Dynamics Of Thin Liquid Films
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The Dynamics Of Thin Liquid Films
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Author : Michael Paul Ida
language : en
Publisher:
Release Date : 1995
The Dynamics Of Thin Liquid Films written by Michael Paul Ida and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
The Dynamics Of Thin Liquid Films
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Author :
language : en
Publisher:
Release Date : 2004
The Dynamics Of Thin Liquid Films written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The Dynamics Of Thin Liquid Films In Rotating Tubes
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Author : J. T. Dakin
language : en
Publisher:
Release Date : 1978
The Dynamics Of Thin Liquid Films In Rotating Tubes written by J. T. Dakin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
Thin Liquid Films
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Author : Ralf Blossey
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-05-22
Thin Liquid Films written by Ralf Blossey and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-05-22 with Science categories.
This book is a treatise on the thermodynamic and dynamic properties of thin liquid films at solid surfaces and, in particular, their rupture instabilities. For the quantitative study of these phenomena, polymer thin films (sometimes referred to as “ultrathin”) have proven to be an invaluable experimental model system. What is it that makes thin film instabilities special and interesting? First, thin polymeric films have an important range of applications. An understanding of their instabilities is therefore of practical relevance for the design of such films. The first chapter of the book intends to give a snapshot of current applications, and an outlook on promising future ones. Second, thin liquid films are an interdisciplinary research topic, which leads to a fairly heterogeneous community working on the topic. It justifies attempting to write a text which gives a coherent presentation of the field which researchers across their specialized communities might be interested in. Finally, thin liquid films are an interesting laboratory for a theorist to confront a well-established theory, hydrodynamics, with its limits. Thin films are therefore a field in which a highly fruitful exchange and collaboration exists between experimentalists and theorists. The book stretches from the more concrete to more abstract levels of study: we roughly progress from applications via theory and experiment to rigorous mathematical theory. For an experimental scientist, the book should serve as a reference and guide to what is the current consensus of the theoretical underpinnings of the field of thin film dynamics. Controversial problems on which such a consensus has not yet been reached are clearly indicated in the text, as well as discussed in a final chapter. From a theoretical point of view, the field of dewetting has mainly been treated in a mathematically ‘light’ yet elegant fashion, often making use of scaling arguments. For the untrained researcher, this approach is not always easy to follow. The present book attempts to bridge between the ‘light’ and the ‘rigorous’, always with the ambition to enhance insight and understanding - and to not let go the elegance of the theory.
Dynamics Of Thin Liquid Films
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Author : Vilhjalmur Ludviksson
language : en
Publisher:
Release Date : 1968
Dynamics Of Thin Liquid Films written by Vilhjalmur Ludviksson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Hydrodynamics categories.
Dynamics Of Thin Liquid Films Over A Spinning Disk
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Author : Kun Zhao
language : en
Publisher:
Release Date : 2020
Dynamics Of Thin Liquid Films Over A Spinning Disk written by Kun Zhao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Nonlinear Dynamics Of Thin Liquid Films On An Inclined Oscillating Plane
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Author : Elena Novbari
language : en
Publisher:
Release Date : 2006
Nonlinear Dynamics Of Thin Liquid Films On An Inclined Oscillating Plane written by Elena Novbari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
An Experimental Study On The Dynamics Of Thin Liquid Films On Heater Surfaces
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Author : Shengjie Gong
language : en
Publisher:
Release Date : 2010
An Experimental Study On The Dynamics Of Thin Liquid Films On Heater Surfaces written by Shengjie Gong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Dynamic Evolution Of Thin Liquid Films Over Curved Substrates
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Author : Xingyi Shi
language : en
Publisher:
Release Date : 2022
Dynamic Evolution Of Thin Liquid Films Over Curved Substrates written by Xingyi Shi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
We encounter thin liquid films on a daily basis. The micron-thick tear film coating the cornea ensures the clarity of our vision. Pulmonary surfactants coating the air-liquid interface in the alveoli enable us to breath. Lubricant foaming in a gear box can lead to machine degradation and unsafe operations. Textile dye solution films drying unevenly can leave undesirable marks on the fabric. A fundamental understanding of thin liquid film stability is key to optimizing the compositions of the base liquid to suit our needs and applications. In this research, we examine the effects of liquid composition and substrate materials on the dynamics of thin liquid films by building heat and mass transfer models and conducting interferometric experiments via the dynamic fluid-film interferometer. The geometry of a thin liquid film dictates that the liquid-air interactions are critical in affecting the dynamics of the films. Many such interactions can lead to an uneven distribution of surface tension, creating Marangoni flow. The interplay between the Marangoni flow and other physical forces such as capillarity and gravity govern the dynamics of most thin liquid films. A key part of the work focuses on one of the simplest systems that captures all of the major physical forces at play in a thin liquid film: evaporating binary silicone oil films over a glass dome or an air bubble. The binary silicone oil composes of two silicone oils with different viscosity, surface tension, and evaporation rate. Evaporation and the