带亲水盖板的毛细被动阀的仿真和实验研究

具有亲水盖板的毛细被动阀在聚合物微流体芯片的设计中有着重要意义。本文使用Surface Evolver软件,实现了被动阀临界压力的计算。指出由于盖板具有很好的亲水性,要实现仿真收敛,对侧壁的接触线要设置为允许有部分接触线流过扩张段入口。使用PDMS微通道和玻璃平板制作了微流体芯片,观察到了接触线流到扩展段侧壁的现象。进行了转台实验,实验和仿真结果相符。讨论了扩张段个数和侧壁扩张角对临界压力的影响。

Simulation and Experiment of Capillary Burst Valve with Hydrophilic Flat Cover

It is important to study the capillary burst valve with a hydrophilic flat cover used in a microfluidc system.The burst pressure of capillary burst valve is obtained by the simulation using the surface evolver algorithm.When the passive valve is limited by a flat cover with good hydrophilicity,it is necessary to set some liquid contact line to pass through the entrance of expansion section for the simulation.The microvalves composed of PDMS microchannels and a glass cover were made and tested.And the phenomenon that the contact line flow through the expansion was observed successfully.The obtained simulate data has agreement with experiment data based on a rotating platform.The effect of different expansion sections and the expansion angle were discussed.