Pub Date : 2025-01-01DOI: 10.1016/j.elstat.2024.104008
Seong Bin Kim , Ju Hye Kim , Dong Kyun Min
An electrostatic chuck is a device used for the force between charges applied between two parallel plates to attract and secure substrates, such as wafers or OLED panels. Unlike mechanical adhesion methods, which rely on physical fixation, this method uses electrostatic forces for adhesion, making it crucial to verify the chucking force. As the size of the substrate increased, deformation due to gravity or the chucking force also increased, and the chucking force decreased sharply as the distance between the chuck and the substrate increased. This distance between the chuck and the substrate is represented by an Air Gap. With the trend of displays shifting from small to large OLEDs, the consideration of substrate deformation has become necessary. In this study, to verify substrate deformation through various patterns, a simplified 2D model using Maxwell, an electromagnetic field analysis program, and Mechanical, a static structural analysis program, both by Ansys, was utilized to observe changes in adhesive force. Additionally, 3D modeling was applied to verify the adhesive force and deformation according to the voltage and size of various patterns.
{"title":"Study of chucking force distribution according to substrate pattern and deformation characteristics of electrostatic chuck for deposition","authors":"Seong Bin Kim , Ju Hye Kim , Dong Kyun Min","doi":"10.1016/j.elstat.2024.104008","DOIUrl":"10.1016/j.elstat.2024.104008","url":null,"abstract":"<div><div>An electrostatic chuck is a device used for the force between charges applied between two parallel plates to attract and secure substrates, such as wafers or OLED panels. Unlike mechanical adhesion methods, which rely on physical fixation, this method uses electrostatic forces for adhesion, making it crucial to verify the chucking force. As the size of the substrate increased, deformation due to gravity or the chucking force also increased, and the chucking force decreased sharply as the distance between the chuck and the substrate increased. This distance between the chuck and the substrate is represented by an Air Gap. With the trend of displays shifting from small to large OLEDs, the consideration of substrate deformation has become necessary. In this study, to verify substrate deformation through various patterns, a simplified 2D model using Maxwell, an electromagnetic field analysis program, and Mechanical, a static structural analysis program, both by Ansys, was utilized to observe changes in adhesive force. Additionally, 3D modeling was applied to verify the adhesive force and deformation according to the voltage and size of various patterns.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"133 ","pages":"Article 104008"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.elstat.2024.104011
Orion Ciftja
We describe a mathematical method that makes possible the calculation of the electrostatic energy of a completely arbitrary solid spherical sector with uniform volume charge density. The success of the approach hinges on a specific transformation formula for the Coulomb potential that is valid in spherical coordinates. The final result is general and applies to any arbitrary angle of the solid spherical sector. Simple analytic expressions that are valid for the special cases of a solid sphere and hemisphere are obtained.
{"title":"Electrostatic energy of a solid spherical sector with uniform volume charge density","authors":"Orion Ciftja","doi":"10.1016/j.elstat.2024.104011","DOIUrl":"10.1016/j.elstat.2024.104011","url":null,"abstract":"<div><div>We describe a mathematical method that makes possible the calculation of the electrostatic energy of a completely arbitrary solid spherical sector with uniform volume charge density. The success of the approach hinges on a specific transformation formula for the Coulomb potential that is valid in spherical coordinates. The final result is general and applies to any arbitrary angle of the solid spherical sector. Simple analytic expressions that are valid for the special cases of a solid sphere and hemisphere are obtained.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"133 ","pages":"Article 104011"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135067","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}
Pub Date : 2025-01-01DOI: 10.1016/j.elstat.2024.103994
Qing Xia , Ming-hui Cai , Tao Yang , Liang-liang Xu , Xin-yu Jia
<div><div>Deep dielectric charging and discharging by electrons has been known for years. However, deep space missions towards the Moon, Mars and Jupiter have developed these years. In these space environments, spacecrafts would expose in high fluxes of solar energetic protons which demands the understanding of charging and discharging mechanism by protons. In this paper, dielectric breakdown of polyimide(PI) material irradiated by 40 MeV-protons was studied. Discharge of PI materials with different thicknesses of <span><math><mrow><mn>21</mn><mo>.</mo><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></math></span>, <span><math><mrow><mn>15</mn><mo>.</mo><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></math></span>, <span><math><mrow><mn>13</mn><mo>.</mo><mn>6</mn><mspace></mspace><mi>mm</mi></mrow></math></span> and <span><math><mrow><mn>8</mn><mo>.</mo><mn>2</mn><mspace></mspace><mi>mm</mi></mrow></math></span> were investigated. For PI films with thickness of <span><math><mrow><mn>21</mn><mo>.</mo><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></math></span>, <span><math><mrow><mn>15</mn><mo>.</mo><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></math></span>, and <span><math><mrow><mn>13</mn><mo>.</mo><mn>6</mn><mspace></mspace><mi>mm</mi></mrow></math></span>, proton discharges were firstly triggered as the protons reached integral fluxes of <span><math><mrow><mn>1</mn><mo>.