摘要
针对液体在微通道内的自输运特性,采用数值仿真与能量解析相结合的方法研究了液滴在锥形微通道内的自输运特性及力学驱动机制,得到微通道的锥形角、液滴与微通道内壁的接触角及微通道的润湿性对液滴自输运特性的影响关系.分析表明,微通道的锥形角、液滴与微通道内壁的接触角均能影响液滴的自输运方向及驱动力大小.对于亲水性微通道,微通道的锥形角、液滴与微通道内壁的接触角其作用效果呈现整体形态;对于疏水性微通道,微通道的锥形角、液滴与微通道内壁的接触角其作用效果呈现局域形态.这可为研究液体在微通道内的自输运机理及界面内液体细观流动机制奠定理论基础.
The droplets directional motion characteristics in conical microchannels with different wetting properties and driving mechanisms were studied with the numerical simulation method and the energy-based analytical method to clarify the mechanisms for directional motions of liquid in nature.The effects of the conical angle,the contact angle between the droplet and the microchannel wall as well as the microchannel wetting property on the directional motion characteristics of the droplet in the conical microchannel,were obtained.The energy-based theoretical analysis and the numerical simulation both indicate that,the conical angle and the contact angle substantially influence the motion direction and the driving force of the droplet,but with different effectivenesses.The effectiveness is in holistic consistency in the hydrophilic conical microchannel,but local features emerge in the hydrophobic conical microchannel.The study provides a theoretic base for the research of directional motion mechanisms and microfluidic flow mechanisms in the solid interface.
出处
《应用数学和力学》
CSCD
北大核心
2017年第3期284-294,共11页
Applied Mathematics and Mechanics
基金
国家自然科学基金(51375132)~~
关键词
锥形微通道
自输运特性
接触角
润湿性
conical microchannel
directional motion
contact angle
wetting property
