Donor cell-finite element descriptions of wire-duct precipitator fields, charges, and efficiencies

Corona Performance in Wire-cylinder ESP with Particle Loading

“…With particle loading, it is worthy to notice in Fig. (3) that (i) ρ p assumes values almost one order smaller in magnitude than those of ρ i with particle loading in agreement with previous findings [1] and (ii) the sum ρ p + ρ i with particle loading is almost equal to ρ i without particle loading over the spacing between wire and cylinder. This is because the particles are charged at the expense of ions.…”

“…The model can account for particle loading of the ESP and bipolar ionic species resulting from back-ionization at the collecting electrode [1].…”

A Study on the Electrohydrodynamic Flow in a Rectangular Impactor with Positive Corona Discharge

“…It is convenient to assume that e is located midway between P and E, w midway between W and P, A midway between S and P, and n midway between N and P. The upwind schcme was used to solve the current continuity equation to avoid numerically unstable, whereby space charge density at the grid point outside the control volume is used for faccs for which current leaves the control volume. The direction of current density through an control volume face is determined by the sign of the twopoint diffcrence of the potentials on both sides of the face (Levin and Hoburg, 1990). For example, the component of current dcnsity that enters the control volume from point W to point P is expressed as while the component of current density leaving the control volume from point P to point N is expressed as Therefore, integration of Eq.…”

Electrical field modified by injected space charge in blade-plate configuration

“…The two coupled equations (Poisson equation (1) and charge conservation equation (2), governing the electrical potential and the charge density in the drift zone, are The boundary conditions associated with (1) are of Dirichlet type Const. on the electrodes .…”

“…Levin and Hoburg used FEM to solve Poisson equation and FVM (donor-cell) for the charge equation with unstructured mesh in wire-duct electrostatic precipitator [2]. Butler et al employed FEM and MOC with unstructured mesh in wire-duct configuration and wire-cylinder precipitator.…”