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Showing 1 to 20 of 73 for “"Multiphase flows"”.
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Multiphase Flows In Vertical Pipelines
… and numerical models have been employed to model multiphase flow behavior and have been showing good agreement against experimental providing then a robust tool for the modeling of multiphase flows. Throughout this dissertation, different techniques of two-phase flow modeling through vertical …
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Computational studies of viscoelastic multiphase flows
… drops in simple shear and buoyancy driven flows. The roles of the governing dimensionless parameters: Capillary number (Ca), Deborah Number (De) and the polymer concentration parameter c, in determining deformation of drops and bubbles, are also analyzed. The numerical code permits us to …
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Multiphase flows in polymer microfluidic systems
… of segmented reagents using pressure-driven multiphase flow in microchannels is a promising technology for high throughput microfluidic bioassays. Separation and encapsulation of the target reagents with another inert fluid provide many advantages over single phase flow in microfluidic …
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Lattice Boltzmann simulations of multiphase flows
… Method (LBM) for the purpose of simulating multiphase flows relevant to Air Conditioning and Refrigeration Center (ACRC) applications. Other methodologies have been used to simulate multiphase flow including finite volume based Navier-Stokes solvers. These methods have found reasonable …
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Subpixel Resolution Schemes for Multiphase Flows
This effort explores novel sub-resolution particle center estimation algorithms for Digital Particle Tracking Velocimetry (DPIV). The errors of these new methods were classified through Monte-Carlo simulations. These schemes provide direct measurements of the apparent particle image diameter and …
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Simulation methods for polydisperse, multiphase flows using moment methods
<p>While the ability to solve for multiphase flows that contain of a distribution of properties is crucial to the accurate prediction of physical system, there is currently a lack of numerical solution methods to solve for these types of flows. In this work, three new numerical procedures are …
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Numerical Approximation of Multiphase Flows in Heterogeneous Porous Media
… contributions to numerical methods approximating multiphase flow problems in highly heterogeneous porous media. We first highlight important background information, motivations, governing equations, and past results to the numerical analysis of such problems. Second, we introduce a discontinuous …
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Thermodynamically consistent modelling and computational methods for multiphase flows
… of my PhD, which is the study of two-phase flows by using the phase-field methods. The key point for this work is the thermodynamic con- sistency. We begin by introducing an extension of the Model H to study the two-phase flows with thermocapilliary effects, where we assume that the …
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Numerical Framework for Simulating Multiphase Flows with Phase Change
… towards the goal of simulating vaporizing multiphase flows. First, the solver is verified to produce convergent solutions, regardless of the thermodynamic regime of vaporization. Second, the actual implementation of vaporization sources is unconditionally stable, making simulation practical …
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Adjoint-based optimization of multiphase flows with sharp interfaces
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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A moving mesh method for non-isothermal multiphase flows
… is developed for simulating non-isothermal multiphase flows, which are important in many technical applications such as crystal growth and welding. The method is based on the arbitrary Lagrangian Eulerian method of Li (2013). The interface is represented explicitly by mesh lines, and is …
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Nature-inspired systems exploiting porous media for multiphase flows
This thesis studies multi-phase flows within two different types of porous nature-inspired material systems: multi-layered feathers and synthetic trees. (1) How multilayered feathers enhance underwater superhydrophobicity. Inspired by ducks, here we demonstrate that air pockets can withstand up to …
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Machine learning non-local closures for turbulent anisotropic multiphase flows
… nonlocal closure scheme for turbulent multiphase fluid flows. In more detail, we use the predictions of neural nets to actively integrate in time the evolution of a turbulent anisotropic fluid flow on which bubbles that act as passive inertial tracers are being transported. The first …
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Three dimensional imaging of multiphase flows : from bubbles to sneezes
… refocusing are combined and extended to resolve multiphase flows in 3D over time. Multiple photographs of the same scene are recorded with a large depth of field by each of the cameras in an array. After calibrating the cameras, images from each of the cameras are transformed and combined at each …
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Analysis of Numerical Methods for Incompressible Multiphase Flows with Thermal Convection
… to approximate the solutions of incompressible multiphase flows with thermal convection whose dynamics is governed by the Navier-Stokes equations and the temperature equation under the Boussinesq approximation. Unlike traditional schemes that rely on using the temperature and velocity as primary …
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A Parallel Boundary Conforming Method on Adaptive Moving Meshes for Multiphase Flows
… for simulating two-dimensional incompressible flows on adaptive moving unstructured meshes. The proposed method is especially helpful for studying immiscible multiphase flow problems as the interfaces are represented explicitly by mesh lines, and the grids are able to conform the movements of …
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Microchemical systems for understanding of multiphase flows in upstream hydrocarbon and natural gas productions
… of microchemical systems to understand multiphase flows in upstream hydrocarbon and natural gas productions. Offshore petroleum and natural gas catastrophes, such as the Deepwater Horizon spill of 2010, motivate the need to understand how to minimize the introduction of potentially …
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A mechanistic investigation of nonlinear interfacial instabilities leading to slug formation in multiphase flows
… industrial applications involve the transport of multiphase flows through pipes. For instance, the design and operation of oil pipelines and production facilities relies heavily on understanding the hydrodynamics of inultiphase flow. Industrial engineers utilizes multiphase flow simulators to aid …
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A machine learning study of wind-driven runback/flow-off multiphase flows pertinent to aircraft icing phenomena
… of wind-driven runback water film (WDRWF) flows over aircraft surfaces has a significant impact on the aircraft in-flight icing process. Conventional theoretical/numerical methods cannot accurately predict WDRWF flow due to the limited comprehension of the intricate multiphase interactions …
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Mechanistic study of slug formation and evolution in high-viscosity-liquid/High-density-gas multiphase flows in channels/pipes
… of pipelines to transport heavy-oil/gas flows have raised new challenges associated with remarkably different flow regime transitions compared to conventional low-viscosity-oil/low-density-gas flows. Many traditional flow regime models for these oil/gas flows result in O(1) prediction …
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