Moving wall driven two-phase (water and air), turbulent flow inside a rectangular enclosure is modeled and solved computationally. Reynolds number is Re = 578,302 for water and Re = 31,746 for air based on the kinematic viscosities of the fluids, wall velocity, and the length of the moving wall. Two enclosures are considered, namely, a cube and an infinitely long rectangular parallelepiped. For the cube, two different angular orientations from the horizontal axis are used, namely, 0° and 45°. Flow is unsteady, and sometimes unstable and chaotic. The larger scales of the flow are resolved using Large Eddy Simulation (LES), while the sub-grid scales are captured by the dynamic k-equation eddy-viscosity model. The flow special features include the presence of a smooth water layer along the moving wall, an unstable and chaotic flow along the stationary walls, impingement upon water-air interface, and entrainment of air into the pool of water and bubble formation. The liquid ejection generates waves that travel away from the walls towards the center of the enclosure. The air entrainment and bubble formation create a chaotic flow that causes the transient driving force of the moving wall to fluctuate. This thesis presents the time history of the power needed to drive the moving wall, a model for droplet formation, theoretical calculation of the driving power, contours of liquid volume fraction, and the fluid vorticity.
|Commitee:||Darabi, Jeff, Yan, Terry|
|School:||Southern Illinois University at Edwardsville|
|Department:||Mechanical and Industrial Engineering|
|School Location:||United States -- Illinois|
|Source:||MAI 54/05M(E), Masters Abstracts International|
|Keywords:||Air-water flows, Large eddy simulation, Lid-driven cavity, Moving walls, Recirculation and entrainment, Turbulent, Two phase flows|
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