</mo><mn>2</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>12</mn></mrow></msup><mspace></mspace><mi>p</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>,</mo><mn>2</mn><mo>.</mo><mn>7</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>12</mn></mrow></msup><mspace></mspace><mi>p</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span> and <span><math><mrow><mn>1</mn><mo>.</mo><mn>2</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>12</mn></mrow></msup><mspace></mspace><mi>p</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>, respectively. No discharge was achieved for PI film with <span><math><mrow><mn>8</mn><mo>.</mo><mn>2</mn><mspace></mspace><mi>mm</mi></mrow></math></span> thickness. Besides, discharge events originated by secondary electrons were also achieved during irradiation.</div><div>On the other hand, the internal potential and electric field was also simulated using simulation of internal charging software for 3D (SIC3D). Simulation results indicate that discharge threshold caused by protons is decided by two factors: the internal electric field and the length of discharge path. After irradiated by protons, a thicker material might store more protons and produce stronger internal electric field, but might also has a longer discharge path. The integral proton flux required for discharging was <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>12</mn></mrow></msup><mspace></mspace><mi>p</mi><mo>/</mo><msup>
{"title":"Dielectric discharge of PI material irradiated by 40 MeV-protons","authors":"Qing Xia , Ming-hui Cai , Tao Yang , Liang-liang Xu , Xin-yu Jia","doi":"10.1016/j.elstat.2024.103994","DOIUrl":"10.1016/j.elstat.2024.103994","url":null,"abstract":"<div><div>Deep dielectric charging and discharging by electrons has been known for years. However, deep space missions towards the Moon, Mars and Jupiter have developed these years. In these space environments, spacecrafts would expose in high fluxes of solar energetic protons which demands the understanding of charging and discharging mechanism by protons. In this paper, dielectric breakdown of polyimide(PI) material irradiated by 40 MeV-protons was studied. Discharge of PI materials with different thicknesses of <span><math><mrow><mn>21</mn><mo>.</mo><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></math></span>, <span><math><mrow><mn>15</mn><mo>.</mo><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></math></span>, <span><math><mrow><mn>13</mn><mo>.</mo><mn>6</mn><mspace></mspace><mi>mm</mi></mrow></math></span> and <span><math><mrow><mn>8</mn><mo>.</mo><mn>2</mn><mspace></mspace><mi>mm</mi></mrow></math></span> were investigated. For PI films with thickness of <span><math><mrow><mn>21</mn><mo>.</mo><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></math></span>, <span><math><mrow><mn>15</mn><mo>.</mo><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></math></span>, and <span><math><mrow><mn>13</mn><mo>.</mo><mn>6</mn><mspace></mspace><mi>mm</mi></mrow></math></span>, proton discharges were firstly triggered as the protons reached integral fluxes of <span><math><mrow><mn>1</mn><mo>.</mo><mn>2</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>12</mn></mrow></msup><mspace></mspace><mi>p</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>,</mo><mn>2</mn><mo>.</mo><mn>7</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>12</mn></mrow></msup><mspace></mspace><mi>p</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span> and <span><math><mrow><mn>1</mn><mo>.</mo><mn>2</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>12</mn></mrow></msup><mspace></mspace><mi>p</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>, respectively. No discharge was achieved for PI film with <span><math><mrow><mn>8</mn><mo>.</mo><mn>2</mn><mspace></mspace><mi>mm</mi></mrow></math></span> thickness. Besides, discharge events originated by secondary electrons were also achieved during irradiation.</div><div>On the other hand, the internal potential and electric field was also simulated using simulation of internal charging software for 3D (SIC3D). Simulation results indicate that discharge threshold caused by protons is decided by two factors: the internal electric field and the length of discharge path. After irradiated by protons, a thicker material might store more protons and produce stronger internal electric field, but might also has a longer discharge path. The integral proton flux required for discharging was <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>12</mn></mrow></msup><mspace></mspace><mi>p</mi><mo>/</mo><msup>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"133 ","pages":"Article 103994"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135068","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}
Pub Date : 2024-12-31DOI: 10.1016/j.elstat.2024.104017
Kai Li , Peng Teng , Ruiquan Fei , Zhiqiang Lu , Liancheng Zhang , Xuming Zhang
CO2 hydrogenation reaction was conducted in dielectric barrier discharge plasma at ambient condition. A comprehensive investigation was studied on the effect of the CO2/H2 molar ratio. The CO2 conversion showed a decreasing trend with increasing CO2/H2 molar ratio, whereas CO2 conversion rate exhibited an opposite tendency. The conversion of CO2 was predominantly governed by vibrational excitations induced through electron collisions. The energy loss fractions for CO2 reactions were identified as the primary contributor to energy consumption in higher CO2/H2 ratio range. This phenomenon can be attributed to increase in both E/N and electron energy corresponding to elevated CO2/H2 molar ratio. Furthermore, electron energy, E/N, and gas composition played crucial roles in the plasma chemistry for the CO2 hydrogenation reaction. An increased concentration of CO2 significantly enhanced both E/N and electron energy, thereby facilitating electron excitation reactions and subsequently elevating the CO2 conversion rate.
