The Variation of Electric Field on the Conductor Surface Characterized by Space Charge Density

2019 ◽  
pp. 282-291
Author(s):  
Ruijin Liao ◽  
Hongbo Liu ◽  
Xuetong Zhao ◽  
Lulu Ren ◽  
Yuandi Lin
Keyword(s):  
Electric Field ◽  
Charge Density ◽  
Space Charge ◽  
Space Charge Density ◽  
Conductor Surface

scholarly journals Reconstructing the electrical structure of dust storms from locally observed electric field data

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Huan Zhang ◽  
You-He Zhou
Keyword(s):  
Electric Field ◽  
Charge Density ◽  
Space Charge ◽  
Charge Separation ◽  
Field Data ◽  
Space Charge Density ◽  
Dust Storms ◽  
Dust Particles ◽  
Electrical Structure ◽  
Separation Mechanisms

Abstract While the electrification of dust storms is known to substantially affect the lifting and transport of dust particles, the electrical structure of dust storms and its underlying charge separation mechanisms are largely unclear. Here we present an inversion method, which is based on the Tikhonov regularization for inverting the electric field data collected in a near-ground observation array, to reconstruct the space-charge density and electric field in dust storms. After verifying the stability, robustness, and accuracy of the inversion procedure, we find that the reconstructed space-charge density exhibits a universal three-dimensional mosaic pattern of oppositely charged regions, probably due to the charge separation by turbulence. Furthermore, there are significant linear relationships between the reconstructed space-charge densities and measured PM10 dust concentrations at each measurement point, suggesting a multi-point large-scale charge equilibrium phenomenon in dust storms. These findings refine our understanding of charge separation mechanisms and particle transport in dust storms.

Study of the Effect of Electrophoresis on Transport of Biomolecules in Microreactors

2011 ◽  
Author(s):  
Sina Jomeh ◽  
Mina Hoorfar
Keyword(s):  
Electric Field ◽  
Charge Density ◽  
Space Charge ◽  
Stokes Equations ◽  
Surface Concentration ◽  
Space Charge Density ◽  
Uniform Electric Field ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Chemical Reaction Kinetics

The effect of electrophoresis (i.e., applying uniform electric field to use the natural charge of particles) on the transport of a sample (like biomolecules) in active microreactors is numerically investigated. Navier-Stokes equations are solved along with the equations of electrostatics, species mass transport in the buffer and chemical reaction kinetics at reactive surfaces. Unlike previous studies, in which the effect of the charge of the sample bulk on the electric field has been neglected (i.e., the assumption of electroneutrality), here space charge density is assumed to be nonzero. As a result, the governing equations become fully coupled. The efficiency of the microreactor device is analyzed for two different geometries commonly used in biomolecule separation (i.e., open channel and microcylinders). It is shown that the electroneutrality assumption can drastically influence the final adsorbed concentration depending on the device configuration. Average adsorbed surface concentration is compared for each case as a measure of the performance of the device. The plots depicting the influence of the electric field and nonzero space charge density on the bulk concentration profile and the velocity field are also presented and discussed.

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