OSCILLATORY ELECTROHYDRODYNAMIC GAS-FLOWS

Prior numerical solutions of electrohydrodynamic flows in a positive-c orona, wire-plate electrostatic precipitator are extended to reveal st eady-periodic electrohydrodynamic flows. Previously, only steady solut ions were reported. The present study includes results for flows with Reynolds numbers from 0 to 4800 and with dimensionless electric number ranging from 0.06 to infinity. Results indicate that two regimes of l ow frequency oscillatory pow occur. The first regime is characterized by a single recirculating vortex that oscillates in strength between o ne and five Hertz. The second regime is characterized by two counter-r otating vortices that oscillate in strength at a frequency near one He rtz.