{"title":"Reaction mechanism of plasma chemistry in CO2 hydrogenation: The effect of CO2/H2 ratio","authors":"Kai Li , Peng Teng , Ruiquan Fei , Zhiqiang Lu , Liancheng Zhang , Xuming Zhang","doi":"10.1016/j.elstat.2024.104017","DOIUrl":"10.1016/j.elstat.2024.104017","url":null,"abstract":"<div><div>CO<sub>2</sub> hydrogenation reaction was conducted in dielectric barrier discharge plasma at ambient condition. A comprehensive investigation was studied on the effect of the CO<sub>2</sub>/H<sub>2</sub> molar ratio. The CO<sub>2</sub> conversion showed a decreasing trend with increasing CO<sub>2</sub>/H<sub>2</sub> molar ratio, whereas CO<sub>2</sub> conversion rate exhibited an opposite tendency. The conversion of CO<sub>2</sub> was predominantly governed by vibrational excitations induced through electron collisions. The energy loss fractions for CO<sub>2</sub> reactions were identified as the primary contributor to energy consumption in higher CO<sub>2</sub>/H<sub>2</sub> ratio range. This phenomenon can be attributed to increase in both E/N and electron energy corresponding to elevated CO<sub>2</sub>/H<sub>2</sub> molar ratio. Furthermore, electron energy, E/N, and gas composition played crucial roles in the plasma chemistry for the CO<sub>2</sub> hydrogenation reaction. An increased concentration of CO<sub>2</sub> significantly enhanced both E/N and electron energy, thereby facilitating electron excitation reactions and subsequently elevating the CO<sub>2</sub> conversion rate.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"134 ","pages":"Article 104017"},"PeriodicalIF":1.9,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143136182","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}
Pub Date : 2024-11-28DOI: 10.1016/j.elstat.2024.104003
Xinjun Shen , Fan He , Jing Zhang , Cong Wang
Atrazine (ATZ) is a synthetic triazine herbicide and has become a new pollutant in environment water. In this study, a multi-high-voltage, double-grounded- pole dielectric barrier discharge (DBD) reactor was designed to degrade ATZ in water. The effects of different factors, such as input voltage, air flow rate, and pH, on the degradation of ATZ in the DBD reactor were compared using response surface methodology. The optimal reaction conditions for the degradation of ATZ by DBD were determined by fitting the model to the experiment: air flow rate of 100 L/h, input voltage of 32 kV and pH of 10. The degradation efficiency obtained was 97.89 %, which closely matched the simulation, indicating that the model had good correlation and consistency with the measured data. In this experiment, catalysts such as activated carbon loaded with CuO and Fe2O3 were added to DBD reactor to improve the utilization of active substances and enhance the degradation of ATZ. The catalysts were characterized by FT-IR, XRD, XPS and SEM, proving that they promoted the degradation of ATZ.
