Flow of Quasi-2D Emulsion Droplets Through Small Openings Público
Hofert, Anisa (Spring 2020)
Published
Abstract
We examine how various parameters affect the flow rate of quasi-2D soft particles moving through tight openings. To observe this, we create thin hopper-shaped chambers which have a small exit for the particles to flow through. We fill the chambers with monodisperse oil-in-water emulsions with a soap surfactant. We use microscopy to observe the oil droplets moving through the chamber, looking at deformation, particle flow, and outflow rate. We find that the exit size of the chamber is more important in determining the flow rate of the droplets than the number of droplets in the chamber. This means that the exit flux of the droplets is constant. There is a linear relationship between exit flux of the droplets and opening size. The flux goes to 0 when the ratio of the width of the opening and the diameter of the droplets (w/d) is less than 0.49 when extrapolated. The position of maximum deformation is also dependent on the w/d, with larger w/d having more deformation before the opening than at the opening.
Table of Contents
1 Background pg. 1
1.1 Motivation pg. 1
1.2 Particle Flow pg. 1
1.3 Beverloo Laws pg. 2
1.4 Soft Particle Flow pg. 3
1.5 Emulsions pg. 4
1.6 The Experiment pg. 5
2 Methods pg. 6
2.1 Microfluidic Device and Creating Emulsions pg. 6
2.1.1 Creating Emulsions pg. 6
2.1.2 Emulsion Coalescence and Size pg. 8
2.2 Chamber Development pg. 8
2.2.1 Creating Chambers pg. 8
2.2.2 Chamber considerations and testing pg. 9
2.2.2.1 Material Development pg. 9
2.2.2.2 Shape Development pg. 10
2.3 Loading Chambers pg. 11
2.4 Microscopy pg. 13
2.5 Particle Tracking pg. 13
3 Results and Analysis pg. 14
3.1 Video Observations and Clogging pg. 14
3.2 Deformation pg. 16
3.3 Individual Droplet Motion pg. 19
3.4 Droplet Flux pg. 21
4 Conclusion pg. 23
5. Future Work pg. 24
5.1 Changing Surface Tension/ Energy pg. 24
5.2 Changing Upward Force pg. 25
5.3 Conclusion pg. 26
6 References pg. 27
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