Micro-droplet formation with non-Newtonian solutions in microfluidic T-junctions with different inlet angles

2012 7th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) Pub Date : 2012-03-05 DOI:10.1109/NEMS.2012.6196809

Z. Gu, J. Liow

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引用次数: 6

Abstract

T-junctions with various inlet angles (θ=30°, 60°, 90°, 120° and 150°) were employed to produce microdroplets. Experimental results showed that the inlet angles play an important role in controlling the droplet size and the T-junction with an inlet angle of 90° always generating the largest droplets for a given continuous phase flow rate. The results for the droplet diameters were separated into two groups, based on the range of the inlet angles (acute angles of 30°, 60° and 90°, and obtuse angles of 90°, 120° and 150°). For the acute inlet angles, the droplet size was larger for an inlet angle of θ=30° than for an inlet angle of θ=60°. For the obtuse inlet angles, the diameter of droplets produced by T-junctions with inlet angles of 120° and 150° were similar in size but smaller than that for 90°. The effect of flow rates of both phases on the droplet formation mechanism was discussed. Water and non-Newtonian xanthan gum and PEO (Polyethylene oxide) solutions were used as the dispersed phase and the differences in droplet sizes were studied.

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不同进口角微流体t型结中非牛顿溶液的微液滴形成

采用不同进口角(θ=30°、60°、90°、120°和150°)的t型结制备微滴。实验结果表明，进口角对液滴大小有重要的控制作用，在一定连续相流速率下，进口角为90°的t型结总是产生最大的液滴。液滴直径的计算结果根据进口角(锐角为30°、60°和90°，钝角为90°、120°和150°)的范围分为两组。当进口角为θ=30°时，液滴尺寸比进口角为θ=60°时大。当进口角为钝角时，进口角为120°和150°的t结所产生的液滴直径大小相近，但小于进口角为90°时的液滴直径。讨论了两相流速对液滴形成机理的影响。以水、非牛顿黄原胶和PEO(聚乙烯氧化物)溶液为分散相，研究了液滴大小的差异。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2012 7th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)

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