Role of step-shape structures and critical failure bubble volume in micro bubble constraint  

作　　者：ZHU XiaoGu HUANG WeiFeng LI Yong 

机构地区：[1]State Key Laboratory of Tribology,Department of Precision Instruments and Mechanology,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Science Bulletin》2012年第22期2941-2946,共6页

基　　金：supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China(20110002110077)

摘　　要：Micro fluid devices using micro bubbles have attracted much attention for their special advantages.In many cases,the bubbles must be constrained to a certain position so as to grow or shrink under control.In this paper,we discuss the effect of step-shape structures in constraining bubbles against the surface force,which plays a dominant role on the micro scale.We fabricate specimens with a step and electrodes and carry out electrolysis experiments in water to observe bubble growth.We observe the constraining effect of steps as well as failure phenomena.Based on numerical simulations and theoretical analysis,we introduce the critical failure bubble volume and present the analytic solution in a 2-D model.Using step-shape structures is an easy method of constraining bubbles within the critical failure volume.Micro fluid devices using micro bubbles have attracted much attention for their special advantages. In many cases, the bubbles must be constrained to a certain position so as to grow or shrink under control. In this paper, we discuss the effect of step-shape structures in constraining bubbles against the surface force, which plays a dominant role on the micro scale. We fabricate specimens with a step and electrodes and carry out electrolysis experiments in water to observe bubble growth. We observe the constraining effect of steps as well as failure phenomena. Based on numerical simulations and theoretical analysis, we introduce the critical failure bubble volume and present the analytic solution in a 2-D model. Using step-shape structures is an easy method of constraining bubbles within the critical failure volume..

关 键 词：形状结构 气泡体积 微气泡 失效 水面舰艇部队 故障现象 微流体装置 电解水实验 

分 类 号：TP211.4[自动化与计算机技术—检测技术与自动化装置]