Aerospace and Mechanical Engineering
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Drop Motion Through an Orifice in a Liquid/Liquid System


Principal investigator:

Ellen Longmire

Research Assistant:

Ankur Bordoloi


Sponsor:

Department of Energy


Overview


In this study, drops of water/glycerin solution with diameter, D, are released in ambient silicone oil and allowed to fall downward by gravity. After reaching terminal speed, the drops encounter a thin plate with orifice diameter, d, placed horizontally within the surrounding tank. One objective of this project is to provide test data to validate a two-color BGK lattice-Boltzmann solver for multifluid flow with moving contact lines. A second objective is to obtain physical insight into the effects of both deformation and surface contact on the drop behavior as it moves through the orifice. We use high-speed imaging and particle image velocimetry (PIV) to perform a parametric examination of diameter ratio d/D, drop Bond number, viscosity ratio (λ), and contact angle on the drop behavior. In PIV studies, the refractive indices of both liquids are matched so that motion in the drop interior can be quantified. The drop fluid and interfaces are visualized by laser-induced fluorescence (LIF).

 

Hydrophobic plate

Movie 1: Axisymmetric drop motion through a hydrophobic orifice plate. The white box shows the approximate location of the orifice. Test parameters: ReD = 17.8, d/D = 0.6

 

Hydrophilic plate

Movie 2: Axisymmetric drop motion through a hydrophilic orifice plate. The white box shows the approximate location of the orifice. Test parameters: ReD = 17.8, d/D = 0.6

 

Figure 1

Figure 1: Velocity fields superposed with vorticity contours as drop approaches and penetrates the orifice. Upper right plot shows drop centroid velocity corresponding with each time frame. Viscosity ratio (λ) = 0.15.

Publications

Bordoloi, A.D. and Longmire, E.K., Drop motion through a confining orifice, J. Fluid Mech., 759, 520-545, 2014

Bordoloi, A.D. and Longmire, E.K., Simultaneous PIV and interface tracking applied to drops moving through a confining orifice, 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, 2014
Bordoloi, A.D. and Longmire, E.K. “Effect of neighboring perturbations on drop coalescence at an interface,” Phys. Fluids, 24, 062106, 2012

Last Modified: 2015-04-30 at 19:41:28 -- this is in International Standard Date and Time Notation