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Showing 1 to 20 of 28 for “"thin 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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Self-propulsion of small droplets on thin liquid films
… of small 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 …
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Studies of Thin Liquid Films Confined between Hydrophobic Surfaces
… It 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 …
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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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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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Large Scale Hydrodynamic Simulations of Emulsions and Foams
… from 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 …
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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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Studies on the stability of thin films in bubble-particle adhesion
… critical 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 …
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Modeling Flotation from First Principles Using the Hydrophobic Force as a Kinetic Parameter
… relies on controlling the stability of the thin liquid films (TLFs) of water formed between minerals and air bubbles (wetting film), air bubbles (foam film), and mineral particles (colloid films). In flotation, a desired mineral is rendered hydrophobic by surfactant coating as a means to …
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Instabilities in particle-laden flows
… whether the granular media acts like a solid, a liquid or a gas. Moreover, the flow of thin liquid films on solid surfaces is a significant phenomenon in nature and in industrial processes (e.g. manufacture of computer chips, solar power cells, capacitors, etc.), where uniformity and completeness …
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Reduced model for particle laden flow
The flow of thin liquid films on solid surfaces is a significant phenomenon in nature and in industrial processes where uniformity and completeness of wetting are paramount in importance. It is well known that when a clear viscous fluid flows down an inclined surface under gravity, after some time, …
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Thinning and turbulence in aqueous films
This thesis covers 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 …
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Enhanced droplet spreading due to thermal fluctuations
The dynamics of thin film liquid interfaces (< 100 nm) play dominant roles in many macroscale phenomena, such as droplet break up, evaporation of a meniscus, boiling and heat transfer, and thin film dynamics. These processes are can be used in the manufacturing of microelectronics and biomedical …
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Surface and Hydrodynamic Forces in Wetting Films
… to be collected on the surface of a bubble, the thin liquid films (or wetting films) of water formed in between must rupture. According to the Frumkin-Derjaguin isotherm, it is necessary that wetting films can rupture when the disjoining pressures are negative. However, the negative disjoining …
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Pore-scale Interfacial and Transport Phenomena in Hydrocarbon Reservoirs
… method that relies on the modification of thin brine films in OBR systems by salinity change. A systematic study of the structure, disjoining pressure, and dynamic properties of these thin brine films was performed. As brine films are squeezed down to sub-nanometer scale, the structure of …
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The numerical simulation of thin film flow over heterogeneous substrates
Considerable progress in the understanding of thin film flow over surfaces has been achieved thanks to lubrication theory which enables the governing Navier-Stokes equations to be reduced to a more tractable form, namely a coupled set of partial differential equations. These are solved numerically …
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