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Latooij, C.A. (author)A recent study [Rossen et al., 2011] developed a fractional-flow model (an extension of the Buckley-Leverett theory for a waterflood) for non-Newtonian two-phase flow (surfactant solution and gas) around a well. In this fractional-flow model two effects are represented: the decrease in water saturation Sw during gas injection in a SAG process...bachelor thesis 2012
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De Zeeuw, J.Q. (author)Recently, an amount of methane was produced with hot water in the Ammerlaan geothermal field. The presence of methane influences fluid properties and fluid flow in the well, leading to changes in the pressure and temperature drop in the producing well. This study presents a model for non-isothermal two-phase flow in geothermal wells. In this...bachelor thesis 2012
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Derakhshani, S.M. (author), Schott, D.L. (author), Lodewijks, G. (author)Dust emissions can have significant effects on the human health, environment and industry equipment. Understanding the dust generation process helps to select a suitable dust preventing approach and also is useful to evaluate the environmental impact of dust emission. To describe these processes, numerical methods such as Computational Fluid...conference paper 2013
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Lesage, A.C. (author), Dervieux, A. (author), Allain, O. (author)In the case of incompressible flow, the level set method does not ensure mass conservation and it has to be enforced. The usual global mass conservation presents unacurracy in the case of separated phases of one fluid. In this paper, we propose an alternative local mass conservation based local volume fluxes. We apply our method to test cases...conference paper 2006
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Ganesan, S. (author), Tobiska, L. (author)This work is devoted to the accurate simulation of incompressible two phase flows. The core of our methodology is the use of interface resolving meshes and the arbitrary Lagrangian-Eulerian (ALE) description of the fluid kinematics. Our numerical scheme is based on second order finite elements, a fractional step ? time discretisation, and a...conference paper 2006
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Cuenot, B. (author), Boileau, M. (author), Pascaud, S. (author), Mossa, J.B. (author), Riber, E. (author), Poinsot, T. (author), Bérat, C. (author)Large Eddy Simulation (LES) is now recognized as an efficient numerical tool to predict gaseous combustion in industrial burners, and a number of examples of applications can be found in the literature. In these examples, the accuracy and the predictive capacity of LES are clearly demonstrated, even for unsteady phenomena. However most...conference paper 2006
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Pothof, I.W.M. (author), Clemens, F.H.L.R. (author)Air-water flow is an undesired condition in water pipelines and hydropower tunnels. Water pipelines and wastewater pressure mains in particular are subject to air pocket accumulation in downward sloping reaches, such as inverted siphons or terrain slopes. Air pockets cause energy losses and an associated capacity reduction. Despite its practical...conference paper 2012
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Guillard, H. (author), Labois, M. (author)This paper presents a hierarchy of compressible two-phase flow models. It is shown that using Chapman-Enskog expansions in the limit of zero relaxation time toward the various equilibria that exist in these flows, a full set of models of decreasing complexity can be constructed. At the top of this hierarchy, we have a complete seven equation...conference paper 2006
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Hoang, D.A. (author), Van Steijn, V. (author), Portela, L.M. (author), Kreutzer, M.T. (author), Kleijn, C.R. (author)Modeling of low-Capillary number segmented flows in microchannels is important for the design of microfluidic devices. We present numerical validations of microfluidic flow simulations using the volume-of-fluid (VOF) method as implemented in OpenFOAM. Two benchmark cases were investigated to ensure the reliability of OpenFOAM in modeling complex...conference paper 2012
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Schmehl, R. (author), Maier, G. (author), Wittig, S. (author)The two phase flow in the premix duct of a LPP combustor is computed using a Lagrangian droplet tracking method. To reproduce the characteristic spray structure of an air-assisted pressure-swirl atomizer, a sheet spray model is de-rived from measured sheet parameters and combined with an advanced concept for modeling secondary atomization...conference paper 2000
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Wemmenhove, R. (author), Loots, G.E. (author), Veldman, A.E.P. (author)The numerical simulation of hydrodynamic wave loading on different types of offshore structures is important to predict forces on and water motion around these structures. This paper presents a numerical study of the effects of two-phase flow on an offshore structure subject to breaking waves. The numerical model, an improved Volume Of Fluid ...conference paper 2006
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Schmehl, R. (author), Klose, G. (author), Maier, G. (author), Wittig, S. (author)Representing two different conceptual approaches, either Eulerian continuum models or Lagrangian particle models are commonly applied for the numerical description of dispersed two phase flows. Taking advantage of the positive features inherent to each model, a combination approach is presented in this study for the efficient computation of...conference paper 1998
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Wittig, S. (author), Hallmann, M. (author), Scheurlen, M. (author), Schmehl, R. (author)A new Eulerian model for the computation of turbulent evaporating sprays in recirculating flows is derived. It comprises droplet heating and evaporation processes by solving separate transport equations for the droplet's temperature and diameter. Full coupling of the droplet and the gaseous phase is achieved by the exchange of source terms due...conference paper 1993
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Giordano, M. (author), Bonfiglioli, A. (author), Magi, V. (author)A parallel finite element model for incompressible laminar two-phase flows is presented. A two-fluid model, describing the laminar non-equilibrium flow of two incompressible phases, is discretized by means of a properly designed Streamline Upwind Petrov-Galerkin (SUPG) finite element procedure. Such a procedure is consistent with a continuous...conference paper 2006
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De Martin, L. (author), Bouwman, W.G. (author), Van Ommen, J.R. (author)recent years, the interest in fluidization as a mean to process nanoparticles is strongly increasing. Due to the small size of the nanoparticles, which makes van der Waals forces predominate, they do not fluidize as single particles but as agglomerates. Various researchers using settling experiments and bed expansion measurements conclude that...conference paper 2013
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Poelma, C. (author), Gurung, A. (author)Ultrasound Imaging Velocimetry (UIV, also known as 'echo-PIV') has, since its introduction a decade ago, been regarded as a promising tool to characterize non-transparent flows. Prime application examples are particle-laden flows and (in vivo) blood flow. Virtually all studies so far have been validation/comparison studies in laminar flow. In...conference paper 2016
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Hosseini, Babak Sayyid (author), Möller, M. (author)In this work, we consider a Cahn–Hilliard phase field-based computational model for immiscible and incompressible two-component liquid flows with interfacial phenomena. This diffuse-interface complex-fluid model is given by the incompressible Navier–Stokes–Cahn–Hilliard (NSCH) equations. The coupling of the flow and phase field equations is...conference paper 2020
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Schouten, T.D. (author), Keetels, G.H. (author), van Rhee, C. (author)In dredging applications, deep sea mining and land reclamation projects typically large amounts of sediments are transported through pipes in the form of hyper concentrated (40% sediment or more) sediment-water mixtures or slurry. These slurries can flow at three different regimes. 1: fully suspended (homogeneous and stratified) 2: partially...conference paper 2019
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Gielen, T.W.J. (author)Abstract not availabledoctoral thesis 2007
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Mihailovic, M. (author)This thesis explores the employment of monocrystalline silicon in microsystems as an active material for different thermal functions, such as heat generation and heat transfer by conduction. In chapter 1 applications that need thermal micro devices, micro heaters and micro heat exchangers, are briefly introduced. The shortcomings of commonly...doctoral thesis 2011