Portland State University. Department of Mechanical and Materials Engineering
Date of Publication
Master of Science (M.S.) in Mechanical Engineering
Fluid dynamics, Reduced gravity environments
1 online resource (xii, 35 pages)
We experimentally investigate the phenomena of large jet rebound, a mode of fluid transfer following oblique jet impacts on hydrophobic substrates. We initially seek to describe the jet rebound regimes in tests conducted in the weightless environment of a drop tower. A parametric study reveals the dependence of the flow structure on the relevant dimensionless groups such as Reynolds number and Weber number defined on the velocity component perpendicular to the substrate. We show that significantly larger diameter jets behave similarly as much smaller jets demonstrated during previous terrestrial investigations is some parameter ranges while the flow is fundamentally different in others. Level-set numerical predictions are provided for comparisons where practicable. Simple models are developed predicting landing geometry and the onset of instability that are found to yield good agreement with experiments and simulations. Improving our understanding of such jet rebound opens avenues for unique transport capabilities.
Cardin, Karl Jeffrey Theodore, "Jet Rebound from Hydrophobic Substrates in Microgravity" (2019). Dissertations and Theses. Paper 4830.