标题： 近场流体动力学相互作用对靠近固体表面的细菌动力学的影响 显示英文标题

标题： Effects of Near-Field Hydrodynamic Interactions on Bacterial Dynamics Near a Solid Surface

摘要： 细菌与无滑移固体表面之间的近场流体动力相互作用是细菌表面捕获的主要机制。 在本研究中，我们采用手性两体模型来模拟细菌靠近表面时的动力学行为。 模拟结果表明，当细菌接近表面时，它们的平动速度、转动速度以及扩散系数都会降低。 在近场流体动力相互作用和DLVO力的共同作用下，细菌在相平面上达到一个稳定的固定点，并在此点沿圆形轨迹运动。 值得注意的是，具有左旋螺旋鞭毛的细菌在表面上表现出顺时针方向的圆周运动。 在此过程中，随着稳定高度的增加，平行于表面的平动速度增加，而垂直于表面的转动速度减少，从而共同增加了曲率半径。 最终，我们的研究结果表明，近场流体动力相互作用显著延长了细菌在表面的停留时间。 此外，较小的稳定高度进一步增强了这一效应，导致更长的停留时间和更强的表面捕获效果。 显示英文摘要

摘要： Near-field hydrodynamic interactions between bacteria and no-slip solid surfaces are the main mechanism underlying surface entrapment of bacteria. In this study, we employ a chiral two-body model to simulate bacterial dynamics near the surface. The simulation results show that as bacteria approach the surface, their translational and rotational velocities, as well as their diffusion coefficients, decrease. Under the combination of near-field hydrodynamic interactions and DLVO forces, bacteria reach a stable fixed point in the phase plane and follow circular trajectories at this point. Notably, bacteria with left-handed helical flagella exhibit clockwise circular motion on the surface. During this process, as the stable height increases, the translational velocity parallel to the surface increases while the rotational velocity perpendicular to the surface decreases, collectively increasing the radius of curvature. Ultimately, our findings demonstrate that near-field hydrodynamic interactions significantly prolong the surface residence time of bacteria. Additionally, smaller stable heights further amplify this effect, resulting in longer residence times and enhanced surface entrapment.