As the ratio of height-to-width of planar nozzle is less than 1

the planar opposed jets are regarded as two-dimensional impinging streams.A numerical study of gas-solids two-phase planar opposed jets was conducted by using two-fluid model (TFM).It was concluded that periodical oscillation was the main flow regime for large nozzle separation with ratio of particle-to-gas mass flow m≤8.2

particle diameter 60 μm≤dp≤175 μm and ratio of nozzle separation (L) to nozzle height (H) 12—20.This oscillation was resulted from pressure release on the impinging surface and the inertia of incessant axial jets

which was based on the instantaneous and mean distributions of static pressure and velocity at the jet axis.The effects of different simulation conditions on oscillation period were discussed.The period would be increased by enlarging nozzle separation or increasing particle diameters

while the period would be decreased by increasing jet Reynolds number or ratio of particle-to-gas mass flow.