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Interfacial Fluid Flows and Deformations Driven by Solute Concentration Gradients
Interfacial Fluid Flows and Deformations Driven by Solute Concentration Gradients
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103202
- ISBN
- 9798314851258
- DDC
- 660
- 서명/저자
- Interfacial Fluid Flows and Deformations Driven by Solute Concentration Gradients
- 발행사항
- [Sl] : Carnegie Mellon University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 217 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Khair, Aditya S.;Tilton, Robert D.
- 학위논문주기
- Thesis (Ph.D.)--Carnegie Mellon University, 2025.
- 초록/해제
- 요약In natural and technological contexts, concentration gradients of solute molecules often arise by accident or by design. In the presence of a solid or fluid interface, these concentration gradients may drive fluid motion through phenomena including diffusio-osmotic flow and the Marangoni effect. Diffusio-osmotic flow is driven by solute-interface interactive forces distributed across a diffuse interfacial boundary layer, leading to sharp velocity gradients when tangential concentration gradients are introduced. Diffusio-osmotic flows on the surface of a colloidal particle are responsible for diffusiophoresis, the deterministic migration of a particle along a solute concentration gradient. Marangoni stresses refer to tangential gradients in interfacial tension e.g. due to adsorption of surfactant molecules, driving motion at fluid-fluid interfaces. These processes can be impactful on mass transfer of colloids and multiphase fluids: for example, diffusiophoresis has the potential to deliver particles at rates far greater than colloidal diffusion, generating recent interest (e.g. in low-cost separation technologies) since the advent of microfluidic experimental techniques. Marangoni stresses can generate convective instabilities that drive spontaneous mixing and disruption of the fluid-fluid interface, in some cases even driving spontaneous emulsification of one phase into the other to circumvent costly input of mechanical energy. Existing research on these topics deals primarily with simple solutes, neglecting self-assembly processes such as micellization, complexation, and formation of vesicles. In this dissertation, I first present an analytical calculation of the asymptotic deformations of a viscous fluid drop undergoing diffusiophoresis. Second, I present our quantification of colloidal diffusiophoresis in the presence of micellizing ionic surfactants and surfactant-polymer complexes, using a numerical transport model to identify signatures of key physical quantities- the diffusiophoretic mobility and solute diffusion coefficient-in our microfluidic experimental apparatus. Next, I turn to a novel hydrodynamic instability occuring at the oil-water interface between solutions of cationic and anionic surfactants, which we observed experimentally in certain ranges of solution pH and surfactant concentration. I explain the mechanism through a quasi-steady stability analysis and numerical simulations of the coupled chemical transport, reaction kinetics, and fluid mechanics, finding that complexation of oppositely charged surfactants drives a Marangoni instability. Finally, I present a model of interfacial convection based on diffuse interaction between a nonionic solute and a fluid-fluid interface, finding an instability criterion which is a generalization (in the relevant limits) of two previously reported convective phenomena: soluto-capillary convection for a free interface and diffusio-osmotic convection near a rigid wall.
- 일반주제명
- Chemical engineering
- 일반주제명
- Hydrologic sciences
- 일반주제명
- Fluid mechanics
- 키워드
- Microfluidics
- 기타저자
- Carnegie Mellon University Chemical Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798314851258
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■040 ▼aMiAaPQ▼cMiAaPQ
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■1001 ▼aMcKenzie, Brian E.▼0(orcid)0000-0003-4477-8845
■24510▼aInterfacial Fluid Flows and Deformations Driven by Solute Concentration Gradients
■260 ▼a[Sl]▼bCarnegie Mellon University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a217 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Khair, Aditya S.;Tilton, Robert D.
■5021 ▼aThesis (Ph.D.)--Carnegie Mellon University, 2025.
■520 ▼aIn natural and technological contexts, concentration gradients of solute molecules often arise by accident or by design. In the presence of a solid or fluid interface, these concentration gradients may drive fluid motion through phenomena including diffusio-osmotic flow and the Marangoni effect. Diffusio-osmotic flow is driven by solute-interface interactive forces distributed across a diffuse interfacial boundary layer, leading to sharp velocity gradients when tangential concentration gradients are introduced. Diffusio-osmotic flows on the surface of a colloidal particle are responsible for diffusiophoresis, the deterministic migration of a particle along a solute concentration gradient. Marangoni stresses refer to tangential gradients in interfacial tension e.g. due to adsorption of surfactant molecules, driving motion at fluid-fluid interfaces. These processes can be impactful on mass transfer of colloids and multiphase fluids: for example, diffusiophoresis has the potential to deliver particles at rates far greater than colloidal diffusion, generating recent interest (e.g. in low-cost separation technologies) since the advent of microfluidic experimental techniques. Marangoni stresses can generate convective instabilities that drive spontaneous mixing and disruption of the fluid-fluid interface, in some cases even driving spontaneous emulsification of one phase into the other to circumvent costly input of mechanical energy. Existing research on these topics deals primarily with simple solutes, neglecting self-assembly processes such as micellization, complexation, and formation of vesicles. In this dissertation, I first present an analytical calculation of the asymptotic deformations of a viscous fluid drop undergoing diffusiophoresis. Second, I present our quantification of colloidal diffusiophoresis in the presence of micellizing ionic surfactants and surfactant-polymer complexes, using a numerical transport model to identify signatures of key physical quantities- the diffusiophoretic mobility and solute diffusion coefficient-in our microfluidic experimental apparatus. Next, I turn to a novel hydrodynamic instability occuring at the oil-water interface between solutions of cationic and anionic surfactants, which we observed experimentally in certain ranges of solution pH and surfactant concentration. I explain the mechanism through a quasi-steady stability analysis and numerical simulations of the coupled chemical transport, reaction kinetics, and fluid mechanics, finding that complexation of oppositely charged surfactants drives a Marangoni instability. Finally, I present a model of interfacial convection based on diffuse interaction between a nonionic solute and a fluid-fluid interface, finding an instability criterion which is a generalization (in the relevant limits) of two previously reported convective phenomena: soluto-capillary convection for a free interface and diffusio-osmotic convection near a rigid wall.
■590 ▼aSchool code: 0041.
■650 4▼aChemical engineering
■650 4▼aHydrologic sciences
■650 4▼aFluid mechanics
■653 ▼aColloidal hydrodynamics
■653 ▼aHydrodynamic instabilities
■653 ▼aInterfacial convection
■653 ▼aMicrofluidics
■690 ▼a0542
■690 ▼a0388
■690 ▼a0204
■71020▼aCarnegie Mellon University▼bChemical Engineering.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0041
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357291▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
