Dynamics of viscous liquid bridges inside microchannels subject to external oscillatory flow

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Majid AhmadlouydarabZhangxin Chen

Abstract

We report on two-dimensional simulations of liquid bridges' dynamics inside microchannels of uniform wettability and subject to an external oscillatory flow rate. The oscillatory flow results in a zero net flow rate and its effects are compared to those of a stationary system. To handle the three phase contact lines motion, Cahn-Hilliard diffuse-interface formulation was used and the flow equations were solved using the finite element method with adaptively refined unstructured grids. The results indicate that the liquid bridge responds in three different ways depending on the substrate wettability properties and the frequency of the oscillatory flow. In particular below a critical frequency, the liquid bridge will rupture when the channel walls are philic or detach from the surface when they are phobic. However, at high frequencies, the liquid bridge shows a perpetual periodic oscillatory motion for both philic and phobic surfaces. Furthermore, an increase in the frequency of the flow velocity results in stabilization effects and a behavior approaching that of the stationary system where no rupture or detachment can be observed. This stable behavior is the direct result of less deformation of the liquid bridge due to the fast ...Continue Reading

References

Nov 18, 2000·Journal of Colloid and Interface Science·O PitoisX Chateau
Jan 27, 2005·Chemical Reviews·Chao-Yang Wang
Oct 4, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Huina LiCass T Miller

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Citations

Mar 18, 2016·Physical Review. E·Kaustav ChaudhurySuman Chakraborty

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