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Simulation of vertical core-annular flow with a turbulent annulus

Li, H. (author), Pourquie, M.J.B.M. (author), Ooms, G. (author), Henkes, R.A.W.M. (author)

The Reynolds-Averaged Navier Stokes (RANS) with the Launder & Sharma low-Reynolds number k−ε model was used to simulate core-annular flow in the same configuration with vertical upflow as considered by Kim & Choi (2018), who carried out Direct Numerical Simulations (DNS), and by Vanegas Prada (1999), who performed experiments. The DNS...

journal article 2023

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Simulation of a turbulent annulus with interfacial waves in core-annular pipe flow

Li, H. (author), Pourquie, M.J.B.M. (author), Ooms, G. (author), Henkes, R.A.W.M. (author)

Interfacial waves in core-annular pipe flow are studied through two-phase numerical simulations. Here the water annulus is turbulent, whereas the oil core stays laminar. The low-Reynolds number Launder & Sharma k−ε model is applied. By extracting the moving wave shape from the two-phase results and imposing this as a solid boundary in a...

journal article 2022

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Three-dimensional numerical study of the combined stroke swimmer

Ooms, G. (author), Pourquie, M.J.B.M. (author), Tam, D.S.W. (author)

A three-dimensional (3D) numerical simulation was performed using a combined stroke swimmer (deformable sphere) in an incompressible fluid of an infinite domain. The time-dependent deformation of the swimmer surface was assumed independent of the circumferential cross section in the flow direction of the swimmer. The 3D numerical simulation...

journal article 2022

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Simulation of turbulent horizontal oil-water core-annular flow with a low-Reynolds number k–ɛ model

Li, H. (author), Pourquie, M.J.B.M. (author), Ooms, G. (author), Henkes, R.A.W.M. (author)

1D, 2D and 3D numerical simulations were carried out with the Reynolds-Averaged Navier-Stokes equations (RANS) for horizontal oil-water core-annular flow in which the oil core stays laminar while the water layer is turbulent. The turbulence is described with the Launder-Sharma low-Reynolds number k−ϵ model. The simulation results are compared...

journal article 2021

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Simulation of the hydrodynamics in the onset of fouling for oil-water core-annular flow in a horizontal pipe

Jiang, J. (author), Li, H. (author), Pourquie, M.J.B.M. (author), Ooms, G. (author), Henkes, R.A.W.M. (author)

Core-annular flow is an efficient way of transporting viscous oil through a pipeline. A sharp increase in the pressure drop will occur when the oil waves at the water-oil interface touch the pipe wall. Depending on the oil and pipe material physical properties, the oil may adhere to the wall leading to fouling. Therefore, a necessary...

journal article 2021

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Influence of oil viscosity on oil-water core-annular flow through a horizontal pipe

van Duin, Erik (author), Henkes, R.A.W.M. (author), Ooms, G. (author)

An experimental study has been made of oil-water core-annular flow in a horizontal pipe with special attention for the influence of the oil viscosity on the pressure drop. For that purpose a heating system has been installed and configured that is able to control the oil temperature, such that the oil viscosity could be varied between 3000 cSt...

journal article 2018

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A comparison between numerical predictions and experimental results for horizontal core-annular flow with a turbulent annulus

Ingen Housz, E.M.R.M. (author), Ooms, G. (author), Henkes, R.A.W.M. (author), Pourquie, M.J.B.M. (author), Kidess, A. (author), Radhakrishnan, R. (author)

An experimental and numerical study has been made of oil-water core-annular flow in a horizontal pipe with special attention for the turbulence in the water. An experimental set-up was built to be able to compare numerical predictions with detailed experimental results. The oil density was considerably smaller than the water density. Full 3D and...

journal article 2017

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Interfaces and internal layers in a turbulent boundary layer

Eisma, H.E. (author), Westerweel, J. (author), Ooms, G. (author), Elsinga, G.E. (author)

New experimental research is presented on the characteristics of interfaces and internal shear layers that are present in a turbulent boundary layer (TBL). The turbulent/non-turbulent (T/NT) interface at the outer boundary of the TBL shows the presence of a finite jump in streamwise velocity and is characterised by a thin shear layer. It appears...

