The existence of a quiescent core (QC) in the center of turbulent channel flows was demonstrated in recent experimental and numerical studies. The QC-region, which is characterized by relatively uniform velocity magnitude and weak turbulence levels, occupies about $40\%$ of the cross-section at Reynolds numbers $R{e}_{\tau }$ ranging from 1000 to 4000. The influence of the QC region and its boundaries on transport and accumulation of inertial particles has never been investigated before. Here, we first demonstrate that a QC is unidentifiable at $R{e}_{\tau }=180,$ before an in-depth exploration of particle-laden turbulent channel flow at $R{e}_{\tau }=600$ is performed. The inertial spheres exhibited a tendency to accumulate preferentially in high-speed regions within the QC, i.e. contrary to the well-known concentration in low-speed streaks in the near-wall region. The particle wall-normal distribution, quantified by means of Voronoï volumes and particle number concentrations, varied abruptly across the QC-boundary and vortical flow structures appeared as void areas due to the centrifugal mechanism. The QC-boundary, characterized by a localized strong shear layer, appeared as a barrier, across which transport of inertial particles is hindered. Nevertheless, the statistics conditioned in the QC-frame show that the mean velocity of particles outside of the QC was towards the core, whereas particles within the QC tended to migrate towards the wall. Such upward and downward particle motions are driven by similar motions of fluid parcels. The present results show that the QC exerts a substantial influence on transport and accumulation of inertial particles, which is of practical relevance in high-Reynolds number channel flow.

最近的实验和数值研究表明，在湍流通道中心存在一个静态中心（QC）。QC区域的特征在于速度幅度相对均匀且湍流水平较弱，约占$40％$ 雷诺数处的横截面 $\mathrm{[R}{Ë}_{\tau }$范围从1000到4000。QC区域及其边界对惯性粒子的传输和积累的影响以前从未研究过。在这里，我们首先证明质量控制在$\mathrm{[R}{Ë}_{\tau }=180，$ 在深入探索充满粒子的湍流通道 $\mathrm{[R}{Ë}_{\tau }=600$被执行。惯性球表现出倾向于优先在QC内的高速区域中累积的趋势，即与近壁区域中低速条纹中众所周知的浓度相反。通过Voronoï体积和颗粒数量浓度量化的颗粒壁正态分布，在整个QC边界上突然变化，由于离心机制，涡流结构显示为空隙区域。以局部强剪切层为特征的QC边界似乎是一个障碍，阻碍了惯性粒子的运输。但是，以QC框架为条件的统计数据表明，QC外部粒子的平均速度是朝向核心，而QC内的粒子则倾向于向壁迁移。这种向上和向下的粒子运动是由流体包裹的类似运动驱动的。目前的结果表明，质量控制对惯性粒子的传输和积累起着实质性的影响，这在高雷诺数通道流动中具有实际意义。