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 41 for “"slug flow"”.
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Entrance effects in a developing slug flow
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1960.
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Nonlinear effects on interfacial wave growth into slug flow
It is known that when two fluids flow through a horizontal channel, depending on the relative velocity between the two fluids, two different instability mechanisms can create initial wave disturbances on the interface: the classic Kelvin-Helmholtz instability or shear induced instability. These …
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The transition from two phase bubble flow to slug flow
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1962.
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Multiphase slug flow characteristics and their effects on corrosion in pipelines
The study of corrosion in multiphase pipelines is usually conducted in the laboratory using single phase test systems. The results from these tests are often extrapolated to large diameter pipelines. Great errors can occur in this process.
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A study of Taylor bubbles in vertical and inclined slug flow using multiphase CFD with level set
Slug flow commonly occurs in gas and oil systems. Current predictive methods are based on mechanistic models, which require the use of closure relations to complement the conservation equations to predict integral flow parameters such as liquid holdup (or void fraction) and pressure gradient. These …
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An analysis of the pressure drop and void for a two-phase slug flow in inclined pipes.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1969.
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Application of the polynomial chaos expansion to multiphase CFD : a study of rising bubbles and slug flow
… heat transfer and single phase, incompressible flow simulations; example applications are demonstrated in Chapter 2. One of main objectives of this research was to ascertain whether this promise extends to realm of CMFD applications, and this is the topic of Chapters 3 and 4; Chapter 3 covers …
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Caracterização experimental do escoamento bifásico horizontal de fluidos reofluidificantes
… and global properties of a horizontal gas-liquid slug flow, in three different shear-thinning fluids. To do so, an experimental testing bench was assembled and validated using an air-water slug flow. Three different working fluids where prepared to be used in the testing section, where an …
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Piezoelectric flexing and output voltage of a microchannel heat engine
… motion in a microchannel heat engine. A new slug flow model is developed for droplet motion in a circular cross-section channel. The model includes friction, pressure, viscous and thermocapillary forces on the droplet. This thesis examines the concept of a piezoelectric device at one end of …
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Thermally Developing Electro-Osmotic Convection in Circular Microchannels
… developing, electro-osmotically generated flow has been analyzed for a circular microtube under imposed constant wall temperature (CWT) and constant wall heat flux (CHF) boundary conditions. Established by a voltage potential gradient along the length of the microtube, the hydrodynamics of …
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The rise of Taylor bubbles in vertical and inclined pipes
Slug flow is one of the key flow regimes encountered in multiphase flow systems. Through reviewing the literature, the researcher identified a research gap in performing a theoretical treatment to the problem, specifically using the dimensionless treatment and the order of magnitude analysis of …
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Modeling multiphase solid transport velocity in long subsea tiebacks: numerical and experimental methods.
… knowledge of critical transport velocity, flow pattern changes, phase velocity, pressure drop, particle drag and lift forces, sand/liquid/gas holdup, flow rate requirement, and tieback sizing etc. at the early design phase and during operation for process optimisation. This research …
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Heat Transfer and Hydrodynamics of Miscible/Immiscible Systems in Microchannel Devices
… while it has been proven that multiphase flows can lead to better heat transfer enhancement, most studies in the literature on flow in microchannels are on single-phase flows. In this research, and with a focus on the microchannel devices, the heat transfer enhancement and the associated …
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Slug Formation and Frequency of Slugging in Gas-Liquid Flows
When a slug forms, the liquid level in a large length of pipe drops as the slug propagates downstream. Thus two time scales enter the slug frequency analysis: one characterizing wave evolution and one involving liquid buildup. When the Froude number of the stratified flow in a horizontal pipe at …
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Combined bottom-hole pressure calculation procedure using multiphase correlations and artificial neural network models, A
… be more fully investigated to aid in multiphase flow related issues. In this study, different artificial neural network models have been trained to solve two of the major problems of bottom-hole pressure calculations - flow regime recognition and pressure gradient prediction. A support vector …
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Caracterização experimental da separação gás-líquido em uma junção do tipo T inclinada
The two-phase flows at a T-Junction is a common feature in many industrial processes, such as oil field flow lines, pipeline networks and refinery streams to divide or combine flows. When a gas-liquid mixture flows through a junction, the phases can be separated unevenly such that the qualities in …
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Mathematical modeling, simulation, and optimal design of pharmaceutical crystallizers
… anti-solvent crystallization, and 3) continuous slug-flow crystallization, which are solved by three distinct simulation methods: 1) breakage matrix with integer arithmetic, 2) method of characteristics, 3) method of moments combined with the method of lines. The population balance models are …
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Infrared Thermometry Analysis of Surface Effects in Subcooled and Saturated Boiling of Water
… work, the dynamics of subcooled and saturated flow boiling are studied, focusing on the influence of surface characteristics, visualized through advanced diagnostics capturing micro-scale phenomena. Utilizing specially crafted thin-film infrared heaters, we measured bubble dynamics parameters …
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Electrochemically mediated separations and catalysis
… reduction and oxidation environments via slug flow. This concept has broad implications because the functionality on the mediator can also be purposefully designed to deliver redox equivalents to reaction/separation environments that would be incompatible with their regeneration. By …
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Modelling and analysis of vibrations in flexible cylinders subjected to internal multiphase and external single-phase flows.
… cylinders subjected to internal two-phase slug flows and external vortex-induced vibrations (VIV) by taking into account the geometric and hydrodynamic nonlinearities. Flow-induced vibration (FIV) is a common phenomenon observed in various engineering systems such as heat exchangers, …
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