In this study a theoretical study is carried out on the collision of two rod-like particles suspended in Newtonian fluid under a shear flow. The length of the particle is fixed at 2 µm while the diameter is varied so that the aspect ratio (length/diameter) varies from 1 to 20. Liquid viscosity is changed from 0.01 to 1 Pa·s. The Brownian motion is considered to be negligible. Both hydrodynamic and van der Waals interactions are included in tracking the position and the orientation of each particle. The Hamaker constant is fixed at 1.06 × 10⁻²⁰ J. The result shows that the kinetic constant of coagulation is reduced to approximately 40% of the value for the non-interacting particles when the viscosity is 1 Pa·s. As collision modes, face-edge, side-side, side-edge and edge-edge are considered. The side-edge mode is most frequently observed in the given range of aspect ratio.

中文翻译：

---

杆状颗粒在简单剪切流下的二元碰撞研究

在这项研究中，对在剪切流作用下悬浮在牛顿流体中的两个棒状颗粒的碰撞进行了理论研究。在改变直径的同时，将颗粒的长度固定为2μm，以使纵横比（长度/直径）从1至20变化。液体粘度从0.01至1Pa·s变化。布朗运动被认为可以忽略不计。跟踪每个粒子的位置和方向时都包括了流体动力学和范德华相互作用。Hamaker常数固定为1.06×10 ^-20J.结果表明，当粘度为1Pa·s时，凝结的动力学常数降低到非相互作用颗粒值的约40％。作为碰撞模式，考虑了面部边缘，侧面，侧面边缘和边缘边缘。在给定的纵横比范围内，最常观察到侧边模式。