Gas Transport Into Vortex Cavities

Doctoral thesis (2023)

Authors

S. Nanda Ship Hydromechanics and Structures - Mechanical, Maritime and Materials Engineering
Research Group
Ship Hydromechanics and Structures (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2023 S. Nanda
DOI: https://doi.org/10.4233/uuid:aec085db-c92e-4842-9ea3-96a7dce93fd7
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Published Date

2023

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Marine and Transport Technology

Research Group

Ship Hydromechanics and Structures

Abstract

The research presented in this thesis aims at understanding how gases influence the cavitating vortex generated by a wing tip in a stationary flow. Gases in the flow occur as non-condensible microbubbles as well as gases dissolved in the liquid. They are typically abundant in surface flows. For studying how dissolved gases influence a cavitating vortex, a set of diffusion models are developed that predict how gases dissolved in water are transported into a vortex cavity. The predictions of the growth rate of a cavitating vortex using these models is then compared with the growth and development of a cavitating wingtip vortex generated by a NACA 662 −(415) foil. The cavitating vortex is measured using single-view shadowgraph imaging in a cavitation tunnel. Some experimental practices on how the flow conditions are prepared prior to a measurement are also investigated, which is instructive in guiding experimental practices that promote repeatability of the results. A good agreement is achieved between the measured growth rate of the cavity, and that predicted by the diffusion models. The results also explain previously observed behavior of the development of a cavitating vortex from literature.