curvature of the substrates create a thin film with varying thickness and composition, thereby surface tension. In the experimental system, a thin film is formed by forcing the curved substrate upward until the apex of the substrate penetrates the initially flat air/liquid interface. The forcing is then stopped and the evolution of the film is recorded by a camera positioned directly above the thin film. Combining experimental observations and theoretical modeling, we elucidate the mechanisms behind the resulting dramatic thin film dynamics. For a binary silicone oil film over a glass dome, at low volume fractions of the less evaporative species ( 0.3%), the liquid film remains axisymmetric and is stabilized by van der Waals interactions and Marangoni flows [1]. At higher concentrations ( 0.35%), the increase in Marangoni flow leads to a film that is more susceptible to ambient disturbances, resulting in asymmetry breakage events [2]. Faster dynamics are observed for an oil film over an air bubble, due to the reduction in resistance to flow. At low volume fractions of the more evaporative species (
Instabilities And Breakup In Thin Liquid Films
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Author : Vineeth Chandran Suja
language : en
Publisher:
Release Date : 2020
Instabilities And Breakup In Thin Liquid Films written by Vineeth Chandran Suja and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Liquid films having dimensions that are relatively small in the direction normal to their surface are commonly referred to as thin liquid films. Due to their prevalence in nature and due to their unique geometrical characteristics, a comprehensive understanding of thin film dynamics including instabilities and break-up within thin liquid films is of fundamental and practical interest. Practically this understanding is crucial to tuning the stability thin films in a number of important applications such as for stabilizing foams in foods and beverages, destabilizing foams in lubricants, avoiding surface irregularities in liquid coatings and treating ophthalmic disorders originating from the unnatural breakup of the tear film. Fundamentally, the microscopic thickness of these liquid films along with their large surface to volume ratio presents a convenient framework to investigate characteristics of two dimensional flows, and probe the effects of surface phenomenon such as evaporation and surfactant dynamics on fluid flows. Motivated by the importance of thin liquid films, in this thesis, we experimentally investigate the instabilities and break-up within thin liquid films. In the first part of the thesis (Chapters 2 - 4), we develop and optimize experimental tools and protocols for systematically studying thin liquid films. Notably, we show that single bubble/drop experiments are a convenient and complementary technique to study the dynamics of thin liquid films. Subsequently, we detail a new technique for automatically and robustly measuring the spatiotemporal thickness of thin liquid films - hyperspectral interferometry coupled with machine learning. Finally, we will also establish the operating regimes within which the size of bubbles formed on capillaries for single bubble experiments can be precisely controlled to avoid an air compressibility driven shape instabilities. In the subsequent parts of the thesis we utilize the developed tools to study four different problems - Bubble stability in worm like micellar (WLM) polymer solutions (Chapter 5), Lubricant foaming (Chapters 6 - 8), Drying of thin polymer films (Chapter 9) and Dewetting of the tear film (Chapter 10). In Chapter 5, we explore a problem relevant for the cosmetic industry, and characterize the drainage characteristics of thin films between bubbles and flat wormlike micellar solution - air interfaces. The supramolecular structure and elasticity of the wormlike micelles alters the dynamics of film drainage in WLM as compared to those in thin films containing pure surfactants. The unique features of film drainage include film elasticity driven 'dimple recoil' and a single step transition to a Newton black film beyond a critical film thickness. In Chapters 6 - 8, we explore a problem relevant for the lubricant industry, and study the stability of thin liquid films in lubricants with and without antifoams. Utilizing single bubble experiments, we reveal that the stability of thin films between bubbles in lubricant base oils are enhanced by Marangoni flows driven by the differential evaporation of the various components in the oil. Fundamentally, we also show that the spatiotemporal characteristics of these Marangoni flows are regulated by the concentration and volatility of the volatile species in the oil. Interestingly when the concentration of the volatile species approaches 50%, evaporation driven Marangoni flows become chaotic, with disordered spatial structure, chaotic fluctuations, spatially invariant mean film thickness statistics, high sensitivity to initial conditions, rapidly decaying spatial correlation and a power spectrum for thickness fluctuation that obeys a power law scaling that closely resembles the Kolmogorov's -5/3rd scaling. In the presence of filtered lubricants with antifoams, we reveal that the stability of thin films are positively correlated to the number of filtration cycles, and inversely correlated to the nominal filter pore size and the initial antifoam concentration. In Chapter 9 we explore a problem relevant for film coating, and study the drying of aqueous polymer solutions. Depending on the polymer concentration and the polymer diffusivities, we show that a classical Rayleigh-Taylor instability can develop within the drying solution. We also present the scaling laws describing the onset time of the instability as a function of the physical properties and initial polymer concentrations of the solutions. In Chapter 10 we report a platform to characterize the thickness of the tear film in vivo. By qualitatively comparing the dewetting characteristics observed in vivo with in vitro experiments, we will show that the mechanisms of dewetting is influenced by the presence of interfacial rheology. Further we also reveal that the spatial locations that are prone to dewetting are determined by the presence of interfacial rheology and the spatiotemporal drainage characteristics of the tear film. In Chapter 11 we summarize the findings in this thesis and discuss a number of interesting venues for future research.