{"title":"Optimisation of CuO/AC, Fe2O3/AC synergistic multi-electrode DBD reactor for degradation of ATZ in water","authors":"Xinjun Shen , Fan He , Jing Zhang , Cong Wang","doi":"10.1016/j.elstat.2024.104003","DOIUrl":"10.1016/j.elstat.2024.104003","url":null,"abstract":"<div><div>Atrazine (ATZ) is a synthetic triazine herbicide and has become a new pollutant in environment water. In this study, a multi-high-voltage, double-grounded- pole dielectric barrier discharge (DBD) reactor was designed to degrade ATZ in water. The effects of different factors, such as input voltage, air flow rate, and pH, on the degradation of ATZ in the DBD reactor were compared using response surface methodology. The optimal reaction conditions for the degradation of ATZ by DBD were determined by fitting the model to the experiment: air flow rate of 100 L/h, input voltage of 32 kV and pH of 10. The degradation efficiency obtained was 97.89 %, which closely matched the simulation, indicating that the model had good correlation and consistency with the measured data. In this experiment, catalysts such as activated carbon loaded with CuO and Fe<sub>2</sub>O<sub>3</sub> were added to DBD reactor to improve the utilization of active substances and enhance the degradation of ATZ. The catalysts were characterized by FT-IR, XRD, XPS and SEM, proving that they promoted the degradation of ATZ.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"133 ","pages":"Article 104003"},"PeriodicalIF":1.9,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722611","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}
Pub Date : 2024-11-26DOI: 10.1016/j.elstat.2024.103993
Chris Lawn
A framework has been developed for computing the tribocharging of particles while they are being conveyed pneumatically through high-velocity circular pipes. Fully-developed flow and particle conditions are considered. With four compositions of particle ranging from nanometre sizes to 100 μm, the radial electrostatic field induced by the space charge of all the particles was approximated, and then updated with the different radial distributions. Simple models for the response of the particles to turbulence, for the radial drift induced by the electrostatic field, for inter-particle collisions, and for the asymptotic charging at the wall were developed. For particle numbers totalling 3x109/m3, it was shown that collisions can be ignored. Large differences in the radial number density distributions for different particle sizes were found, from uniformity for those under about 5 μm, to heavy concentration at the wall for the larger ones.
{"title":"Triboelectric charging of polydisperse particles in a developed pipe flow","authors":"Chris Lawn","doi":"10.1016/j.elstat.2024.103993","DOIUrl":"10.1016/j.elstat.2024.103993","url":null,"abstract":"<div><div>A framework has been developed for computing the tribocharging of particles while they are being conveyed pneumatically through high-velocity circular pipes. Fully-developed flow and particle conditions are considered. With four compositions of particle ranging from nanometre sizes to 100 μm, the radial electrostatic field induced by the space charge of all the particles was approximated, and then updated with the different radial distributions. Simple models for the response of the particles to turbulence, for the radial drift induced by the electrostatic field, for inter-particle collisions, and for the asymptotic charging at the wall were developed. For particle numbers totalling 3x10<sup>9</sup>/m<sup>3</sup>, it was shown that collisions can be ignored. Large differences in the radial number density distributions for different particle sizes were found, from uniformity for those under about 5 μm, to heavy concentration at the wall for the larger ones.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"133 ","pages":"Article 103993"},"PeriodicalIF":1.9,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-26DOI: 10.1016/j.elstat.2024.103995
Luwen Song , Shulin Liu , Dangshu Wang
Explosion-proof electrical equipment must be tested with the spark test apparatus (STA). This discharge was important for electrical explosion-proof safety. This study aimed to investigate the effect of field emission on the contact spark of the STA. Results show that the primary discharge modes were field emission and electron impact ionization. The gap width was estimated to be 6–8 μm. The distribution of the ions and radicals were revealed under the different field emissions. The impact of radicals on ignition was also discussed.
防爆电气设备必须使用火花测试仪器(STA)进行测试。这种放电对电气防爆安全非常重要。本研究旨在调查场发射对 STA 接触火花的影响。结果表明,主要的放电模式是场发射和电子撞击电离。间隙宽度估计为 6-8 μm。在不同的场发射下,离子和自由基的分布也不同。还讨论了自由基对点火的影响。
{"title":"Effect of field emission on contact spark in the spark test apparatus","authors":"Luwen Song , Shulin Liu , Dangshu Wang","doi":"10.1016/j.elstat.2024.103995","DOIUrl":"10.1016/j.elstat.2024.103995","url":null,"abstract":"<div><div>Explosion-proof electrical equipment must be tested with the spark test apparatus (STA). This discharge was important for electrical explosion-proof safety. This study aimed to investigate the effect of field emission on the contact spark of the STA. Results show that the primary discharge modes were field emission and electron impact ionization. The gap width was estimated to be 6–8 μm. The distribution of the ions and radicals were revealed under the different field emissions. The impact of radicals on ignition was also discussed.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"133 ","pages":"Article 103995"},"PeriodicalIF":1.9,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722649","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}
The work is entitled to address an integrated solution for mathematical basis of space charge formation in dielectrics having a finite conductivity. The solution is a manifestation of a more fundamental usage of Gauss Divergence theorem in point form along with continuity equation to take care of the charge dynamics in a temporally changing field condition. The outlook of the work involves the more generalised solution of any space charge problem without sacrificing the intricacies of Maxwell’s Equations.
