| 摘 要: 基于声表面波微流控技术，提出了利用兰姆波在基板上驱动液滴运动的模型。首先分析了声表面波驱动理论，得到液滴声流力的表达式，并计算了该模型中兰姆波所激发的声流力大小；然后在COMSOL Multiphysics多物理仿真软件中建立了两相流仿真模型，模拟了液滴在基板表面的瞬态运动行为，且通过实验校验了仿真结果；最后基于该仿真模型，探究了液滴密度、动力黏度和表面张力对位移特性的影响。结果表明：液滴的位移特性主要受动力黏度的影响，这为分离微、纳量级下不同黏度的微流体提供了一定的理论指导。 |
| 关键词: 声表面波；液滴；仿真；COMSOL Multiphysics |
|
中图分类号: TP391.9
文献标识码: A
|
| 基金项目: 国家自然科学基金资助项目((51505274)；上海市“晨光计划”基金资助项目(15CG58)；上海市青年东方学者基金资助项目(QD2015036). |
|
| Simulation Analysis and Experimental Study of Droplet Driving Model based on COMSOL |
|
CHEN Hongan, LIANG Wei
|
(School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China )
hongan_chen@foxmail.com; wei.liang@sues.edu.cn
|
| Abstract: This paper proposes a model for driving droplet motion on a substrate with Lamb waves based on SAW (Surface Acoustic Wave) microfluidic technology. Firstly, SAW driving theory is analyzed to obtain an expression for acoustic stream forces of droplets, and the magnitude of the acoustic stream force excited by the Lamb wave in the model is calculated. Then, a two-phase flow simulation model is established in the COMSOL Multiphysics simulation software, where the transient motion behavior of droplets on the surface of the substrate is simulated and the simulation results are verified by experiments. Finally, based on the simulation model, the effects of droplet density, dynamic viscosity and surface tension on the displacement characteristics are explored. Results show that the displacement characteristics of droplets are mainly affected by the dynamic viscosity, which provides a certain theoretical guidance for the separation of microfluidics with different viscosities at micro- and Nano-scales. |
| Keywords: SAW; droplet; simulation; COMSOL Multiphysics |
