Impact phenomena in multiphase flows

Research output: ThesisPhD Thesis - Research UT, graduation UT

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Abstract

We want to be able to simulate and predict the loads generated during liquid-solid collisions, including the case when the liquid phase contains bubbles. Additionally, we simulate the passage of microparticles in a microchannel and study the way the particles clog either permanently or intermittently.

In Chapter 1, we study how pressure waves are transmitted through a liquid containing bubbles. Inside the liquid, we stack initially spherical bubbles and excite them with a piston. We then compute the eigenfrequencies of the bubbles.

In Chapter 2, we study the short-time force response of the impact of a droplet onto a solid substrate, i.e., the response that the solid experiences through the gas layer beneath the droplet just before contact. We simulate the case when the droplet is purely liquid as well as when bubbles are present inside the droplet.

In Chapter 3 we study the long-time force response of the impact of a droplet onto a solid substrate. We simulate the impact up until the moment of maximum droplet spreading. We compute the load that the droplet exerts onto the solid for purely liquid droplets, as well as for droplets containing bubbles of different sizes and placed at different locations.

In Chapter 4 we study the impact of a disc onto a quiescent liquid pool. We compute the force for the case when there are no bubbles in the bath and compare it with the cases when we place one or several bubbles.

In Chapter 5, we simulate microparticles in microchannels. We simulate the situation when a constriction is present inside the channel. If the particles are comparable in size with the constriction, there is a non-zero probability that they clog the channel. We study a variety of particle sizes and explore different flowing regimes.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • van der Meer, Devaraj, Supervisor
  • Marin, Alvaro, Co-Supervisor
Award date26 Oct 2023
Place of PublicationEnschede
Publisher
Print ISBNs978-90-365-5857-0
Electronic ISBNs978-90-365-5858-7
DOIs
Publication statusPublished - 26 Oct 2023

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