The Measurement of Net Space Charge Density Using Air Filtration Methods

1985 ◽  
Vol PAS-104 (4) ◽  
pp. 971-976 ◽  
Author(s):  
R. McKnight
Keyword(s):  
Charge Density ◽  
Space Charge ◽  
Space Charge Density ◽  
Air Filtration

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.

Bond metallicity of materials from real space charge density distributions

2009 ◽  
Vol 471 (1-3) ◽  
pp. 174-177 ◽  
Author(s):  
S. Jenkins ◽  
P.W. Ayers ◽  
S.R. Kirk ◽  
P. Mori-Sánchez ◽  
A. Martín Pendás
Keyword(s):  
Charge Density ◽  
Space Charge ◽  
Real Space ◽  
Space Charge Density ◽  
Density Distributions

scholarly journals Studies of an artificially generated electrode effect at ground level

1996 ◽  
Vol 14 (10) ◽  
pp. 1095-1101 ◽  
Author(s):  
E. A. Mareev ◽  
S. Israelsson ◽  
E. Knudsen ◽  
A. V. Kalinin ◽  
M. M. Novozhenov
Keyword(s):  
Wind Speed ◽  
Charge Density ◽  
Space Charge ◽  
Turbulent Mixing ◽  
Ground Surface ◽  
Ground Level ◽  
Space Charge Density ◽  
Experimental Conditions ◽  
Electrical Field Strength ◽  
Electrode Effect

Abstract. The outdoor experiments, using a metallic grid above the ground surface, have yielded well-defined vertical profiles of the space-charge density. The profiles showed strong evidence for the existence of an electrode effect, which could be named the artificial electrode effect and can serve as a very useful and well-controlled model for the study of atmospheric electric processes in the atmospheric surface layer. The build-up or break-down of an electrode-effect layer occurred in a time of the order of 10 s under the experimental conditions realized. The artificially generated electrode effect is dependent on the electrical field strength supplied, wind speed, turbulent mixing and ion mobilities. Wind speed and ion mobility seem to be the dominant factors, defining space-charge density profiles. A theoretical model for the artificial electrode effect has been developed, taking into account turbulent mixing of charged particles in the air flow with the logarithmic profile of the wind velocity. The numerical analysis of the boundary value problem for the two-dimensional equations for the light ion concentrations has been performed. The model presented shows a qualitative agreement of calculated space-charge profiles with measured ones, and explains the dependence of the artificial electrode effect on the dominant control parameters. The limiting conditions for the developed theory are discussed.

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