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<p>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 (<i>Re</i><sub><i>f</i></sub> = 250∼1500) and inflow excitation frequency (<i>f</i><sub>e</sub> = 0∼20 Hz) on particle trajectories and their final states, categorized as removed, re-entrant, or retained. Without excitation, increasing <i>Re</i><sub><i>f</i></sub> 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.</p>

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

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Minh Tam Nguyen,
  • Junyoung Park,
  • Dongjoo Kim

摘要

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 (Ref = 250∼1500) and inflow excitation frequency (fe = 0∼20 Hz) on particle trajectories and their final states, categorized as removed, re-entrant, or retained. Without excitation, increasing Ref 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.