The Euler-Euler/RANS approach is used to simulate the particle suspension in solid–liquid stirred vessels, with experimental validation conducted through the Electrical Sensing Zone Method (ESZ). An innovative evaluation method is introduced to quantify the critical impeller speed required for particles to achieve a specific uniform suspension state in dilute solutions. The impact of different vessel bottom shapes (flat, round, and W-shaped) on particle suspension characteristics is examined. The results indicate that optimizing the bottom shape to align with flow streamlines markedly enhances particle suspension, a conclusion supported by the Online Micro-sized Particle Analyzer (OMiPA). Further analysis shows baffle configurations transform tangential and axial velocities into radial velocity, which is not conducive to providing initial conditions for particle suspension. Overall, effective particle suspension relies on the interaction between main flow and turbulent fluctuations, with tangential and radial flows playing critical roles.

中文翻译：

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搅拌容器结构对稀溶液中颗粒悬浮特性影响的数值模拟研究


Euler-Euler/RANS 方法用于模拟固液搅拌容器中的颗粒悬浮液，并通过电传感区法 (ESZ) 进行实验验证。引入了一种创新的评估方法来量化颗粒在稀溶液中达到特定均匀悬浮状态所需的临界叶轮速度。研究了不同容器底部形状（平坦、圆形和 W 形）对颗粒悬浮特性的影响。结果表明，优化底部形状以与流动流线对齐可显着增强颗粒悬浮性，这一结论得到了在线微型颗粒分析仪 (OMiPA) 的支持。进一步分析表明，挡板结构将切向和轴向速度转化为径向速度，不利于为颗粒悬浮提供初始条件。总体而言，有效的颗粒悬浮依赖于主流和湍流脉动之间的相互作用，其中切向流和径向流起着关键作用。