液滴自发运动的微粗糙结构梯度表面参数研究  

Parametric Study of Droplet Spontaneous Motion on Microstructured Gradient Surface

作　　者：余颖 陈硕[1] 

机构地区：[1]同济大学航空航天与力学学院,上海200092

出　　处：《力学季刊》2017年第3期408-419,共12页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(51276130)

摘　　要：采用多体耗散粒子动力学(MDPD)方法,研究液滴在微结构粗糙梯度表面上的自发运动现象.表面微结构的构成影响液滴自发运动速度和距离.对相关的具体参数如构成微结构表面立柱的截面形状、排布、边长、面积等参数进行系统研究.研究表明,微结构表面的排布影响液固接触区域的边缘大小和形状,进而影响液滴自发运动输送效果;不对称结构立柱朝向对液滴运动也有影响,其中先宽后窄截面形状的立柱上液滴运动速度较快;对于对称的立柱组成的梯度表面,定义周长和面积的比值为长积比,该参数越大,液滴自发运动速度越快.本文可为微流控表面设计提供一定的数值模拟依据.The spontaneous motion of droplets on micro-column arrayed gradient surface was investigated by many-body dissipative particle dynamics. Droplet velocity and moving distance are influenced by the cross-section shape, arrangement, size and area of the micro-columns. These parameters were discussed in details. The simulated results show that the footprint of the liquid-solid contact area depends on the arrangement of the microstructured surface, which also affects the droplet velocity and moving distance. The movement of droplet is also influenced by the orientation of the asymmetric micro-column structures. The droplet will move faster on the columns with a section shape of wider front and narrow tail. For symmetric micro-column structures, droplet can achieve higher velocity on micro-columns with larger ratio of perimeter to area in column cross-section. The present study is helpful for the design of micro-fluidic structures such as micro-fluidic chip.

关 键 词：微结构梯度 立柱截面参数 液滴自发运动 多体耗散粒子动力学 

分 类 号：O359.1[理学—流体力学] O368[理学—力学]