On the assessment of a VOF based compressive interface capturing scheme for the analysis of bubble impact on and bounce from a flat horizontal surface
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2014Access:
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Albadawi, A., Donoghue, D.B., Robinson, A.J., Murray, D.B., Delauré, Y.M.C., On the assessment of a VOF based compressive interface capturing scheme for the analysis of bubble impact on and bounce from a flat horizontal surface, International Journal of Multiphase Flow, 65, 2014, 82-97Download Item:
Abstract:
The process of free rise, collision on and bounce from a solid horizontal
surface for a single isolated bubble is investigated by numerical simulations
based on the Volume of Fluid method (VOF). The volume fraction advection
equation is solved algebraically using the compressive scheme implemented in
the CFD open source library (OpenFOAMR
) using both axi-symmetrical and
three dimensional domains. The solution sensitivity to the mesh refinement
towards the solid boundary and the contact angle formulation (static and
dynamic) are assessed with two different fluid mixtures for a range of Bond
numbers [0.298 − 1.48] and two different surface hydrophilicities. Numerical
results are assessed against published as well as new experiments to include
both axi-symmetrical and three dimensional rise trajectories. The investigation
addresses the liquid microfilm formation and drainage considering both
flow and pressure fields and bubble dynamic characteristics over successive
rebounds. Results highlight the importance of resolving the liquid micro
layer at the interface between the gas and solid surface in particular in the
case of superhydrophobic surfaces. A coarse mesh is shown to precipitate the
liquid film drainage. This results in early formation of a triple phase contact
line (TPCL) which can occur as soon as the first rebound whereas physical
observations indicate that this typically happens much later at a stage whena significant part of the bubble kinetic energy has been dissipated following
several rebounds. As a result numerical predictions are shown to be much
more sensitive to the contact angle formulation than when a refined mesh allows
a more accurate representation of the film drainage. In this case, static
and dynamic contact angle models give broadly similar rebound characteristics.
Following validation, the numerical simulations are used to provide
some useful insight in the mechanisms driving the film drainage and the gas
liquid interface as it interacts with the solid surface
Sponsor
Grant Number
Science Foundation Ireland (SFI)
09/ RFP/ ENM2151
Author's Homepage:
http://people.tcd.ie/dmurrayhttp://people.tcd.ie/arobins
http://people.tcd.ie/albadaa
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International Journal of Multiphase Flow65
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http://dx.doi.org/10.1016/j.ijmultiphaseflow.2014.05.017Metadata
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