CFD-DEM simulation of the effect of inflow conditions on particle removal in a horizontal channel-cavity configuration

초록

A fully coupled CFD-DEM framework is employed to investigate fluid flow and particle transport in a horizontal channel-cavity configuration, accounting for interactions among fluid, particles, and boundaries. A parametric study examines the effects of Reynolds number (Re f = 250 similar to 1500) and inflow excitation frequency (f e = 0 similar to 20 Hz) on particle trajectories and their final states, categorized as removed, re-entrant, or retained. Without excitation, increasing Re f enhances vortex strength but provides only limited improvement in particle removal, as particles deeper inside the cavity remain less affected. However, harmonic inflow excitation periodically generates new vortices that interact with pre-existing vortices and penetrate deeper into the cavity, markedly enhancing removal. Under the optimal combination of Reynolds number and excitation frequency, nearly complete removal is achieved. A semi-empirical correlation and a removal-ratio map are further developed to summarize the parametric trends and facilitate engineering applications within the present geometric and operating ranges.

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