scholarly journals Three-dimensional computer models of electrospinning systems

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 777-789 ◽  
Author(s):  
Krzysztof Smółka ◽  
Anna Firych-Nowacka ◽  
Marcin Lefik
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Numerical Models ◽  
Three Dimensional ◽  
Computer Models

AbstractElectrospinning is a very interesting method that allows the fabrication of continuous fibers with diameters down to a few nanometers. This paper presents an overview of electrospinning systems as well as their comparison using proposed three-dimensional parameterized numerical models. The presented solutions allow an analysis of the electric field distribution.

scholarly journals Influence of Partial Arc on Electric Field Distribution of Insulator Strings for Electrified Railway Catenary

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3295 ◽  
Author(s):  
Shanpeng Zhao ◽  
Chenrui Zhang ◽  
Youpeng Zhang ◽  
Sihua Wang
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Field Intensity ◽  
Electric Field Distribution ◽  
Electrical Breakdown ◽  
Rapid Development ◽  
Three Dimensional ◽  
Local Maximum ◽  
Field Analysis ◽  
Maximum Field

The occurrence of a partial arc can affect insulation properties of the insulator by different types of flashover. In order to investigate the influence of a partial arc on electric field distribution along the catenary insulator string, a three-dimensional model of the cap-pin insulator string with partial arc was established in this paper. The electric field distribution along the insulator string when the arc extended on the insulator surface and bridged sheds was investigated based on the electric field analysis using the finite element method. The results showed that the occurrence of a partial arc caused obvious distortion of the electric field, which was a two-dimensional axis symmetrical field before arcing to a three-dimensional field. In the case of arc extension, the sudden rise of field intensity was mostly at the rib and the shed edge, which had the local maximum field intensity. The rib and the shed edge played a certain hindrance role in the extension of the arc. The main reason for promoting the development of the arc can be attributed to thermal ionization. In the case of arc bridge sheds, the highest field intensity appeared at the edge of the last bridged shed. As the number of sheds arc-bridged increased, the maximum field intensity also increased. As the arc length increased, the electric field intensity of the arc head also increased, which resulted in an accelerated arc development. The main factor to promote the development of the arc can be attributed to electrical breakdown. The measures to hinder the rapid development of partial arcs were proposed.

scholarly journals Finite Element Analysis of Disc Insulator Type and Corona Ring Effect on Electric Field Distribution over 230-kV Insulator Strings

2012 ◽  
Vol 1 (4) ◽  
pp. 407 ◽  
Author(s):  
Ebrahim Akbari ◽  
Mohammad Mirzaie ◽  
Abolfazl Rahimnejad ◽  
Mohammad Bagher Asadpoor
Keyword(s):  
Finite Element ◽  
Electric Field ◽  
Power Systems ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Three Dimensional ◽  
Operation Time ◽  
Voltage Distribution ◽  
Element Analysis ◽  
Phase Conductors

Insulator strings are widely used in power systems for the dual task of mechanically supporting and electrically isolating the live phase conductors from the support tower. However, the electric field and voltage distribution of insulator string is uneven which may easily lead to corona, insulators surface deterioration and even flashover. So the calculation of the electric field and voltage distribution along them is a very important factor in the operation time. Besides, despite the variety of insulator material and profiles, no remarkable endeavor regarding their impacts upon electric field distribution has been made so far. In this paper, three-dimensional Finite Element Method (3-D FEM) softwareMaxwell is employed to simulate several 230-kV insulator strings with various types of porcelain and glass disc insulators and the electric field along them were compared, to investigate the effect of insulator types on electric field distribution.

Non-parallellism of needles in electroporation: 3D computational model and experimental analysis

2019 ◽  
Vol 38 (1) ◽  
pp. 348-361 ◽  
Author(s):  
Luca G. Campana ◽  
Paolo Di Barba ◽  
Fabrizio Dughiero ◽  
Michele Forzan ◽  
Maria Evelina Mognaschi ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Numerical Models ◽  
Electrode Position ◽  
Element Analysis ◽  
Actual Distribution ◽  
Content Type ◽  
The One ◽  
Distribution Of Electric Field

PurposeIn electrochemotherapy, flexible electrodes, composed by an array of needles, are applied to human tissues to treat large surface tumors. The positioning of the needles in the tissue depends on the surface curvature. The parallel needle case is preferred, as their relative inclinations strongly affect the actual distribution of electric field. Nevertheless, in some case, small inclinations are unavoidable. The purpose of this paper is to study the electric field distribution for non-parallel needles.Design/methodology/approachThe effect of electrode position is evaluated systematically by means of numerical models and experiments on phantoms for two different angles (5° and 30°) and compared with the case of parallel needles. Potato model was used as phantom, as this tissue becomes dark after few hours from electroporation. The electroporation degree was gauged from the color changings on the potatoes.FindingsThe distribution of electric field in different needle configuration is found by means of finite element analysis (FEA) and experiments on potatoes. The electric field level of inclined needles was compared with parallel needle case. In particular, the electric field distribution in the case of inclined needles could be very different with respect to the one in the case of parallel needles. The degree of enhancement for different inclinations is visualized by potato color intensity. The FEA suggested that the needle parallelism has to be maintained as possible as if the tips are closer to each other, the electric field intensity could be different with respect to the one in the case of parallel needles.Originality/valueThis paper analyzes the effect of inclined electrodes considering also the non-linearity of tissues.

Electric Field Simulation of Typical Defects in the Epoxy/Paper Composites Insulated Tubular Bus

2018 ◽  
Vol 922 ◽  
pp. 157-162 ◽  
Author(s):  
Cheng Lei Li ◽  
Rui Liu ◽  
Peng Hu Li ◽  
Wen Pei Li ◽  
Nai Kui Gao
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Three Dimensional ◽  
Conducting Layer ◽  
Static Electric Field ◽  
Three Dimensional Model ◽  
Actual Structure ◽  
Simulation Results ◽  
Air Void

Many failures had occurred in operation of insulated tubular bus because of the poor product quality, and its primary reason was that some defects were led into the insulation system in the production, then the local electric field would increase and then result in partial discharge, which could accelerate the aging and even breakdown of the materials. In this research, a 1/4 three-dimensional model was established according to the actual structure of insulated tubular bus, and the simulation results obtained from static electric field and quasi-static electric field were compared. Besides, the electric field distribution of insulated tubular bus with typical defects was simulated based on ANSYS software. These three defects were air void, moisture and damage of semi-conducting layer. The simulation results showed that the electric field distribution of insulated tubular bus with typical defects was more suitable with quasi-static electric field simulating. The maximum electric field value was different with different defects, and dependent on the location and size of defects.

CAD/CAE System for Shaping Process of Three Dimensional Complicated Surfaces in Electrochemical Machining

2010 ◽  
Vol 97-101 ◽  
pp. 4061-4065
Author(s):  
Lei Wang
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Computer Aided Design ◽  
Electric Field Distribution ◽  
Three Dimensional ◽  
Electrochemical Machining ◽  
Electrode Gap ◽  
Shaping Process ◽  
Database Technology ◽  
Cae System

The paper presented a computer aided design and engineering (CAD/CAE) system that can be used to simulate and analyse three-dimensional complicated workpiece’s shaping process in electrochemical mahining. In the CAE model the finite element method was applied to analysis the electric-field distribution in inter-electrode gap. Factors affecting the electric-field distribution, such as flow factors and passivating electrolyte, are also taken into account by using database technology. The results of simulation and experiments showed that the system was of high precision.

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