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Roijmans, R.F.H. (author)Optimization of drilling fluid properties is an essential part of cost effective drilling operations and process safety. Currently fluid properties are measured and optimized manually by human engineers with different skills and experience which might lead to nonoptimum drilling fluid properties that deteriorate its functionalities. Automated...master thesis 2016
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- Chahardowli, M. (author) doctoral thesis 2016
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Schuit, T.E. (author)In the oil and gas industry, safety and efficiency are taken into high regard when obtaining new natural resources. An increasing demand for automation arises to meet with the new safety and efficiency standards. During drilling operations, drilling fluid maintenance has an important role in guaranteeing safety on the rig. Controlling the...master thesis 2016
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Meijers, P.C. (author)Turbulence plays an important role in a broad range of engineering applications. In the industry RANS simulations are a common method for predicting turbulent flow. A broad range of RANS turbulence models have been developed over the past decades. For the assessment of complex three-dimensional flow fields Reynolds Stress Transport Models are a...master thesis 2016
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Kapetas, L. (author), Vincent-Bonnieu, S.Y.F. (author), Danelis, S (author), Rossen, W.R. (author), Farajzadeh, R. (author), Eftekhari, A.A. (author), Mohd Shafian, SR (author), Kamarul Bahrim, RZ (author)Foam can increase sweep efficiency within a porous medium, which is useful for oil-recovery processes[1]. The flow of foam in porous media is a complex process that depends on properties like permeability, porosity and surface chemistry, but also temperature. Although the surface activity of surfactants as a function of temperature is well...journal article 2016
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Kraaij, R.C. (author)We prove the large deviation principle (LDP) for the trajectory of a broad class of finite state mean-field interacting Markov jump processes via a general analytic approach based on viscosity solutions. Examples include generalized Ehrenfest models as well as Curie–Weiss spin flip dynamics with singular jump rates. The main step in the proof of...journal article 2016
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Righolt, B.W. (author), Kenjeres, S. (author), Kalter, R. (author), Tummers, M.J. (author), Kleijn, C.R. (author)We demonstrate how the self-sustained oscillation of a confined jet in a thin cavity can be quantitatively described by a zero-dimensional model of the delay differential equation type with two a priori predicted model constants. This model describes the three phases in self-sustained oscillations: (i) pressure driven growth of the oscillation, ...journal article 2015
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Bleeker, N. (author)Clay particles, known for their adhesive properties, are commonly encountered in underwater soils. When producing large quantities of sand by means of dredging, fines are a byproduct and cause important viscosity changing effects altering the sand settling behavior. Much is already known in this field but knowledge lacks in the area where sand...master thesis 2015
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Van den Ende, T.W. (author)Polymer flooding is the most widely used chemical EOR method. Despite being widely used, the apparent shear-thickening behaviour of the polymer solutions in porous flow at high flow rates is poorly understood. One of the supposed mechanisms is the strain-thickening behaviour of polymer solutions. This fluid property will alter the flow dynamics...master thesis 2015
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Van der Wal, W. (author), Whitehouse, P.L. (author), Schrama, E.J.O. (author)Seismic data indicate that there are large viscosity variations in the mantle beneath Antarctica. Consideration of such variations would affect predictions of models of Glacial Isostatic Adjustment (GIA), which are used to correct satellite measurements of ice mass change. However, most GIA models used for that purpose have assumed the mantle to...journal article 2015
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Meulenbroek, B.J. (author), Farajzadeh, R. (author), Bruining, J. (author)Carbon dioxide injected in an aquifer rises quickly to the top of the reservoir and forms a gas cap from where it diffuses into the underlying water layer. Transfer of the CO2 to the aqueous phase below is enhanced due to the high density of the carbon dioxide containing aqueous phase. This paper investigates the behavior of the diffusive...journal article 2013
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Ivins, E.R. (author), James, T.S. (author), Wahr, J. (author), Schrama, E.J.O. (author), Landerer, F.W. (author), Simon, K.M. (author)Antarctic volume changes during the past 21 thousand years are smaller than previously thought, and here we construct an ice sheet history that drives a forward model prediction of the glacial isostatic adjustment (GIA) gravity signal. The new model, in turn, should give predictions that are constrained with recent uplift data. The impact of the...journal article 2013
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Ooms, G. (author), Pourquie, M.J.B.M. (author), Beerens, J.C. (author)A numerical study has been made of horizontal core-annular flow: the flow of a high-viscosity liquid core surrounded by a low-viscosity liquid annular layer through a horizontal pipe. Special attention is paid to the question how the buoyancy force on the core, caused by a density difference between the core and the annular layer, is...journal article 2013
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Geschiere, S.D. (author), Ziemecka, I. (author), Van Steijn, V. (author), Koper, G.J.M. (author), Van Esch, J.H. (author), Kreutzer, M.T. (author)This paper studies the Rayleigh-Plateau instability for co-flowing immiscible aqueous polymer solutions in a microfluidic channel. Careful vibration-free experiments with controlled actuation of the flow allowed direct measurement of the growth rate of this instability. Experiments for the well-known aqueous two phase system (ATPS, or aqueous...journal article 2012
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Markesteijn, A.P. (author), Hartkamp, R. (author), Luding, S. (author), Westerweel, J. (author)The viscosity-temperature relation is determined for the water models SPC/E, TIP4P, TIP4P/Ew, and TIP4P/2005 by considering Poiseuille flow inside a nano-channel using molecular dynamics. The viscosity is determined by fitting the resulting velocity profile (away from the walls) to the continuum solution for a Newtonian fluid and then compared...journal article 2012
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Van Balen, W. (author), Uijttewaal, W.S.J. (author), Blanckaert, K. (author)Large-eddy simulation (LES) is performed of a curved open-channel flow over topography based on the laboratory experiment by Blanckaert [“Topographic steering, flow circulation, velocity redistribution and bed topography in sharp meander bends,” Water Resour. Res., doi:10.1029/2009WR008303 (in press)] . In the experiment, the large-scale bed...journal article 2010
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Schakel, M.D. (author), Smeulders, D. (author)The dispersion relation for seismoelectric wave propagation in poroelastic media is formulated in terms of effective densities comprising all viscous and electrokinetic coupling effects. Using Helmholtz decomposition, two seismoelectric conversion coefficients are derived, for an incident P-wave upon an interface between a compressible fluid and...journal article 2010
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Vafanejad, A. (author)There is a large demand for an online sensor to monitor the quality of lubricating oils. By constant monitoring the engine oil quality, a better understanding of oil condition can be found. The information on oil condition will lead to a much more accurate determination of proper oil change time, while it also provides increased insight into the...master thesis 2009
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Sprakel, J. (author), Van der Gucht, J. (author), Cohen Stuart, M.A. (author), Besseling, N.A.M. (author)We discuss the thermal motion of colloidal particles in transient polymer networks. For particles that are physically bound to the surrounding chains, light-scattering experiments reveal that the submillisecond dynamics changes from diffusive to Rouse-like upon crossing the network formation threshold. Particles that are not bound do not show...journal article 2008
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Core-annular flow through a horizontal pipe: Hydrodynamic counterbalancing of buoyancy force on coreOoms, G. (author), Vuik, C. (author), Poesio, P. (author)A theoretical investigation has been made of core-annular flow: the flow of a high-viscosity liquid core surrounded by a low-viscosity liquid annular layer through a horizontal pipe. Special attention is paid to the question of how the buoyancy force on the core, caused by a density difference between the core and the annular layer, is...journal article 2007