CIESC Journal

• 化工过程与装备 • 上一篇    下一篇

T形微通道内气泡(液滴)生成机理的研究进展

付涛涛,马友光,朱春英   

  1. 天津大学化工学院化学工程联合国家重点实验室,天津 300072
  • 出版日期:2011-11-05 发布日期:2011-11-21

Progress in bubble (droplet) formation mechanism in T-shaped microchannels

FU Taotao,MA Youguang,ZHU Chunying   

  1. State Key Laboratory of Chemical Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China
  • Online:2011-11-05 Published:2011-11-21

摘要:

综述了T形微通道内气泡(液滴)的生成机理。讨论了挤压机制、剪切机制以及挤压-剪切共同作用机制下气泡(液滴)生成控制因素,表明挤压机制发生于受限气泡(液滴)的生成,其生成尺寸主要由气液流量控制;剪切机制发生于未受限气泡(液滴)生成,主要由毛细数控制;挤压和剪切共同作用机制发生于挤压-滴状转变区内气泡(液滴)的生成,并由毛细数和流量比共同控制。同时介绍了3种不同机制的物理模型以及黏度比对气泡(液滴)生成的影响。

Abstract:

The mechanisms for bubble and droplet formation in T-shaped microchannels were reviewed. Control parameters for bubble and droplet formation under three various mechanismsi.e. squeezing mechanismshearing rupture mechanism and squeezing-shearing rupture mechanismwere discussed. The results showed that the formation of confined bubbledropletis attributed to the squeezing mechanism and the bubbledropletsize is controlled by gas/liquid flow rate ratio. The production of unconfined bubbledropletis attributed to the shearing rupture mechanism and is controlled by capillary number. The generation of bubbledropletin squeezing-dripping transition regime is attributed to the squeezing-shearing rupture mechanism and is controlled by both capillary number and gas/liquid flow rate ratio. The physical models for three different mechanismsas well as the influence of viscosity ratio on bubble and droplet formation were introduced.