Simulation of bubble dynamics in a microchannel with sudden contraction using a front-tracking method
Date Issued
2011
Date
2011
Author(s)
Chen, Zhi-Jen
Abstract
This research shows the simulation results of bubble dynamic using a front-tracking method. The applied code was modified from 2D axisymmetric version to 2D version. Compared with the original version, this version can set many bubbles or droplets in the domain, and we can present the phenomenon which was non-axisymmetric.
This paper consists of two parts. The first part discusses bubble dynamics in a microchannel with sudden contraction. A Bubble slug was placed in a microchannel with sudden contraction which has a fixed pore size. In a pressure driven flow, this bubble slug will pass through or be held back by a bilateral block due to varied dimensionless parameters, Reynolds number and Weber number. Also, with the different parameters, bubble slug will deform in distinct way. In the other part, we want to present the interactions of multi-bubble dynamics. Thanks to the bubble behavior was confined by the pressure driven flow, the interaction of bubbles was not sufficiently obvious. We differ our focus to a pair of rising bubble which was lined in a row, then, we can observe the interaction of bubbles clearly. Likely, By differing the dimensionless parameters of rising bubble, there were some interesting phenomenon on bubble shape, rising trajectory and the wake behind bubbles. We also discussed the wall effect by putting the bubbles in a narrow or broad domain.
Subjects
multi-phase flow
numerical simulation
rising bubble
bubble slug
front-tracking method
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