考虑热扰动效应的微纳颗粒动力学行为的数值模拟研究

The motion law and the mutual acting force between particles is widely involved in mechanics of fluid, mechanics of colloid, micro/nano observation and processing technology, biological medicine, air pollution control, water treatment engineering and other fields. However, people do not fully understand these interaction forces and law, especially for the micro-nano particles under the thermal disturbance that has become one of the key content of micro-nano particle dynamics research. This project aims to study the influence of thermal disturbance on the micro/nano particles that involved in the interaction force using the Microscope technique , which considering the complex environment conditions, such as humidity, temperature, wind speed, and the different particles conditions, such as different characteristics, different shape, different separation distance. The molecular dynamics simulation method is used to calibrate the key parameters, and Microscopic technique is used to measure micro particle interaction to prove the validity of the equation and dynamics model. The project is focused on the influence of the thermal disturbance effect on the interaction force between the micro - nano particle. It is has an important practical and theoretical significance to strengthen the study of microscope manipulation technology, medical nanoparticles and cells, flocculation of particle in the waster water and haze formation and control. Research on micro/nano scale particles microscopic force can also promote the improvement of the granular material mechanics.

基于各种微纳米尺度颗粒之间相互作用力及其的运动规律广泛涉及到流体力学、胶体力学、微纳米观测和加工技术、生物医学和大气污染与防治和水处理工程等领域。然而，人们并不完全理解这些相互作用及规律，尤其鲜有涉及在自然环境下微纳颗粒在热扰动作用下的相互作用微观力规律，后者成为研究微纳颗粒动力学的关键内容之一。我们计划建立颗粒在空气中的运动方程，旨在研究在带有热扰动影响的真实环境（湿度、温度、风速等条件）中的微纳颗粒间（例如不同特性、不同形状、不同间距等复杂情况下）相互作用力变化规律，并用分子动力学模拟方法校正参数，用显微镜技术测量颗粒微观相互作用力验证方程的正确性，建立正确的室内悬浮细颗粒物微观动力学模型。本项目聚焦在微纳颗粒间相互作用力中的热扰动效应的影响，对于深入认识显微镜操纵技术、医学纳米颗粒与细胞、废水颗粒物的絮凝以及理解雾霾细粒子的形成和沉降控制的物理机制等具有重要理论意义。

微纳米颗粒的运动是受各种微观作用力的综合结果，其中热扰动产生的随机力的影响至关重要。本项目采用布朗动力学方法和微纳米力学理论，从单个球形微纳米颗粒入手，建立微纳米颗粒空气动力学模型，数值计算模拟微纳米颗粒碰撞、以及颗粒间相互运动过程，分析颗粒运动轨迹和速度的规律。揭示微纳米颗粒在自然条件下(湿度、风力、温度等)形成悬浮/沉降的物理机制。