Presentation Title

Computer Simulations of Two-Dimensional Bubble Rafts

Start Date

November 2016

End Date

November 2016

Location

HUB 302-129

Type of Presentation

Poster

Abstract

The behavior of two dimensional bubble rafts can yield insights into the rheological properties of foams i.e. how they flow and deform under applied forces. Bulk properties of the foam can be related to the interactions between individual bubbles. We modeled the movement of bubbles in such a two-dimensional raft using computer code written in IDL (Interactive Data Language), compared our results to published data, and then extended the modeling to determine the effect of changing the polydispersity i.e. the distribution of bubble sizes in the raft. First, code was written to simulate the interactions of bubbles with each other under various shear strain conditions. The bubbles were initialized in a square array and then equilibrated under zero strain until all bubbles were stationary. Virtual experiments, in which a constant rate of strain was applied, were subsequently performed on these equilibrated bubble rafts to determine the effects of different polydispersities, volume fractions, and strain rates on bubble movement. The code used the simple Euler method, a computational procedure for solving differential equations with given initial conditions, rather than the Verlet algorithm used in previous studies. In a direct comparison between the graphs in the literature and the graphs produced using the simple Euler method, the graphs were found to be almost identical. With this verification of code viability, further experiments are being performed to study the effect of polydispersity on the behavior of the bubble raft at various strain rates.

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Nov 12th, 1:00 PM Nov 12th, 2:00 PM

Computer Simulations of Two-Dimensional Bubble Rafts

HUB 302-129

The behavior of two dimensional bubble rafts can yield insights into the rheological properties of foams i.e. how they flow and deform under applied forces. Bulk properties of the foam can be related to the interactions between individual bubbles. We modeled the movement of bubbles in such a two-dimensional raft using computer code written in IDL (Interactive Data Language), compared our results to published data, and then extended the modeling to determine the effect of changing the polydispersity i.e. the distribution of bubble sizes in the raft. First, code was written to simulate the interactions of bubbles with each other under various shear strain conditions. The bubbles were initialized in a square array and then equilibrated under zero strain until all bubbles were stationary. Virtual experiments, in which a constant rate of strain was applied, were subsequently performed on these equilibrated bubble rafts to determine the effects of different polydispersities, volume fractions, and strain rates on bubble movement. The code used the simple Euler method, a computational procedure for solving differential equations with given initial conditions, rather than the Verlet algorithm used in previous studies. In a direct comparison between the graphs in the literature and the graphs produced using the simple Euler method, the graphs were found to be almost identical. With this verification of code viability, further experiments are being performed to study the effect of polydispersity on the behavior of the bubble raft at various strain rates.