Abstract
As small solid particles are mixed in gas flow in a horizontal pipe, the particles are sometimes long suspended downstream due to dynamic interaction between two phases in turbulent states. Dunes of such particles are naturally formed at the bottom of the pipe in case of heavy flow rate of particles, and the dunes rather help the particles with suspension further downstream. In this study, PTV has been applied for measurement of such particles floating inside a horizontal pipe behind a synthetic dune. Time-resolved PTV analysis of the particle behavior in the section perpendicular to the mainstream has revealed that long-suspended particles keep floating with fountain like convection pattern inside the circular pipe, which consists of ascending flow at the center of the pipe, bouncing flow at the wall, and downwash at the oblique part. The present paper shows their dynamic statistics of the particle behavior for the cross-sectional distributions of concentration, velocity vector, and acceleration vector.
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