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 26 for “"film flow"”.
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Gravity-driven continuous thin film flow over topography
… theoretical investigation of gravity-driven thin film flow over various topographical features, the effect of inertia being of particular interest. The problem is solved using a hierarchy of models based, in order of decreasing complexity, on (i) the full Navier-Stokes system of equations; (ii) a …
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The numerical simulation of thin film flow over heterogeneous substrates
… 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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Influence of side walls and undulated topography on viscous gravity-driven film flow
While a gravity-driven viscous film flow down an inclined flat plane of infinite extent can be described by an easy analytical solution, flow problems in nature, like glacier movements or the liquid film on the human eye are much more complex. Also to optimize a large number of technical …
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The experimental study and numerical simulation of falling liquid film flow on horizontal tubes
… been found so far in studies of water falling film up to 100 mm intertube spacing. No simulation analysis of film thickness under influence of intertube spacing in 3 dimensional models. Therefore, to the best of author’s knowledge, this research aims to illuminate the effects of intertube …
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The mitigation of crystallization fouling in a falling-film flow: A self-cleaning mechanism driven by flow and wetting behavior
… to the formation of the fouling layer, increased flow resistance, and performance/product line interruption due to the cleaning routine. During regular cleaning and pre-or-pro anti-scaling treatment, commonly utilized hazardous chemicals not only add operational costs but also leave a significant …
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Experimentelle Untersuchung der Strömungscharakteristik und des Wärmeübergangs bei welligen Rieselfilmen
… present work experimental investigations of the flow characteristic and heat transport of wavy silicone oil films were accomplished with different angles of inclination (13°, 30°, 60° and 90°) and Kapitza numbers, which allow a deeper view into the structure and the heat transport phenomena. From …
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A new experimental approach of characterizing two-phase flow and heat transfer in plate heat exchangers
Heat transfer of two-phase flow is not well characterized for plate heat exchangers (PHEs) despite their wide applications. No general correlations in the public domain are capable of accounting for all different effects of geometrical parameters, working fluids and operating conditions. The …
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Squeeze-film flows, with application to the human knee joint
The squeeze-film flow of a thin layer of Newtonian fluid filling the gap between either a flat or a curved rigid impermeable solid coated with a thin rigid or elastic layer and moving under a prescribed constant load towards a thin rigid porous bed of uniform thickness coating a stationary flat …
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Hydrodynamics Of Trickle Bed Reactors: Measurements And Modeling
… focuses on experimental characterization of the flow distribution, and development of computational fluid dynamics: CFD) model of trickle flow. The experimental study has been performed to examine the quality of liquid phase distribution in a high pressure system. The results were provided in …
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Steady flow and stability analysis of a thin film over variable topography
The gravity-driven film flow over a flat inclined surface is a fundamental problem in fluid mechanics. This flow appears in many significant industrial, environmental and biomedical processes. Although this flow is a classic problem in fluid mechanics, nevertheless, in the real world, the …
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Multiphase Flow at Small Scales
Multiphase flow in confined spaces is prevalent in many natural and scientific phenomena, from subsurface processes to biological processes. In this thesis, we introduce innovative experimental methods to explore the impact of wettability on multiphase flow in porous media using microfluidics, and …
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A Mathematical Analysis of Digestive Processes in a Model Stomach
… a simplified, local description of the flow close to the wall, we may gain an insight into the mechanisms behind this behaviour. This description focuses on the mixing of two layers of creeping fluid through temporal instability of the perturbed fluid interface. Some attention is also …
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TRACE code validation of boiling water reactor spray cooling injection into a SVEA fuel assembly
… quantification model were the countercurrent flow limiting (CCFL) model constant and rod/wall emissivity, emphasizing that detailed understanding of CCFL and an accurately determined radiation model is essential for accurate simulation of emergency BWR spray cooling systems. For the physical …
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Partial Differential Equations of Thin Liquid Films: Analysis and Numerical Simulation
… problems related to Marangoni-driven thin liquid films. The first compares two models for the motion of a contact line: the precursor model and the Navier slip model. We restrict attention to traveling wave solutions of the thin film PDE for a film driven up an inclined planar solid surface by a …
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Aqueous Atmospheric Species, a Dual Study: 1. Comparison of the Effects of Temperature, Oxygen Level, Ionic Strength, and pH on the Reaction of Benzene with Hydroxyl Radicals at the Air-water Interface to the Bulk Aqueous Phase. 2. Determination of Carbonyl Compounds in Fog Water Samples via Online Concentration and HPLC
… studied in both a bulk-phase reactor and a thin film flow-tube reactor as a laboratory study. For both reactor systems, temperature, pH, ionic strength, and the concentration of oxygen were varied to simulate fog event conditions. Using the thin-film reactor, in particular, has the advantage in …
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Flow fields created by impinging liquid jets and applications in cleaning
… sustainable cleaning systems, I have studied the flow field created by impinging liquid jets and their application in cleaning. On impingement of a liquid jet onto a surface, the liquid spreads radially outwards until it reaches a point where the liquid film changes its thickness abruptly. This …
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Mathematical problems arising in interfacial electrohydrodynamics
… work we consider the nonlinear stability of thin films in the presence of electric fields. We study a perfectly conducting thin film flow down an inclined plane in the presence of an electric field which is uniform in its undisturbed state, and normal to the plate at infinity. In addition, the …
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On a Cartesian cut-cell methodology for simulating atmospheric ice accretion on aircraft
… involved prevent designing dynamically similar flows making traditional aeronautical engineering tools such as wind tunnel experiments not suitable. Therefore, computational fluid dynamics (CFD) methods have proved an attractive alternative to study atmospheric icing effects. However, most …
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Development and validation of a thermodynamic model for predicting mode transitions in falling film flows over horizontal tubes
Horizontal-tube, falling-film heat and mass exchangers are important to many industries, with example applications in thermal desalination, vapor compression machines, absorption chillers, and natural gas liquefaction. Falling-film heat and mass exchangers are attractive for these applications …
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