{"title":"A theoretical approach towards developing space charge formation in lossy dielectrics","authors":"Navdeep Batish, Sounak Nandi, Harimurugan Devarajan","doi":"10.1016/j.elstat.2024.103989","DOIUrl":"10.1016/j.elstat.2024.103989","url":null,"abstract":"<div><div>The work is entitled to address an integrated solution for mathematical basis of space charge formation in dielectrics having a finite conductivity. The solution is a manifestation of a more fundamental usage of Gauss Divergence theorem in point form along with continuity equation to take care of the charge dynamics in a temporally changing field condition. The outlook of the work involves the more generalised solution of any space charge problem without sacrificing the intricacies of Maxwell’s Equations.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"133 ","pages":"Article 103989"},"PeriodicalIF":1.9,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699697","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}
The study investigate water-salt interactions in porous media under electroosmosis. A theoretical model was developed to analyze the effect of salt precipitation on electrical conductivity, permeability, and volumetric capacitance, and to introduce precipitated salt parameters. The model describes water and salt transport through two mass conservation equations and incorporates the charge conservation equation. The model was validated through experiments of other scholars. The experimental results show that salt precipitation and dissolution play an important role in electrical conductivity since salt precipitation decreases drainage efficiency because it reduces hydraulic conductivity. The increase in conductivity of the solution is more important than the decrease in hydraulic conductivity due to salt precipitation because the higher the concentration of the solution, the higher its conductivity. The model suggests that salt plays an important role in electrical conductivity, as evidenced by the prominent nonlinear change in conductivity due to the inhomogeneous transport of solutes. The numerical model helps to predict water and salt transport in the electroosmosis of soils containing saline water.
{"title":"Numerical study on water and salt transport of electroosmosis in saline soil","authors":"Wei Wen , Hao Wu , Ling Zeng , Yiyun Jiang , Haitao Yang , Xubin Huang","doi":"10.1016/j.elstat.2024.103992","DOIUrl":"10.1016/j.elstat.2024.103992","url":null,"abstract":"<div><div>The study investigate water-salt interactions in porous media under electroosmosis. A theoretical model was developed to analyze the effect of salt precipitation on electrical conductivity, permeability, and volumetric capacitance, and to introduce precipitated salt parameters. The model describes water and salt transport through two mass conservation equations and incorporates the charge conservation equation. The model was validated through experiments of other scholars. The experimental results show that salt precipitation and dissolution play an important role in electrical conductivity since salt precipitation decreases drainage efficiency because it reduces hydraulic conductivity. The increase in conductivity of the solution is more important than the decrease in hydraulic conductivity due to salt precipitation because the higher the concentration of the solution, the higher its conductivity. The model suggests that salt plays an important role in electrical conductivity, as evidenced by the prominent nonlinear change in conductivity due to the inhomogeneous transport of solutes. The numerical model helps to predict water and salt transport in the electroosmosis of soils containing saline water.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"132 ","pages":"Article 103992"},"PeriodicalIF":1.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705148","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}
Pub Date : 2024-11-13DOI: 10.1016/j.elstat.2024.103991
V. Berry , L. Zheng , P. Leblanc , S. Holé , T. Paillat
When a liquid contacts a solid, physicochemical reactions form an electrical double layer (EDL) at the interface. Understanding the EDL is crucial to prevent electrical device failures, but few experimental methods can access this charge distribution. Recently, the pressure wave propagation (PWP) method has been explored. This paper presents simulations of current generated by a pressure wave through the EDL using the finite difference time domain (FDTD) method. A parametric study investigates the effects of EDL parameters and stimulus properties on the signal. Simulations with EDL data obtained experimentally for both conductive and dielectric liquids are carried out.
{"title":"Numerical investigation of electric charge measurement by PWP method at solid and liquid interfaces","authors":"V. Berry , L. Zheng , P. Leblanc , S. Holé , T. Paillat","doi":"10.1016/j.elstat.2024.103991","DOIUrl":"10.1016/j.elstat.2024.103991","url":null,"abstract":"<div><div>When a liquid contacts a solid, physicochemical reactions form an electrical double layer (EDL) at the interface. Understanding the EDL is crucial to prevent electrical device failures, but few experimental methods can access this charge distribution. Recently, the pressure wave propagation (PWP) method has been explored. This paper presents simulations of current generated by a pressure wave through the EDL using the finite difference time domain (FDTD) method. A parametric study investigates the effects of EDL parameters and stimulus properties on the signal. Simulations with EDL data obtained experimentally for both conductive and dielectric liquids are carried out.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":"132 ","pages":"Article 103991"},"PeriodicalIF":1.9,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}