The primary objective of the NWO-sponsored AQUA program is to gain a better understanding of the effect of water quality on multiphase flow dynamics, in particular on cavitation and air lubrication for drag reduction. The participating universities and research institutes include Delft University of Technology, University of Twente (Physics of Fluids group), and Royal Netherlands Institute for Sea Research. At Delft University, we currently have 1 open PhD position related to cavitation research.
Background
Bubbly flows attenuate underwater sound and can reduce the friction drag of a ship, as a result of which less fuel is needed. Although the behavior of air bubbles in freshwater is known reasonably well, bubbles in saline seawater behave very differently. In this program, the researchers will compare the dynamics of bubbly flows in different types of water, varying from freshwater to natural seawater, to gain a better understanding of how bubbles can be used to manage friction, sound propagation and cavitation. The ultimate aim is to be able to predict how the water quality (gas and chemical content) influences drag reduction and cavitation hindrance.
Project description
The advertised position concerns an experimental research project on water quality effects on developed sheet cavitation dynamics and radiated noise. Sheet cavitation is a dominant type of cavitation on hydrofoils and marine propellers. The study will be conducted in the new and unique Delft Multiphase Flow lab which is operational since early 2021. The required infrastructure (high-speed imaging, tomographic particle image velocimetry) is available. Close collaboration with other projects in the AQUA research program is encouraged, as well as with other research groups working in the same discipline.
The total duration of this PhD project is 4 years, with a starting date no later than Dec. 31, 2022.
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