The influence of contact line dynamics on drop deposition, repellency, and condensation.

For many years, solid-liquid and liquid-liquid interfacial dynamics have attracted attention in a variety of natural and industrial applications, including inkjet printing, water harvesting, and spray coating technologies. In a solid-liquid interface, when a droplet is placed on a solid substrate, the boundary between the solid, the liquid, and the corresponding equilibrium vapor is referred to as the "contact line," which play a crucial role in droplet's mobility on the surface. Various studies investigated the "contact line" problem and un- covered many unique physics that showed the relationship of wettability of the surface and liquid movement after impacting. However, the "contact line" dynamics on the droplet con- densation and stress at contact point remain unclear until this day. This work explores the complex dynamics of droplet behavior on surfaces with varying wettabilities and viscosities, focusing on contact line phenomena, droplet oscillation, and condensation mechanisms. It examines how external forces, such as drop oscillation, influence the movement of the contact line, revealing that increased viscosity can restrain contact line mobility, thereby extending oscillation duration and altering the droplet's natural frequency. The study also investigates how surface wettability and patterning affect dropwise condensation (DWC), demonstrating that strategic wettability contrasts and surface patterns can optimize droplet shedding mechanisms and improve water collection efficiency. Additionally, the research explores the formation of large-area microbubbles (LAMs) due to air entrainment during droplet impacts on liquid films. Using high-speed imaging, we investigate the conditions and instabilities responsible for the formation of LAMs, focusing on intermolecular instability, contact line instability, and Rayleigh instability, and their dependence on drop inertia and fluid dynamics. The findings provide valuable insights into optimizing surface properties for enhanced condensation and water collection and contribute to the understanding of microbubble generation in dynamic fluid systems.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Doctoral

Grantor

Baylor University.

Year dc:date.issued

2024

Author dc:creator

• Tran, Huy Q., 1997-

Advisor dc:contributor.advisor

• Pack, Min Y.

• Drop contact line.
• Condensation.
• Oscillation.
• Wettability.

Statement dc:rights

• Baylor University works are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. Contact libraryquestions@baylor.edu for inquiries about permission.

Language dc:language.iso

en

Handle dc:identifier.uri

https://hdl.handle.net/2104/13559

OAI identifier oai:identifier

oai:baylor-ir.tdl.org:2104/13559