Large eddy simulations on the flow driven by a Rushton turbine

Derksen, J. J.; Akker, H.E.A. van den

doi:10.1002/aic.690450202

Cited by 322 publications

(232 citation statements)

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“…[6,7,22,26,27]). Derksen and Van den Akker [22] and Ten Cate et al [27] performed a detailed assessment of the method by comparing its results to experimental data (LDA, PIV).…”

Section: Simulation Proceduresmentioning

confidence: 99%

“…[6,7,22,26,27]). Derksen and Van den Akker [22] and Ten Cate et al [27] performed a detailed assessment of the method by comparing its results to experimental data (LDA, PIV). They achieved good results for noslip boundary conditions at the surface of an impeller rotating in a mixing tank (operated under turbulent conditions), and at the surface of a solid sphere sedimenting in a closed box respectively.…”

Section: Simulation Proceduresmentioning

confidence: 99%

“…To represent curved, no-slip walls in the uniform, cubic lattice, a forcing technique has been developed [22], based on a similar technique developed by Goldstein et al in the framework of spectral methods [23], and by Balaras [24], and Verzicco et al [25] for finite volume schemes (the latter authors call it the immersed boundary technique). In our forcing technique, the wall surface is represented by a large set of control points r j with a nearest neighbor distance slightly less than the lattice spacing.…”

Section: Simulation Proceduresmentioning

confidence: 99%

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Simulations of confined turbulent vortex flow

Derksen

2005

Computers & Fluids

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Large-eddy simulations (LES) of the turbulent flow in a swirl tube with a tangential inlet have been performed. The geometry, and flow conditions were chosen according to an experimental study by [Escudier MP, Bornstein J, Zehnder N. Observations and LDA measurements of confined turbulent vortex flow. J Fluid Mech 1980;98:49-63]. Lattice-Boltzmann discretization was used to numerically solve the Navier-Stokes equations in the incompressible limit. Effects of spatial resolution and choices in subgridscale modeling were explicitly investigated with the experimental data set as the testing ground. Experimentally observed flow features, such as vortex breakdown and laminarization of the vortex core were well represented by the LES. The simulations confirmed the experimental observations that the average velocity profiles in the entire vortex tube are extremely sensitivity to the exit pipe diameter. For the narrowest exit pipe considered in the simulations, very high average velocity gradients are encountered. In this situation, the LES shows the most pronounced effects of spatial resolution and subgrid-scale modeling.

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“…[6,7,22,26,27]). Derksen and Van den Akker [22] and Ten Cate et al [27] performed a detailed assessment of the method by comparing its results to experimental data (LDA, PIV).…”

Section: Simulation Proceduresmentioning

confidence: 99%

Section: Simulation Proceduresmentioning

confidence: 99%

Section: Simulation Proceduresmentioning

confidence: 99%

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Simulations of confined turbulent vortex flow

Derksen

2005

Computers & Fluids

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“…Our method is based on the work of Eggels and Somers (1995); it is described in detail by Ten Cate (2002). The boundary condition at the surface of a particle is taken into account by means of an induced force-field method, similar to the one used by Derksen and Van den Akker (1999). In this method a particle is represented by a number of points located in its surface.…”

Section: Numerical Techniquementioning

confidence: 99%

Removal of Particle Bridges From a Porous Material by Ultrasonic Irradiation

Poesio

Ooms

2007

Transp Porous Med

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Abstract. Particle bridge formation during the flow of a liquid with particles through a porous material is a fouling mechanism that can block the pores and, hence, decrease the permeability of the material. Ultrasonic irradiation of the material is a cleaning method that can restore the permeability. We make a numerical study of this cleaning method using the lattice-Boltzmann method. We start from a pore blocked by two spherical particles attached to the pore wall by colloidal adhesion forces, thus forming a particle bridge. Next we calculate the hydrodynamic force exerted by a high-frequency acoustic wave on the two particles. By comparing the hydrodynamic force and the adhesion force we investigate, whether the particle bridge will be removed by the ultrasonic irradiation. A sensitivity study is carried out to investigate the influence of some relevant parameters, such as the acoustic wave amplitude, the acoustic frequency, the fluid flow velocity and the ratio of particle diameter and pore diameter. An upscaling procedure is applied to translate the microscopic results for the removal of the particles at the pore level to the permeability improvement of the material at the macroscopic level. A comparison is made between numerical results and experimental data. The agreement is reasonable.

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“…To be submitted to AIChE J. [2] Derksen JJ, Van den Akker HEA. Large eddy simulations on the flow driven by a Rushton turbine.…”

mentioning

confidence: 99%

Novel Modeling Technique for Simulations of Turbulent Bubbly Flows with Coalescence and Breakup

Sungkorn¹,

Derksen

Khinast³

2010

Sci. Pharm.

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Flows encountered in processes involving turbulent bubbly flow are highly complex, especially when the gas holdup and gas-liquid interface mobility are such that coalescence and breakup of bubbles take place. These phenomena have an enormous impact on the performance and productivity of the processes. Attempts have been made by researchers to gain insight in the hydrodynamics of bubbly flows by detailed numerical simulation. However, resolving coalescence and breakup has often been ignored due to their large computational requirements. The goal of this presentation is to assess the feasibility of using computational fluid dynamics (CFD) modeling as an engineering tool for analyzing, designing and scale-up of processes involving bubbly flow with coalescence and breakup of bubbles. The parallel and highly efficient modeling technique for bubbly flows described in the work of Sungkorn et al. [1] was extended to incorporate coalescence and breakup phenomena. The continuous liquid phase is simulated using the lattice Boltzmann (LB) scheme originally developed by Derksen and Van den Akker [2]. The trajectory of the individual bubbles is tracked by solving their equations of motion including the effect of the fluid fluctuation along the bubble trajectory. Bubble-bubble collisions as well as coalescences are described based on the stochastic inter-particle collision model according to kinetic theory. The breakup of bubbles is considered using a model based on the local size of turbulent eddies. Simulations of gas-liquid flow in a bubble column have been performed. The simulations provide detailed insight for the liquid flow field as well as the gas dispersion pattern. The accuracy of the simulations is demonstrated by comparing the predictions with experimental data. Additionally, excellent speedup and scalability on parallel computing platforms demonstrate the capability of the present modeling technique for simulations of large-scale reactors.[1]Sungkorn R, Derksen JJ, Khinast JG. Modeling of turbulent gas-liquid bubbly flows. To be submitted to AIChE J. [2] Derksen JJ, Van den Akker HEA. Large eddy simulations on the flow driven by a Rushton turbine.

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Large eddy simulations on the flow driven by a Rushton turbine

Cited by 322 publications

References 20 publications

Simulations of confined turbulent vortex flow

Simulations of confined turbulent vortex flow

Removal of Particle Bridges From a Porous Material by Ultrasonic Irradiation

Novel Modeling Technique for Simulations of Turbulent Bubbly Flows with Coalescence and Breakup

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