Numerical Simulation of Self-propelled Droplet over a Surface with Surface Tension Gradient

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Zolfi, Hamid Reza | 2020

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 53023 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Javadi, Khodayar
Abstract:
Ice accretion may cause malfunction or serious performance degradation in outdoor facilities and structures, such as aircraft, ship, locks and dams, offshore platforms, solar panels, wind turbines, power transmission towers and lines, and sports facilities, leading to huge economic loss or even loss of human lives. Icephobic materials, typically applied in the form of coatings, have received growing attention in the last decade. This work focuses on surfaces with a surface tension gradient which has icephobic properties. various surface tension gradients such as linear, exponential, cycloid and parabola have been imposed on a surface in order to achieve the shortest time for a droplet to reach the end of the domain. A two-phase Navier-stokes model was implemented along with Level set method to simulate droplet moving due to various surface tension gradients. Parabola gradient found to be the optimum gradient for a droplet in order to reach the end of the surface in the shortest time possible. a three-dimensional simulation was done and the droplet displacements were compared with two-dimensional simulation result
Keywords:
Superhydrophobic Surfaces ; Marangoni Effect ; Surface Tension ; Self-Propelled Particles ; Icephobicity ; Self-Propelled Droplet ; Superhydrophilic Surface