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Table of contents
Chapter 1 Literature review
1.1 Multiphase flows at the microscale
1.1.1 Droplet (bubble) formation at the microscale
1.1.2 Droplet (bubble) breakup at the microscale
1.2 Drop coalescence and spreading
1.2.1 Drop impact and coalescence on a liquid surface
1.2.2 Drop impact and spreading on a solid surface
1.3 Passive and active manipulation on multiphase flows
1.3.1 Passive methods
1.3.2 Active methods
1.4 Outline
Chapter 2 Experimental section
2.1 Experimental devices
2.1.1 High-speed camera
2.1.2 Ultra-high-speed DC electrical device
2.1.3 High-speed micro-PIV
2.1.4 Syringe pump
2.1.5 Microfluidic devices
2.2 Experimental liquids
2.3 Analytical methods
2.3.1 High-speed images
2.3.2 Electrical signals
2.3.3 Velocity fields
2.3.4 Liquid properties
Chapter 3 Droplet formation in T-junction and flow-focusing devices
3.1 Introduction
3.2 Experimental section
3.2.1 Liquid properties for the droplet formation in the T-junction device
3.2.2 Liquid properties for the droplet formation in the flow-focusing device
3.3 Results and discussion
3.3.1 Formation of elastic droplets in a microfluidic T-junction
3.3.2 Droplet formation in elastic fluid at a flow-focusing microchannel
3.4 Summary
Chapter 4 Stretching and breakup of elastic droplets in consecutive flow-focusing device
4.1 Introduction
4.2 Experimental section
4.3 Results and discussion
4.3.1 Breakup regimes of the droplets in the flow-focusing junction
4.3.2 Dynamics of the droplet stretch-rebound
4.3.3 Dynamics of the droplet stretch-breakup
4.4 Summary
Chapter 5 Initial coalescence of an aqueous drop at a planar liquid surface
5.1 Introduction
5.2 Experimental section
5.3 Results and discussion
5.4 Summary
Chapter 6 Drop impact, spreading and breakup on a solid surface
6.1 Introduction
6.2 Experimental section
6.3 Results and discussion
6.3.1 Initial contact and spreading of a pendant drop at solid surface
6.3.2 Filament thinning of the liquid neck
6.4 Summary
Chapter 7 Magnetic manipulation on the coalescence of a ferrofluid drop at its bulk surface
7.1 Introduction
7.2 Experimental section
7.3 Results and discussion
7.3.1 Initial coalescence of a ferrofluid drop without a magnetic field
7.3.2 Initial coalescence of a ferrofluid drop under a magnetic field
7.4 Summary
Chapter 8 Conclusions, innovations and perspectives
8.1 General conclusions
8.2 Innovations
8.3 Perspectives
