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Determination Of Interfacial Rheological Properties Through Microgravity Oscillations Of Bubbles And Drops

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Determination Of Interfacial Rheological Properties Through Microgravity Oscillations Of Bubbles And Drops

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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-05-30

Determination Of Interfacial Rheological Properties Through Microgravity Oscillations Of Bubbles And Drops written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-30 with categories.

This report summarizes our derivations of analytical expressions for the frequencies and damping constants for small-amplitude axisymmetric shape oscillations of a liquid drop suspended in an immiscible fluid host in microgravity. In particular, this work addresses large Reynolds number shape oscillations and focuses on the surface rheological effects that arise from the presence of insoluble surfactants at the interface. Parameters characterizing viscous effects from the bulk phases, surface viscous effects, Marangoni effects from the surface advection and diffusion of surfactants, and the Gibbs elasticity are all considered and analyzed to determine the relative importance of each contribution. Supplementing the analytical treatment for small-amplitude oscillations, a numerical boundary integral equation formulation is developed for the study of large-amplittide axisymmetric oscillations of a drop in vacuum. The boundary integral formulation is an extension of classical potential flow theory and approximately accounts for viscous effects in the bulk fluid as well as the surface viscous and Marangoni effects resulting from an insoluble surfactant contaminating the interface. Theoretical and numerical results are presented for four distinct cases. These, range from the case when the effects of the surfactants are 'negligible' to 'large' when compared to the viscous effects in the bulk phases. The feasibility of the non-contact measurement of the surface parameters, using experimental observations for the oscillation frequencies and damping constants of drops and bubbles, is discussed.Nadim, Ali and Rush, Brian M.Glenn Research CenterBUBBLES; DROPS (LIQUIDS); MICROGRAVITY; OSCILLATIONS; RHEOLOGY; MARANGONI CONVECTION; VISCOUS FLOW; REYNOLDS NUMBER; INTEGRAL EQUATIONS

Transport Processes At Fluidic Interfaces

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Author : Dieter Bothe
language : en
Publisher: Birkhäuser
Release Date : 2017-07-13

Transport Processes At Fluidic Interfaces written by Dieter Bothe and has been published by Birkhäuser this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-13 with Mathematics categories.

There are several physico-chemical processes that determine the behavior of multiphase fluid systems – e.g., the fluid dynamics in the different phases and the dynamics of the interface(s), mass transport between the fluids, adsorption effects at the interface, and transport of surfactants on the interface – and result in heterogeneous interface properties. In general, these processes are strongly coupled and local properties of the interface play a crucial role. A thorough understanding of the behavior of such complex flow problems must be based on physically sound mathematical models, which especially account for the local processes at the interface. This book presents recent findings on the rigorous derivation and mathematical analysis of such models and on the development of numerical methods for direct numerical simulations. Validation results are based on specifically designed experiments using high-resolution experimental techniques. A special feature of this book is its focus on an interdisciplinary research approach combining Applied Analysis, Numerical Mathematics, Interface Physics and Chemistry, as well as relevant research areas in the Engineering Sciences. The contributions originated from the joint interdisciplinary research projects in the DFG Priority Programme SPP 1506 “Transport Processes at Fluidic Interfaces.”

Nasa S Microgravity Research Program

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Author :
language : en
Publisher:
Release Date : 2000

Nasa S Microgravity Research Program written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.

Nasa Microgravity Research Program

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Author :
language : en
Publisher:
Release Date : 1999

Nasa Microgravity Research Program written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.

Nasa S Microgravity Science Research Program

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Author :
language : en
Publisher:
Release Date : 1996

Nasa S Microgravity Science Research Program written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.

Microgravity Science And Applications Bibliography 1991 Revision

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Author : United States. Office of Space Science and Applications
language : en
Publisher:
Release Date : 1992

Microgravity Science And Applications Bibliography 1991 Revision written by United States. Office of Space Science and Applications and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Alloys categories.

Nasa Technical Memorandum

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Author : United States. National Aeronautics and Space Administration
language : en
Publisher:
Release Date : 1992

Nasa Technical Memorandum written by United States. National Aeronautics and Space Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Aeronautics categories.