journal article 2015

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A comparison between numerical predictions and theoretical and experimental results for laminar core-annular flow

Beerens, J.C. (author), Ooms, G. (author), Pourquie, M.J.B.M. (author), Westerweel, J. (author)

high-viscosity liquid core surrounded by a laminar low-viscosity liquid annular layer through a vertical pipe. The numerical results are compared with theoretical results from linear stability calculations and with experimental data. The comparison is good and the general conclusion of our study is that it is very well possible to simulate...

journal article 2014

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On the levitation force in horizontal core-annular flow with a large viscosity ratio and small density ratio

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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Particle Entrainment in Spherical-Cap Wakes

Warncke, N.G.W. (author), Delfos, R. (author), Ooms, G. (author), Westerweel, J. (author)

In this work we study the preferential concentration of small particles in the turbulent wake behind a spherical-cap object. We present a model predicting the mean particle concentration in the near-wake as a function of the characteristic Stokes number of the problem, the turbulence level and the Froude number. We compare the model with our...

conference paper 2011

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Flow of a viscous compressible fluid produced in a circular tube by an impulsive point source

Felderhof, B.U. (author), Ooms, G. (author)

The flow of a viscous compressible fluid in a circular tube generated by a sudden impulse at a point on the axis is studied on the basis of the linearized Navier–Stokes equations. A no-slip boundary condition is assumed to hold on the wall of the tube. An efficient numerical scheme has been developed for the calculation of flow velocity and...

journal article 2011

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Direct numerical simulation analysis of local flow topology in a particle-laden turbulent channel flow

Bijlard, M.J. (author), Oliemans, R.V.A. (author), Portela, L.M. (author), Ooms, G. (author)

The results of point-particle Eulerian–Lagrangian direct numerical simulation (DNS) calculations of dilute particle-laden turbulent channel flow are used to study the effect of the particles on the local flow topology. It is found that in the viscous sublayer, the flow becomes increasingly more two-dimensional as the two-way coupling effect (due...

journal article 2010

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Phenomenological description of phase inversion

Piela, K. (author), Ooms, G. (author), Sengers, J.V. (author)

We propose an extended Ginzburg-Landau model for a description of the ambivalence region associated with the phenomenon of phase inversion observed in dispersed water-oil flow through a pipe. In analogy to the classical mean-field theory of phase transitions, it is shown that a good quantitative representation of the ambivalence region is...

journal article 2009

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The development of truncated inviscid turbulence and the Fermi–Pasta–Ulam problem

Ooms, G. (author), Boersma, B.J. (author)

A study was made of the possible similarity between the development of truncated, inviscid turbulence and the Fermi–Pasta–Ulam (FPU) problem. For the case of a constant time scale, which resembles the FPU problem, a significant increase in the time to achieve equipartition was found when the initial energy was decreased. At first a few modes...

journal article 2008

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Air–water flow in a vertical pipe: Experimental study of air bubbles in the vicinity of the wall

Descamps, M.N. (author), Oliemans, R.V.A. (author), Ooms, G. (author), Mudde, R.F. (author)

This study deals with the influence of bubbles on a vertical air–water pipe flow, for gas-lift applications. The effect of changing the bubble size is of particular interest as it has been shown to affect the pressure drop over the pipe. Local measurements on the bubbles characteristics in the wall region were performed, using standard...

journal article 2008

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Particle–fluid interactions in grid-generated turbulence

Poelma, C. (author), Westerweel, J. (author), Ooms, G. (author)

The effect of small particles on decaying grid-generated turbulence is studied experimentally. Using a two-camera system, instantaneous fluid-phase and particlephase measurements can be obtained simultaneously. The data obtained with this system are used to study the decay behaviour of the turbulent flow. The role of particle size, particle...

journal article 2007

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Core-annular flow through a horizontal pipe: Hydrodynamic counterbalancing of buoyancy force on core

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

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Experimental evidence of ultrasonic stimulation of brine-oil flow through a porous rock in laboratory conditions

Tu, X. (author), Ooms, G. (author), Van Der Bas, F. (author)

journal article 2007

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Removal of particle bridges from a porous material by ultrasonic irradiation

Poesio, P. (author), Ooms, G. (author)

journal article 2007