Electric current density distribution over the electrode surface of an autonomous electric stimulator of the gastrointestinal tract

1996 ◽  
Vol 30 (5) ◽  
pp. 275-279
Author(s):  
V. F. Agafonnikov ◽  
O. I. Nalesnik ◽  
M. N. Romanovskii
Keyword(s):  
Gastrointestinal Tract ◽  
Density Distribution ◽  
Electric Current ◽  
Current Density ◽  
Electrode Surface ◽  
Current Density Distribution ◽  
Electric Current Density ◽  
Electric Stimulator

Improving Performance of Laser and Shaped Tube Electrochemical Machining by Using Retracted Hybrid Tubular Tool Electrode

2021 ◽  
Author(s):  
yong yang ◽  
yufeng wang ◽  
Yujie Gui ◽  
Fuhui Shao ◽  
Yulei Li ◽  
...  
Keyword(s):  
Density Distribution ◽  
Electric Current ◽  
Current Density ◽  
Feeding Rate ◽  
Electrochemical Machining ◽  
Current Density Distribution ◽  
Electric Current Density ◽  
Tool Electrode ◽  
Shaped Tube ◽  
Tubular Electrode

Abstract The coaxial laser has been introduced to shaped tube electrochemical machining (STEM), referred to as Laser-STEM, to enhance the materials removal rate and precision. To address the issue of central residual formation during the Laser-STEM process, which limited the machining stability and feeding rate, the retracted hybrid tubular electrode was applied. The formation mechanisms and effects of the W-shaped central residual were analyzed. Simulation and experiments were conducted to study the impact of the retracted length of the tubular electrode. Simulation results showed that a retracted length of 1-1.5 mm of the inner low-refractive layer could improve the electric current density distribution homogeneity to remove the W-shaped central residual in the machining area. The electric current density distribution homogeneity in the machining zone has been decreased by 38% by utilizing the hybrid tubular electrode with a retracted length of 2.0 mm. With a proper retracted length, the laser coupling efficiency exceeded 74.5%. Hence, the retracted hybrid tubular electrode could act as both the tool electrode and optical waveguide in the Laser-STEM process. Experimental results proved that the machining efficiency and precision of Laser-STEM could be enhanced by utilizing the retracted hybrid tubular electrode. With the retracted length deg rising from 0 mm to 1.5 mm, the maximum feeding speed increased by 373%, and the machining precision was improved by 42.2%. The maximum feeding rate of 4.1 mm/min has been achieved using the retracted hybrid tubular electrode in the Laser-STEM process, which has been improved by 105%, compared with the available maximum feeding rate of the tubular electrode in the STEM process. Finally, the small holes with a diameter of 1.4 mm and an aspect ratio of 15 have been processed by Laser-STEM with the retracted hybrid tubular electrode.

scholarly journals Global Solar Free Magnetic Energy and Electric Current Density Distribution of Carrington Rotation 2124

Solar Physics ◽  
2014 ◽  
Vol 289 (11) ◽  
pp. 4031-4045 ◽  
Author(s):  
Tilaye Tadesse ◽  
Alexei A. Pevtsov ◽  
T. Wiegelmann ◽  
P. J. MacNeice ◽  
S. Gosain
Keyword(s):  
Density Distribution ◽  
Electric Current ◽  
Current Density ◽  
Magnetic Energy ◽  
Current Density Distribution ◽  
Electric Current Density ◽  
Carrington Rotation ◽  
Free Magnetic Energy

Electric current density distribution in planar solid tumor and its surrounding healthy tissue generated by an electrode elliptic array used in electrotherapy

2010 ◽  
Vol 80 (9) ◽  
pp. 1886-1902 ◽  
Author(s):  
Andrés Ramírez Aguilera ◽  
Luis Enrique Bergues Cabrales ◽  
Héctor Manuel Camué Ciria ◽  
Yudelmis Soler Pérez ◽  
Fidel Gilart González ◽  
...  
Keyword(s):  
Density Distribution ◽  
Electric Current ◽  
Current Density ◽  
Solid Tumor ◽  
Current Density Distribution ◽  
Healthy Tissue ◽  
Electric Current Density ◽  
Surrounding Healthy Tissue

Analysis of TIG Welding Arc Using Boundary-Fitted Coordinates

1995 ◽  
Vol 209 (2) ◽  
pp. 153-164 ◽  
Author(s):  
S-Y Lee ◽  
S-J Na
Keyword(s):  
Density Distribution ◽  
Current Density ◽  
Electrode Surface ◽  
Current Density Distribution ◽  
Tig Welding ◽  
Geometric Transformation ◽  
Computational Domain ◽  
Central Difference ◽  
Computational Region ◽  
Electrode Shape

The characteristics of argon arc in tungsten inert gas (TIG) welding have been studied by considering the electrode shape which has an effect on the current density distribution near the electrode tip. For including the electrode surface configuration into the solution domain, the boundary-fitted coordinate system was employed. Then, a non-rectangular computational region in the physical domain was transformed into a rectangular area with uniformly spaced grids in the computational domain using the second-order central difference method. With the geometric transformation coefficients, the finite difference equations were derived in the computational transformed domain. As the most critical boundary condition, the normal current density distribution entering an electrode surface was postulated by the Gaussian distribution in consideration of the geometry of the electrode shape. For examining the simulated results, the temperature profile was compared with the experimental measurement of the previous research. The transferring phenomena on the base plate, such as current density, heat flux, arc pressure and drag force, were also calculated, because they are necessary data for analysing the molten pool during welding.

Sign in / Sign up

Export Citation Format

Share Document