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Breugem, A.J. (author), Gerritsma, L.J. (author), Krul, R.A. (author), Over, M.J.J. (author)Document(en) uit de collectie Chemische Procestechnologiereport 2001
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Lambert, R.A. (author), Picano, F. (author), Breugem, W.P. (author), Brandt, L. (author)A numerical study of swimming particle motion and nutrient transport is conducted for a semidilute to dense suspension in a thin film. The steady squirmer model is used to represent the motion of living cells in suspension with the nutrient uptake by swimming particles modelled using a first-order kinetic equation representing the absorption...journal article 2013
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Breugem, W.P. (author), Boersma, B.J. (author)A direct numerical simulation (DNS) has been performed of turbulent channel flow over a three-dimensional Cartesian grid of 30×20×9 cubes in, respectively, the streamwise, spanwise, and wall-normal direction. The grid of cubes mimics a permeable wall with a porosity of 0.875. The flow field is resolved with 600×400×400 mesh points. To enforce...journal article 2005
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Lashgari, I. (author), Picano, F. (author), Breugem, W.P. (author), Brandt, L. (author)We study the transition from laminar to turbulent flow in a channel seeded with finite-size neutrally buoyant particles. A fixed ratio of 10 between the channel height and the particle diameter is considered. The flow is examined in the range of Reynolds numbers 500 ? Re ? 5000 and the particle volume fractions 0.001 ? ? ? 0.3. We report a non...journal article 2015
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Lashgari, I. (author), Picano, F. (author), Breugem, W.P. (author), Brandt, L. (author)The aim of this Letter is to characterize the flow regimes of suspensions of finite-size rigid particles in a viscous fluid at finite inertia. We explore the system behavior as a function of the particle volume fraction and the Reynolds number (the ratio of flow and particle inertia to viscous forces). Unlike single-phase flows, where a clear...journal article 2014
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Costa, P. (author), Boersma, B.J. (author), Westerweel, J. (author), Breugem, W.P. (author)We present a collision model for particle-particle and particle-wall interactions in interface-resolved simulations of particle-laden flows. Three types of interparticle interactions are taken into account: (1) long- and (2) short-range hydrodynamic interactions, and (3) solid-solid contact. Long-range interactions are incorporated through an...journal article 2015
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Picano, F. (author), Breugem, W.P. (author), Mitra, D. (author), Brandt, L. (author)Shear thickening appears as an increase of the viscosity of a dense suspension with the shear rate, sometimes sudden and violent at high volume fraction. Its origin for noncolloidal suspension with non-negligible inertial effects is still debated. Here we consider a simple shear flow and demonstrate that fluid inertia causes a strong...journal article 2013
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Boersma, B.J. (author), Breugem, W.P. (author)In this paper we consider a fully developed turbulent flow in a round pipe with a small inner annulus. The diameter of the inner annulus is less than 10% of the diameter of the outer pipe. As a consequence, the surface area of the inner pipe compared to the outer pipe is small. The friction exerted by the wall on the flow is proportional to the...journal article 2010
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Hussong, J. (author), Breugem, W.P. (author), Westerweel, J. (author)In this numerical study we investigate the flow induced by metachronal coordination between beating cilia arranged in a densely packed layer by means of a continuum model. The continuum approach allows us to treat the problem as two-dimensional as well as stationary, in a reference frame moving with the speed of the metachronal wave. The model...journal article 2011
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- Breugem, W.P. (author), Boersma, B.J. (author), Uittenbogaard, R.E. (author) journal article 2006
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Brändle de Motta, J.C. (author), Breugem, W.P. (author), Gazanion, B. (author), Estivalezes, J.L. (author), Vincent, S. (author), Climent, E. (author)A general model is presented for short-range hydrodynamic interactions and head-on particle-particle/wall collisions. The model has been embedded in two distinct numerical methods for fully resolved simulation of finite-size particles in a viscous fluid. It accounts for the material properties of the particles and lubrication effects prior to...journal article 2013
