Abstract
In earlier studies of gas-particle flows the effect of wall roughness was not taken into account. The present author and his colleagues did detailed PDPA measurements and numerical studies for the effect of wall roughness on the gas-particle flow behavior. This paper gives a review of our studies, showing the following results. The PDPA measurements of backward-facing step gas-particle flows shows that as the wall roughness increases, the longitudinal and transverse particle fluctuation velocities increase. The numerical simulation of swirling gas-particle flows shows that the simulation results accounting for the wall roughness agree well with the measurement results. The numerical simulation of gas-particle channel flows indicates the increase of particle fluctuation velocity with increasing wall roughness.
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