Wetting In Pressure Driven Slot Flow
Author(s)
A. Sun, T. Baer, S. Reddy, L. Mondy, R. Schunk,
P. Sackinger, R. Rao, D. Noble, J. Bielenberg & A. Graham
Abstract
To test wetting models for predicting a range of wetting behaviours in slot flow,
we utilize two finite-element techniques to model a fluid displacing air as it
flows between parallel plates where the upper plate has a notch perpendicular to
the flow direction. The notched portion of the upper plate is representative of a
mold joint, a feature in the part to be potted, or even a long scratch in the plate
surface. The goal is to study the wetting conditions that can minimize air
entrapment in the notch. The numerical tool, developed at Sandia National
Laboratories, is used to predict the front movement through the slot. Both a
level-set formulation and an ALE formulation are used to track the front with
two types of wetting models. A linear relationship between the wetting line
velocity and the deviation between the dynamic and static contact angles is used
when using the level-set algorithm, while a nonlinear wetting model originated
by Blake is used for the ALE calculations. Preliminary results show that the
capillary number, or the ratio of viscous forces to surface tension forces, is the
dominant parameter. Nevertheless, whether or not the notch fills with liquid is
also dependent on the velocity conditions imposed at the triple point.
Keywords: wetting, interface tracking.
1 Introduction
In many of manufacturing processes where control of liquid flow in a complex
geometry is required to ensure a consistent outcome, the degree of wetting is
Keywords
wetting, interface tracking.
Related Book
Other papers in this volume
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