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Fluid Interfacial Dynamics: From Dro...

Chen, Zih-Yin,

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Fluid Interfacial Dynamics: From Droplets to Thin Films /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Fluid Interfacial Dynamics: From Droplets to Thin Films // Zih-Yin Chen.
Author:	Chen, Zih-Yin,
Description:	1 electronic resource (129 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
Contained By:	Dissertations Abstracts International86-01B.
Subject:	Fluid mechanics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31327964
ISBN:	9798383226292

Fluid Interfacial Dynamics: From Droplets to Thin Films /
Chen, Zih-Yin,

Fluid Interfacial Dynamics: From Droplets to Thin Films /Zih-Yin Chen. - 1 electronic resource (129 pages)

Source: Dissertations Abstracts International, Volume: 86-01, Section: B.

Many natural processes and industrial applications involve the understanding and modeling of interfacial fluid dynamics. Examples include the coating of a substrate with a liquid, the removal of liquid films from substrates, transport processes, droplets impact on substrates, etc. Given the ubiquity and significance of interfacial fluid flows, the overall goal of this thesis is to advance our fundamental understanding of interfacial fluid dynamics through theoretical modeling. To achieve this goal, we conduct three studies related to interfacial dynamics involving droplets and liquid films: (i) droplet impact dynamics with granular materials, (ii) droplet dynamics with an air jet, and (iii) dynamics of a liquid film with an undulating surface.Motivated by spray coating processes, we investigate how the presence of particles on a substrate changes the droplet impact dynamics. We analyze the spreading dynamics and splashing criterion of an impacting droplet on a layer of particles. A theoretical model is developed to consider the momentum of the spreading liquid and the time-dependent distribution of particles. Additionally, we establish a droplet splashing criterion based on the interaction between the impacting droplet and the particles. Our results provide insight into how the presence of particles lowers the critical impact velocity at which a droplet exhibits splashing, as the particle area fraction is systematically increased.We then focus on the dynamics of a partially-wetting droplet under an impinging air jet. We built a two-dimensional lubrication model of the droplet that incorporates the external pressure of the impinging turbulent jet, in addition to the capillary and hydrostatic pressures of the droplet. Also, the simulations of the contact-line motion by using precursor film and disjoining pressure allows us to capture the physics of different droplet behaviors, which had previously been observed experimentally. Our simulations exhibit a comparable time-scale of droplet deformations and similar outcomes as the experimental observations. We also obtain the analytical steady-state solutions of the droplet shapes and construct the minimum criteria for droplet splitting and depinning.Lastly, we investigate the interfacial dynamics of a thin liquid film over an undulating solid substrate. To explore the physical mechanisms of free surface flows driven by periodic undulations, we developed a two-dimensional thin-film mathematical model. The model combines the effects of inertia, viscosity, gravity, and surface tension in a tractable way. Our model reveals that in the regime where gravity dominates over surface tension (i.e., large Bond number, Bo), the effects of surface tension drop out of the analysis, allowing the flow rate to only depend on Re and Ca/Bo, where Ca is the capillary number. In this same regime, we learn that inertia (Re) tends to enhance the flow rate, while increasing Ca/Bo reduces the flow rate.

English

ISBN: 9798383226292Subjects--Topical Terms:

528155
Fluid mechanics.
Subjects--Index Terms:

Droplets

Fluid Interfacial Dynamics: From Droplets to Thin Films /
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245 1 0 $a Fluid Interfacial Dynamics: From Droplets to Thin Films / $c Zih-Yin Chen.
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300 $a 1 electronic resource (129 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
500 $a Advisors: Lee, Sungyon Committee members: Shen, Lian; Dutcher, Cari; Longmire, Ellen; Kumar, Satish.
502 $b Ph.D. $c University of Minnesota $d 2024.
520 $a Many natural processes and industrial applications involve the understanding and modeling of interfacial fluid dynamics. Examples include the coating of a substrate with a liquid, the removal of liquid films from substrates, transport processes, droplets impact on substrates, etc. Given the ubiquity and significance of interfacial fluid flows, the overall goal of this thesis is to advance our fundamental understanding of interfacial fluid dynamics through theoretical modeling. To achieve this goal, we conduct three studies related to interfacial dynamics involving droplets and liquid films: (i) droplet impact dynamics with granular materials, (ii) droplet dynamics with an air jet, and (iii) dynamics of a liquid film with an undulating surface.Motivated by spray coating processes, we investigate how the presence of particles on a substrate changes the droplet impact dynamics. We analyze the spreading dynamics and splashing criterion of an impacting droplet on a layer of particles. A theoretical model is developed to consider the momentum of the spreading liquid and the time-dependent distribution of particles. Additionally, we establish a droplet splashing criterion based on the interaction between the impacting droplet and the particles. Our results provide insight into how the presence of particles lowers the critical impact velocity at which a droplet exhibits splashing, as the particle area fraction is systematically increased.We then focus on the dynamics of a partially-wetting droplet under an impinging air jet. We built a two-dimensional lubrication model of the droplet that incorporates the external pressure of the impinging turbulent jet, in addition to the capillary and hydrostatic pressures of the droplet. Also, the simulations of the contact-line motion by using precursor film and disjoining pressure allows us to capture the physics of different droplet behaviors, which had previously been observed experimentally. Our simulations exhibit a comparable time-scale of droplet deformations and similar outcomes as the experimental observations. We also obtain the analytical steady-state solutions of the droplet shapes and construct the minimum criteria for droplet splitting and depinning.Lastly, we investigate the interfacial dynamics of a thin liquid film over an undulating solid substrate. To explore the physical mechanisms of free surface flows driven by periodic undulations, we developed a two-dimensional thin-film mathematical model. The model combines the effects of inertia, viscosity, gravity, and surface tension in a tractable way. Our model reveals that in the regime where gravity dominates over surface tension (i.e., large Bond number, Bo), the effects of surface tension drop out of the analysis, allowing the flow rate to only depend on Re and Ca/Bo, where Ca is the capillary number. In this same regime, we learn that inertia (Re) tends to enhance the flow rate, while increasing Ca/Bo reduces the flow rate.
546 $a English
590 $a School code: 0130
650 4 $a Fluid mechanics. $3 528155
650 4 $a Physics. $3 516296
650 4 $a Engineering. $3 586835
650 4 $a Aerospace engineering. $3 1002622
650 4 $a Mechanics. $3 525881
653 $a Droplets
653 $a Interfacial fluid dynamics
653 $a Thin films
653 $a Air jet
690 $a 0204
690 $a 0346
690 $a 0537
690 $a 0538
690 $a 0605
710 2 $a University of Minnesota. $b Mechanical Engineering. $e degree granting institution. $3 3765791
720 1 $a Lee, Sungyon $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-01B.
790 $a 0130
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31327964