液固两相流技术广泛应用于换热器的强化传热设计，其关键在于引导低体积分数颗粒运动至壁面以扰动并破坏附近的热边界层，进而实现强化传热效果。颗粒的运动行为是深入解析传热强化机理的关键因素，其中非球形颗粒因其形状的各向异性而具有更佳的扰动效果以及更为复杂的运动行为。该文以正四面体颗粒群为研究对象，为分析其在立式上行管内液固两相流中的运动分布规律，基于CFD-DEM（计算流体动力学-离散单元模型）耦合方法模拟研究颗粒进口体积分数（1%、2%、3%、4%、5%）和液相进口流速（1.0、1.2、1.5、1.8、2.0 m/s）对管内颗粒群平均速度和颗粒群相对体积分数分布的影响，并通过PIV（粒子图像测速技术）实验验证数值模拟的准确性。结果表明：在研究参数范围内，颗粒群平均速度沿轴向波动，波动幅度随进口流速的增大而加剧，沿径向由中心至管壁递减，分布随流体轴向的充分发展而越发集中；颗粒群相对体积分数沿径向遵循管中心区域和近壁面较高、过渡区域较低的双峰规律；颗粒进口体积分数为1%、液相进口流速为2.0 m/s时，管壁附近的颗粒体积分数最高。

Liquid-solid two-phase flow technology is widely applied to the heat transfer enhancement in heat exchanger design, the key lies in guiding low-volume-fraction particles to the wall region to disrupt the thermal boundary layer and thereby improve the heat transfer efficiency. The movement behavior of particles is a key factor for deep analysis of heat transfer enhancement mechanism. Non-spherical particles have better disturbance effects and more complex movement behaviors due to the anisotropy of their shapes. This paper takes regular tetrahedral particle groups as the research subject to analyze their motion and distribution law in liquid-solid two-phase flow in vertical uppipe. In the investigation, the effects of particle inlet volume fraction (1%, 2%, 3%, 4% and 5%) and liquid inlet velocity (1.0, 1.2, 1.5, 1.8 and 2.0 m/s) on the average velocity and relative volume fraction distribution of particle groups in tubes are simulated based on CFD-DEM (Computational Fluid Dynamics-Discrete Element Model) coupling method, and the accuracy of the numerical simulation is verified by PIV (Particle Image Veloci-metry) experiments. The results show that, within the studied parameter range, the average velocity of particle groups exhibits axial fluctuations, with a fluctuation amplitude intensifying as the liquid inlet velocity increases, and decreases radially from the pipe center to the wall. Furthermore, the velocity distribution becomes increasingly centralized as the fluid flow develops axially. Along the radial direction, the relative volume fraction of particles follows the double peak law, that is, being higher in the central area and near the wall of the tube, while being lower in the transition area. When the particle inlet volume fraction is 1% and the liquid inlet velocity is 2.0 m/s, the particle volume fraction near the pipe wall is the highest.