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Sun, Yufeng (author), Pardoen, Benoît (author), van den Eijnden, A.P. (author), Wong, Henry (author)
Clay rocks are multiphase porous media having a complex structure and behaviour characterised by heterogeneity, damage and viscosity, existing on a wide range of scales. The mesoscopic scale of mineral inclusions embedded in a clay matrix has an important role in the mechanisms of deformation under mechanical loading by cracking and creeping....
journal article 2023
document
Schrama, F.N.H. (author), Beunder, Elisabeth M. (author), Panda, Sourav K. (author), Visser, Hessel Jan (author), Moosavi-Khoonsari, Elmira (author), Sietsma, J. (author), Boom, R. (author), Yang, Y. (author)
In hot metal desulphurisation (HMD) the slag will hold the removed sulphur. However, the iron that is lost when the slag is skimmed off, accounts for the highest costs of the HMD process. These iron losses are lower when the slag has a lower viscosity, which can be achieved by changing the slag composition. A lower slag basicity decreases the...
journal article 2021
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Mastromarino, S. (author), Rook, R. (author), de Haas, D.W. (author), Verschuur, D.J. (author), Rohde, M. (author), Kloosterman, J.L. (author)
A method based on ultrasonic wave propagation is applied for the determination of the viscosity of low viscous liquids. A waveguide is used to remotely transmit the ultrasonic waves from a shear piezoelectric transducer into the liquid. At the solid-liquid interface, a guided wave mode, the shear mode, is used to extract the liquid viscosity....
journal article 2021
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Mosleh, Yasmine (author), Mosleh, Y. (author), Beerkens, L.G.M. (author), Poulis, J.A. (author), de la Rie, E. René (author)
Materials, both natural and synthetic, are used as adhesives or consolidants during the conservation of cultural objects. However, few adhesives have been formulated specifically for the needs of cultural heritage. This article describes a study of the stability of ethylene butyl acrylate copolymers as well as blends of these polymers with low...
journal article 2021
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Marynets, K. (author)
We discuss a mathematical model for the equatorial current across the Pacific Ocean, obtained as a leading-order solution to the Navier-Stokes governing equations for geophysical flows in a rotating frame.
journal article 2020
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Struzziero, G. (author), Skordos, A. A. (author)
The present paper addresses the multi-objective optimization of the filling stage of the Resin Infusion manufacturing process. The optimization focuses on the selection of an optimal temperature profile which addresses the tradeoff between filling time and the risk of impeding the flow of resin due to excessive curing. The methodology developed...
journal article 2019
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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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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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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
document
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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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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Ooms, 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
document
Hughes, T.J.R. (author), Wells, G.N. (author), Wray, A.A. (author)
Energy transfers within large-eddy simulation (LES) and direct numerical simulation (DNS) grids are studied. The spectral eddy viscosity for conventional dynamic Smagorinsky and variational multiscale LES methods are compared with DNS results. Both models underestimate the DNS results for a very coarse LES, but the dynamic Smagorinsky model is...
journal article 2004
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Bakker, A.F. (author), Lowe, C.P. (author)
In a suspension, the hydrodynamic interactions between particles can propagate by two mechanisms: relatively slowly, by the diffusion of transverse momentum, or relatively rapidly, by the propagation of sound waves. Here we describe computer simulation results for the collective and single particle dynamics of colloidal particles with the aim of...
journal article 2002
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Verberg, R. (author)
doctoral thesis 1998
document
van der Vooren, J. (author), van der Wees, A.J. (author)
The mathematical background is described of a method that is currently being developed at NLR to calculated wave drag in transonic potential flow. The method is a generalization and extension of Garabedian's and McFadden's idea of determining wave drag by volume-integration of the artificial viscosity. The generalization of Garabedian's and...
report 1990
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