Air entrainment dynamics of droplet impact on thin films : from Newtonian to non-Newtonian fluids and its applications.

He, Ziwen, 1995-

Air entrainment dynamics of droplet impact on thin films : from Newtonian to non-Newtonian fluids and its applications.

dc.contributor.advisor	Pack, Min Y.
dc.creator	He, Ziwen, 1995-
dc.creator.orcid	0000-0002-1949-2805
dc.date.accessioned	2024-07-30T12:43:23Z
dc.date.available	2024-07-30T12:43:23Z
dc.date.created	2023-12
dc.date.issued	2023-12
dc.date.submitted	December 2023
dc.date.updated	2024-07-30T12:43:23Z
dc.description.abstract	Drop impacts on thin liquid films are commonplace in various natural and industrial contexts. Before a droplet can wet solid or liquid surfaces, it’s imperative that the layer of surrounding fluid (typically air) separating the two interfaces ruptures. Recent studies, revealed by advanced optics, have delineated the relationship between micrometer-thick intervening air layers and the dynamics of millimetric droplet impacts. In this investigation, we delve into the interrelationship between the air layer and the characteristics of the impacting droplets, encompassing both Newtonian and non-Newtonian fluids. We embark with an exploration of Newtonian fluid droplet impacts. Chapter Two focuses on the deformability of thin liquid film with varying thicknesses (hL ∼ O(10^0 µm) − O(10^2 µm)). This flexibility is deformability in ascertaining the outcomes of droplet impacts by mediating air drainage dynamics. In Chapter Three, we transition to the examination of the role played by vapor pressure in the impacts of volatile droplets on thin viscous oil films hL ≈ 2 µm. This leads to the discovery of a bifaceted wetting behavior for acetone-IPA mixture droplets. In Chapter Four, our focus shifts to polymeric droplets spanning from dilute to semi-dilute unentangled regimes when impacting thin viscous oil films. Here, a conspicuous correlation emerges between polymer concentration and air film morphologies. Chapter Five broadens the scope to assess the influence of non-Newtonian flow properties on droplet impact dynamics. This includes investigations into capillary wave generation and progression, and the central collapse mode induced by the capillary waves. To conclude, this study provides a comprehensive study on air layer dynamics during droplet impacts, bridging Newtonian to non-Newtonian fluids. Our research elucidates the onset of wetting but offers promising outcomes that might be leveraged as innovative tools for examining polymer rheology. This is a pivotal component for scenarios involving non-Newtonian droplet impacts.
dc.format.mimetype	application/pdf
dc.identifier.uri
dc.identifier.uri	https://hdl.handle.net/2104/12864
dc.language.iso	English
dc.rights.accessrights	No access – contact librarywebmaster@baylor.edu
dc.title	Air entrainment dynamics of droplet impact on thin films : from Newtonian to non-Newtonian fluids and its applications.
dc.type	Thesis
dc.type.material	text
local.embargo.lift	2025-12-01
local.embargo.terms	2025-12-01
thesis.degree.department	Baylor University. Dept. of Mechanical Engineering.
thesis.degree.grantor	Baylor University
thesis.degree.name	Ph.D.
thesis.degree.program	Mechanical Engineering
thesis.degree.school	Baylor University