标题： 跟踪湍流中光磁粒子的旋转 显示英文标题

标题： Tracking the rotation of light magnetic particles in turbulence

摘要： 颗粒载流湍流涉及分散相和连续相之间的复杂相互作用。 鉴于颗粒可以表现出多种性质，例如不同的密度、尺寸和形状，它们与流动的相互作用可能导致湍流的各种变化。 因此，理解颗粒的动力学是揭示多相系统行为的必要第一步。 在颗粒动力学的背景下，准确解析旋转运动相比平动运动提出了更大的挑战。 我们提出了一种实验方法，用于跟踪尺寸明显小于泰勒微尺度的球形、轻质和磁性颗粒的旋转运动，通常比其悬浮其中的湍流的科氏尺度大一个数量级。 该方法仅使用单个相机获取的二维图像即可完全解析颗粒角速度的三个分量。 该技术使得能够详细研究同时受到小尺度湍流结构和外部磁力作用的磁性颗粒的旋转动力学。 除了推进湍流中颗粒动力学的研究外，这种方法还为通过外加磁场主动调节湍流开辟了新可能性。 显示英文摘要

摘要： Particle-laden turbulence involves complex interactions between the dispersed and continuous phases. Given that particles can exhibit a wide range of properties, such as varying density, size, and shape, their interplay with the flow can lead to various modifications of the turbulence. Therefore, understanding the dynamics of particles is a necessary first step toward revealing the behavior of the multiphase system. Within the context of particle dynamics, accurately resolving rotational motion presents a significantly greater challenge compared to translational motion. We propose an experimental method to track the rotational motion of spherical, light, and magnetic particles with sizes significantly smaller than the Taylor microscale, typically an order of magnitude larger than the Kolmogorov scale of the turbulence in which they are suspended. The method fully resolves all three components of the particle angular velocity using only 2D images acquired from a single camera. This technique enables a detailed investigation of the rotational dynamics of magnetic particles subjected simultaneously to small-scale turbulent structures and external magnetic forcing. Beyond advancing the study of particle dynamics in turbulence, this approach opens new possibilities for actively modulating turbulence through externally applied magnetic fields.