崔艺文,吴杰,严启凡,宣守虎,龚兴龙*.流动聚焦装置中液滴的形成:喉部尺寸的影响[J].实验力学,2017,32(5):677~686 |
流动聚焦装置中液滴的形成:喉部尺寸的影响 |
Droplet Formation in Flow Focusing Device: Effect of Orifice Sizes |
投稿时间:2017-07-18 修订日期:2017-08-09 |
DOI:10.7520/1001-4888-17-306 |
中文关键词: 流动聚焦 液滴 喉部长度 喉部宽度 粘度 |
英文关键词:flow focusing droplet orifice length orifice width viscosity |
基金项目:国家自然科学基金(11572309)资助 |
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中文摘要: |
在本文中,研究了液滴在一个流动聚焦微流体设备中的形成过程,分析了喉部长度和宽度以及连续相的流速和分散相的粘度对液滴尺寸的影响。在固定的分散相流速(Qd)下,连续相流速(Qc)对于液滴尺寸有重要的影响。当Qc<0.7mL/h,液滴尺寸在喉部长度到达一个临界值之前先趋于增加,之后随着喉部尺寸的继续增加逐渐下降;当Qc>0.7mL/h,液滴尺寸随着喉部长度的增加而降低。而越大的喉部宽度会产生越大尺寸的液滴。在Qc继续增长的过程中通常会出现从挤压模式到滴模式的转变,最终液滴尺寸呈现出随着Qc的增加指数降低的特征。归因于流速控制破碎机制,低粘度分散相下,液滴尺寸随粘度的增加而增加。 |
英文摘要: |
In this work, droplet formation in a microfluidic flow-focusing device was studied. The influence of orifice length and width on droplet size was analyzed. At a fixed flow rate (Qd) of dispersed phase, the flow rate (Qc) of continuous phase has critical influence on droplet size. When Qc<0.7mL/h, before orifice length increases to a critical value, the droplet size increases first, then gradually decreases along with the further increase of orifice length. When Qc>0.7mL/h, the droplet size decreases with the increase of orifice length. However, the larger the orifice width is, the bigger the droplet size. The influence of flow rate of continuous phase and viscosity of dispersed phase was also investigated. The transition from squeeze regime to dripping regime usually exists in a growing process of Qc, and the droplet size presented an exponential reducing behavior with Qc. For low viscosity dispersed phase, the droplet size increases with the increase of viscosity, which is controlled by mechanism of flow rate control breakup. |
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