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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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Kidess, A. (author), Kenjeres, S. (author), Kleijn, C.R. (author)With transient LES and DNS simulations, we investigate flow in melt pools driven by thermocapillary forces. The developing pool is at first axisymmetric as are the boundary conditions, but flow instabilities arise that lead to 3D oscillatory flow patterns. At higher laser powers a sign-change in the surface tension temperature coefficient occurs...conference paper 2015
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Musterd, M. (author), Van Steijn, V. (author), Kleijn, C.R. (author), Kreutzer, M.T. (author)We present a theoretical model to calculate the volume of non-wetting bubbles and droplets in segmented microflows from given dimensions of the microchannel and measured lengths of bubbles and droplets. Despite the importance of these volumes in interpreting experiments on reaction kinetics and transport phenomena, an accurate model like the one...journal article 2015
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Musterd, M. (author), Van Steijn, V. (author), Kleijn, C.R. (author), Kreutzer, M.T. (author)Local contact line pinning prevents droplets from rearranging to minimal global energy, and models for droplets without pinning cannot predict their shape. We show that experiments are much better described by a theory, developed herein, that does account for the constrained contact line motion, using as an example droplets on tilted plates. We...journal article 2014
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Kalter, R. (author), Tummers, M.J. (author), Kenjeres, S. (author), Righolt, B.W. (author), Kleijn, C.R. (author)The influence of electromagnetic forcing on self-sustained oscillations of a jet issuing from a submerged nozzle into a thin vertical cavity (width W much larger than thickness T) has been studied using particle image velocimetry. A permanent Lorentz force is produced by applying an electrical current across the width of the cavity in...journal article 2014
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Ambesi, D. (author), Kleijn, C.R. (author), Den Hartog, E.A. (author), Bouma, R.H.B. (author), Brasser, P. (author)In chemical, biological, radiological, and nuclear protective clothing, a layer of activated carbon material in between two textile layers provides protection against hazardous gases. A cylinder in cross flow, sheathed by such material, is generally used to experimentally test the garment properties. This is, however, complicated and predictive...journal article 2013
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Hoang, D.A. (author), Portela, L.M. (author), Kleijn, C.R. (author), Kreutzer, M.T. (author), Van Steijn, V. (author)The breakup of droplets due to creeping motion in a confined microchannel geometry is studied using three-dimensional numerical simulations. Analogously to unconfined droplets, there exist two distinct breakup phases: (i) a quasi-steady droplet deformation driven by the externally applied flow; and (ii) a surface-tension-driven three-dimensional...journal article 2013
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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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Rosso, M. (author), Van Steijn, V. (author), De Smet, L.C.P.M. (author), Sudhölter, E.J.R. (author), Kleijn, C.R. (author), Kreutzer, M.T. (author)A self-similar reaction front develops in reactive ion etching when the ions penetrate channels of shallow height h. This relates to the patterning of microchannels using a single-step etching and bonding, as described by Rhee et al. [Lab Chip 5, 102 (2005)] . Experimentally, we report that the front location scales as xf ? ht1/2 and the width...journal article 2011
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Cohen Stuart, D.C. (author), Kleijn, C.R. (author), Kenjeres, S. (author)In this paper we report on a newly developed particle tracking scheme for fluid flow simulations on 3D unstructured grids, aiming to provide detailed insights in the particle behaviour in complex geometries. A possible field of applications is the Magnetic Drug Targeting (MDT) technique, on which this paper will be focused. MDT is a promising...journal article 2010
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Van Steijn, V. (author), Kleijn, C.R. (author), Kreutzer, M.T. (author)We describe the breakup of a confined gas thread in a cross-flowing stream of liquid at capillary numbers Ca<10-2. The breakup is initiated, not by a Plateau-Rayleigh instability, but by liquid that flows from the tip of the thread to the neck where pinch-off occurs. This flow, faster than previously estimated, is driven by different curvatures...journal article 2009
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- Liang, Y. (author), Kleijn, S. (author), Mooij, L. (author), Van de Krol, R. (author) journal article 2009
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Haverkort, J.W. (author), Kenjeres, S. (author), Kleijn, C.R. (author)The aim of Magnetic Drug Targeting (MDT) is to concentrate drugs, attached to magnetic particles, in a specific part of the human body by applying a magnetic field. Computational simulations are performed of blood flow and magnetic particle motion in a left coronary artery and a carotid artery, using the properties of presently available...journal article 2009
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Haverkort, J.W. (author), Kenjeres, S. (author), Kleijn, C.R. (author)The manipulation of magnetic particles in a continuous flow with magnetic fields is central to several biomedical applications, including magnetic cell separation and magnetic drug targeting. A simplified twodimensional (2D) equation describing the motion of particles in a planar Poiseuille flow is considered for various magnetic field...journal article 2009
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Kenjeres, S. (author), Verdoold, J. (author), Tummers, M.J. (author), Hanjalic, K. (author), Kleijn, C.R. (author)The paper reports on numerical and experimental investigations of electromagnetically driven vortical flows of an electrically conductive fluid in a generic setup. Two different configurations of permanent magnets are considered: a 3-magnet configuration in which the resulting Lorentz force is focused in the wall-boundary layers, and a 2-magnet...journal article 2009
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Sobera, M.P. (author), Kleijn, C.R. (author)We study flow and heat transfer to a cylinder in cross flow at Re = 3,900–80,000 by means of three-dimensional transient RANS (T-RANS) simulations, employing an RNG k???? turbulence model. Both the case of a bare solid cylinder and that of a solid cylinder surrounded at some fixed distance by a thin porous layer have been studied. The latter...journal article 2008
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Abbate, G. (author), Kleijn, C.R. (author), Thijsse, B.J. (author), Engeln, R. (author), Van de Sanden, M.C.M. (author), Schram, D.C. (author)The gas dynamics of a stationary hot-gas jet supersonically expanding into a low pressure environment is studied through numerical simulations. A hybrid coupled continuum-molecular approach is used to model the flow field. Due to the low pressure and high thermodynamic gradients, continuum mechanics results are doubtful, while, because of its...journal article 2008
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Kleijn, R.J. (author)The 13C-labeling technique is a powerful characterization tool within the field of metabolic engineering aimed at determining intracellular steady state fluxes. The provided metabolic snapshots enable researchers to better understand and predict the phenotypic behavior of a micro-organism as a result of genetic alterations and/or different...doctoral thesis 2007
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Sobera, M.P. (author), Kleijn, C.R. (author)The hydraulic permeability of single-layer fibrous media is studied through two-dimensional (2D) and three-dimensional Navier-Stokes based flow simulations. As simple representations of such materials, one-dimensional arrays of parallel cylinders as well as two-dimensional arrays of perpendicularly crossing cylinders were used. The distance...journal article 2006
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- Kleijn, C.R. (author) journal article 2006
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