| 微通道中液滴和粒子的运动特性研究 |
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| 引用本文： | 王翔,逄燕,申峰,刘赵淼.微通道中液滴和粒子的运动特性研究[J].实验流体力学,2020,34(2):25-38. |
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| 作者姓名： | 王翔 逄燕 申峰 刘赵淼 |
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| 作者单位： | 北京工业大学 机械工程与应用电子技术学院, 北京 100124 |
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| 摘 要： | 微流控技术的快速发展反映了新型检测器件对微型化和集成化的要求，以及当前科学研究和工程应用逐步向多学科交叉领域过渡的趋势。其中，液滴和粒子是微流控技术中两种重要的操控对象。液滴和粒子的微尺度流动通常处于层流范围，然而尺度效应和界面效应将非线性因素引入流动，且受到通道结构、流动条件等多个控制参数的耦合影响，使得微尺度系统表现出多种复杂的流动现象。因此，从流体动力学的机理研究出发揭示微尺度流动的物理机制至关重要。本文综述了课题组近年来关于微通道中液滴和粒子运动的研究，分析了液滴/粒子特征参数的变化规律，界定了不同流动模式的分布状况及临界条件，明确了主导流动的关键参数并建立了相应的受力模型，以期探寻不同行为的操控方法。本文工作可为微尺度下复杂流动理论体系的完善及相关工程应用提供参考。
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| 关 键 词： | 微流动 多相流动 液滴 粒子 运动特性 |
| 收稿时间： | 2019-10-22 |
Study on behaviors of droplets and particles within microchannels |
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| Affiliation: | College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | The requirements for miniaturization and integration of new detection devices as well as the demands for interdisciplinary manipulation platform by current scientific researches and engineering applications prompt the rapid development of microfluidics. Droplet and particle are two important targets that are manipulated by microfluidics, which usually works at the laminar flow domain. Nonlinear factors are introduced into microscale flow by scale effect and interface effect, which are influenced by multiple parameters including the channel geometry and flow condition. In order to understand the complex flow phenomena, physical mechanisms should be studied from the fundamental perspective of hydrodynamics. Related work of our group on behaviors of droplets and particles over recent years is summarized. By analyzing the variation of characteristic parameters of droplet or particle, distinct flow regimes and corresponding critical conditions can be specified. Key control parameters dominating the flow can be confirmed and theoretical models can be constructed to pursue the manipulation methods of different behaviors. This study can provide references for the improvement of the theoretical system of complex flow at microscale and the related engineering applications. |
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