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An approach for modeling the space charge density and the electric field distribution in electrostatic precipitators is presented. Two numerical techniques are used iteratively until a self-consistent solution is obtained: the boundary element method, for evaluation of the electric potential, and the characteristic method, determining the charge… (More)

In this paper, a numerical algorithm for the simulation of the dynamic corona discharge in air is proposed assuming single-species charge carriers. The simulation results show the behavior of corona current and space-charge density under two waveforms of the applied voltage: step and pulse. The electric field is calculated by means of the finite-element… (More)

This paper presents a new dynamic model for the negative corona discharge in the point-plane geometry. The hybrid boundary-element-finite-element method technique is used to calculate the electric-field parameters, and the method of characteristics is employed for the charge-transport prediction. The simulation results show the charge-density distributions… (More)

The effect of airflow, including the electrohydrodynamic (EHD) flow produced by the electric corona discharge, and the flow generated externally on the corona discharge has been investigated numerically in this paper. Contrary to the common assumption that the corona discharge and the EHD flow can be decoupled by neglecting the convection term in the… (More)

An iterative numerical algorithm for simulating particle trajectories in the tribo-charge powder coating process is presented in the paper. The electric field distribution is determined by means of the finite element method. The particle trajectories are predicted by integrating the differential equation of motion, resulting from the Newton equation. The… (More)

This paper presents the numerical study of the effect of electrohydrodynamic (EHD) flow on corona discharge in a pin-plate system in compressed air (pressures of 1-60 atm). The coupled electric and gas flow fields were simultaneously solved by using the commercial CFD FLUENT software. A hybrid numerical algorithm based on the boundary-element method, the… (More)

Distortion of a free droplet in a uniform electric field is studied numerically using the boundary element method. It is assumed that the droplet is made of an ideally conducting liquid. There exists a critical magnitude of the electric field intensity. The droplet oscillates for weaker electric fields and elongates until a thin jet emanating from the… (More)

In the present paper, a single-stage axisymmetric conduction micropump in the vertical configuration has been proposed. This micropump consists of four components: high voltage ring electrode, grounded disk-shaped electrode, insulator spacer, and inlet/outlet ports. The high-voltage electrode and grounded electrode of the device were patterned on the two… (More)

The effect of airflow, including the electrohydrodynamic (EHD) flow produced by the electric corona discharge, and the flow generated externally on the corona discharge has been investigated numerically in this paper. Contrary to the common assumption that the corona discharge and the EHD flow can be decoupled by neglecting the convection term in the… (More)

Despite the common belief that, in the process of induction charging, the actual charging time constant and the material-based relaxation time constant are equal, there is no proof that these parameters are related at all. The purpose of this paper is to determine the actual induction charging time constant for practical types of particles having both… (More)