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Van Overveld, T. J.J.M. (author), Shajahan, M.T. (author), Breugem, W.P. (author), Clercx, H. J.H. (author), Duran-Matute, M. (author)When two spherical particles submerged in a viscous fluid are subjected to an oscillatory flow, they align themselves perpendicular to the direction of the flow leaving a small gap between them. The formation of this compact structure is attributed to a nonzero residual flow known as steady streaming. We have performed direct numerical...journal article 2022
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Kramer, O.J.I. (author), van Schaik, C. (author), Hangelbroek, J.J. (author), de Moel, P.J. (author), Colin, M.G. (author), Amsing, M. (author), Boek, E.S. (author), Breugem, W.P. (author), Padding, J.T. (author), van der Hoek, J.P. (author)Liquid-solid fluidisation is frequently encountered in drinking water treatment processes, often to obtain a large liquid-solid interfacial surface area. A large surface area is crucial for optimal seeded crystallisation in full-scale softening reactors. Due to crystallisation, particles grow and migrate to a lower zone in the reactor which...journal article 2021
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Kramer, O.J.I. (author), de Moel, Peter J. (author), Kaveripuram Ramasamy, S.R. (author), Baars, Eric T. (author), van Vught, Wim H. (author), Breugem, W.P. (author), Padding, J.T. (author), van der Hoek, J.P. (author)Natural particles are frequently applied in drinking water treatment processes in fixed bed reactors, fluidised bed reactors, and sedimentation processes to clarify water and to concentrate solids. When particles settle, it has been found that, in terms of hydraulics, natural particles behave differently when compared to perfectly round spheres....journal article 2021
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Goudar Vishwanathappa, M. (author), Breugem, W.P. (author), Elsinga, G.E. (author)For channel flow, we explore how commonly found weak eddies can still auto-generate and produce new eddies. Before, only strong eddies (above a threshold strength) were considered to auto-generate. Such strong eddies are rarely observed in actual turbulent flows however. Here, the evolution of two weak conditional eddies with different initial...journal article 2016
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Kamis, Y.E. (author), Prakash, Suriya (author), Breugem, W.P. (author), Eral, H.B. (author)We experimentally and numerically study the dynamics of a liquid jet issued from a rotating orifice, whose breakup is regulated by a vibrating piezo element. The helical trajectory of the spiralling jet yields fictitious forces varying along the jet whose longitudinal projections stretch and thin the jet, affecting the growth of perturbations....journal article 2023
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Kamis, Y.E. (author), Eral, H.B. (author), Breugem, W.P. (author)Using a slender-jet approach, we numerically investigate the control of jet breakup using temperature modulation at the nozzle with a specified frequency and amplitude. Our results show that temperature modulation does lead to instability through capillary and Marangoni stresses, providing control of the droplet formation in terms of intact...journal article 2021
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Kaveripuram Ramasamy, S.R. (author), Poelma, C. (author), Breugem, W.P. (author)Path instabilities of a sphere rising or falling in a quiescent Newtonian fluid have been studied experimentally. The rich palette of possible instabilities is dependent upon two dimensionless quantities, namely the Galileo number (Ga) and the particle/fluid mass density ratio (ρ¯). In recent literature, several (Ga,ρ¯) regime maps have been...journal article 2022
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Peerbooms, W. (author), Nadorp, Tim (author), van der Heijden, A.E.D.M. (author), Breugem, W.P. (author)In the literature, two different frameworks exist for describing the rheology of solid/liquid suspensions: (1) the “viscous” framework in terms of the relative suspension viscosity, η<sub>r</sub>, as a function of the reduced solid volume fraction, f=f<sub>m</sub>, with f<sub>m</sub> the maximum flowable packing fraction, and (2) the ...journal article 2024
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Hogendoorn, W.J. (author), Breugem, W.P. (author), Frank, David (author), Bruschewski, Martin (author), Grundmann, Sven (author), Poelma, C. (author)Magnetic resonance imaging (MRI) experiments have been performed in conjunction with direct numerical simulations (DNS) to study neutrally buoyant particle-laden pipe flows. The flows are characterized by the suspension liquid Reynolds number (Res), based on the bulk liquid velocity and suspension viscosity obtained from Eilers' correlation,...journal article 2023