , Yao Lu
{"title":"Pulsed electric field (PEF) application on mung bean sprouts growth promotion process: Effect on germination, morphological index and physicochemical properties","authors":"Mochen Liu ,&nbsp;Yinfa Yan ,&nbsp;Baoji Liu ,&nbsp;Qinglu Yang ,&nbsp;Jing Wang ,&nbsp;Qian Peng ,&nbsp;Zhanhua Song ,&nbsp;Xiangyun Sun ,&nbsp;Fade Li ,&nbsp;Fuyang Tian ,&nbsp;Yaoyao Li ,&nbsp;Yao Lu","doi":"10.1016/j.elstat.2025.104136","DOIUrl":"10.1016/j.elstat.2025.104136","url":null,"abstract":"<div><div>Enhancing the growth rate and shortening the growth cycle of mung bean sprouts while maintaining quality remains a significant challenge. This study presents a novel approach using pulsed electric field (PEF) treatment to improve both the quality and absolute growth rate of mung bean sprouts. Specifically, mung bean seeds were pretreated using PEF, and the effects of PEF intensity and frequency on the growth of mung bean sprouts were analyzed based on orthogonal germination experiments. Optimal treatment conditions were identified as a PEF intensity of 119.2 kV/m, a frequency of 9.0 Hz, and a treatment duration of 100 s. Under these conditions, mung bean sprouts exhibited substantial increases in total length, hypocotyl length, and fresh weight, with fresh weight rising by 22.3 % compared to the control group (P &lt; 0.01). Nutrient analysis revealed significant increases in protein (28.1 %), carbohydrate (21 %), and ash content (14.3 %) post-treatment, highlighting PEF's effectiveness in enhancing the nutritional profile of mung bean sprouts. Conversely, we noted the potential risks of excessive PEF intensity, which could lead to irreversible cellular damage. The PEF method proved to be a rapid and effective technique for boosting mung bean sprout growth, shortening growth cycle, and enhancing sprout yield.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104136"},"PeriodicalIF":1.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653477","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
Application of Critical Energy Density concept for Minimum Ignition Energy determination 临界能量密度概念在最小点火能量确定中的应用
IF 1.9 4区 工程技术
Journal of Electrostatics Pub Date : 2025-07-15 DOI: 10.1016/j.elstat.2025.104131
Sabrina Copelli , Marco Barozzi , Davide Ballinari , Ottavio Lugaresi , Riccardo Moneta
{"title":"Application of Critical Energy Density concept for Minimum Ignition Energy determination","authors":"Sabrina Copelli ,&nbsp;Marco Barozzi ,&nbsp;Davide Ballinari ,&nbsp;Ottavio Lugaresi ,&nbsp;Riccardo Moneta","doi":"10.1016/j.elstat.2025.104131","DOIUrl":"10.1016/j.elstat.2025.104131","url":null,"abstract":"<div><div>This study presents a new concept, referred to as Critical Energy Density (CED), for estimating the Minimum Ignition Energy (MIE) of organic powders. Only readily experimental data, such as granulometric analysis, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC), are required for running the mathematical model. The algorithm simulates the heating of a dust cloud exposed to an electrical spark and detects the ignition by comparing the energy released by the volatiles’ homogeneous combustion with a threshold value corresponding to the minimum energy required to sustain the flame propagation (that is, the CED). Validation was performed on six different organic powders, with estimated MIE values showing good agreement with experimental data. This approach provides a cost-effective tool for early-stage hazard assessment in industrial environments where combustible powders are present and supports the development of a safer process design.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"136 ","pages":"Article 104131"},"PeriodicalIF":1.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632546","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
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
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