Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 49 for “"Liquid Films"”.
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Surface Forces in Thin Liquid Films
Thin liquid films (TLFs) of water are ubiquitous in daily lives as well as in many industrial processes. They can be formed between two identical phases, as in colloid films between two macroscopic surfaces and foam films between two air bubbles; and between two dissimilar phases, as in wetting …
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Modeling and Analysis of Falling Liquid Films
… this work, we consider the dynamics of falling liquid films in various geometries. We first ex- amine the dynamics of a thin film formed by a distributed liquid source on a vertical solid wall. The mathematical model is derived using the lubrication approximation and includes the effects of …
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An interferometric study of spreading liquid films
… study of viscous Newtonian and non-volatile liquids spreading on smooth horizontal and inclined substrates is presented. A phase-modulated interference microscope was used to enable the simultaneous measurement of both the inner (microscopic) length scale and the outer (macroscopic) flow …
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Self-propulsion of small droplets on thin liquid films
… droplets below the capillary length on thin liquid films. At film temperatures above the boiling point of the droplet and lower film viscosities, we observe that droplets can propel at velocities up to 16cm/s. We predict the droplet velocities using a model that scales thin oil film viscous …
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Studies of Thin Liquid Films Confined between Hydrophobic Surfaces
… is believed that the water molecules in the thin liquid films (TLFs) of water form clusters as a means to reduce their free energy when they cannot form H-bonds to neighboring hydrophobic surfaces. Dissolved gas molecules should enhance the stability of structured cluster due to the van der Waals …
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Thin liquid films with nanoparticles and rod-like ions as models for nanofluidics
… very complex, there is often a predominance of liquid interfaces or the fluid contains charged or differently shaped colloids. The effects, promoted by these additives, are far from being completely understood and interesting questions arise with regards to the confinement of such complex …
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Surface Forces in Thin Liquid Films of H-Bonding Liquids Confined between Hydrophobic Surfaces
… macroscopic hydrophobic surfaces in H-bonding liquids, including water, ethanol, and water-ethanol mixtures. The first part of the present study involves the measurement of the hydrophobic forces in the thin liquid films (TLFs) confined between two identical hydrophobic surfaces of contact …
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Relaxations in molecularly thin simple liquid films: Linear viscoelasticity and non-linear response to shear
… non-linear response of molecularly thin simple liquid films confined between two solid surfaces were studied. The method was to measure the resistance to applied oscillatory shear deformation as a function of frequency and amplitude of deformation, film thickness and normal pressure using the …
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The effect of polymer additives on the hydrodynamic stability and nonlinear evolution of thin liquid films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1996.
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Hydrodynamic stability of liquid films adjacent to incompressible gas streams including effects of interface mass transfer
A theoretical study of linear stability of a gas/liquid interface with and without evaporation at the interface is presented. The zero mass transfer problem is solved for linear mean velocity profiles in both gas and liquid. The mass transfer problem is solved for small rates of evaporation, which …
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Large Scale Hydrodynamic Simulations of Emulsions and Foams
… homogenous linear shear, or formation of thin liquid films. Though the results of the present study come from a two-dimensional model, real systems will exhibit the same qualitative behavior; however, the transition points will be shifted due to the different packing arrangements possible with …
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Thinning and turbulence in aqueous films
… the topic ”Thinning and Turbulence in Aqueous Films”. Experimental studies in two-dimensional systems gained an increasing amount of attention during the last decade. Thin liquid films serve as paradigms of atmospheric convection, thermal convection in the Earth’s mantle or turbulence in …
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Derivation of an Evolution Equation for Two-Dimensional Waves on Thin Films
We examine wave propagation on thin liquid films subjected to gravity, fluid friction, surface tension, and Marangoni effects. The physical configuration is a thin liquid layer on a planar incline. Following previous studies, the Marangoni effect is incorporated by a constant surface tension …
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Singularities in Free Surface Flows
… the interface separating two or more phases or liquids are unknown apriori, are commonplace in industrial applications and nature. Distribution of drop sizes, coalescence rate of drops, and the behavior of thin liquid films are crucial to understanding and enhancing industrial practices such as …
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Particle-stabilised foams and foam films
… and understand the properties of foams and foam liquid films stabilised by colloidal solid particles, in the absence of any surface active substances, e.g. surfactants. Foams occur as end products or during the processing of products in many industries, including detergents, food and the cosmetic …
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Studies on the stability of thin films in bubble-particle adhesion
… rupture thicknesses (H<sub>C</sub>) of thin liquid films between air bubbles and solid surfaces have been measured using an optical interferometry technique. The results of the measurements show that H<sub>C</sub> increases with the increasing hydrophobicity of a solid and varies inversely …
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