Computational fluid dynamics applied to gas-liquid contactors

Delnoij, E; Kuipers, J.A.M.; Swaaij, van Wpm Wim

doi:10.1016/s0009-2509(97)00268-6

Cited by 146 publications

(82 citation statements)

References 30 publications

(29 reference statements)

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“…The results compare favorably with the numerical predictions of Delnoij et al (1998) who found a qualitative agreement with available experimental data.…”

Section: Merger Of Two Bubblessupporting

confidence: 81%

Finite-element/level-set/operator-splitting (FELSOS) approach for computing two-fluid unsteady flows with free moving interfaces

Smolianski

2005

Int. J. Numer. Meth. Fluids

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The present work is devoted to the study on unsteady flows of two immiscible viscous fluids separated by free moving interface. Our goal is to elaborate a unified strategy for numerical modeling of twofluid interfacial flows, having in mind possible interface topology changes (like merger or break-up) and realistically wide ranges for physical parameters of the problem. The proposed computational approach essentially relies on three basic components: the finite element method for spatial approximation, the operator-splitting for temporal discretization and the level-set method for interface representation. We show that the finite element implementation of the level-set approach brings some additional benefits as compared to the standard, finite difference level-set realizations. In particular, the use of finite elements permits to localize the interface precisely, without introducing any artificial parameters like the interface thickness; it also allows to maintain the second-order accuracy of the interface normal, curvature and mass conservation. The operator-splitting makes it possible to separate all major difficulties of the problem and enables us to implement the equal-order interpolation for the velocity and pressure. Diverse numerical examples including simulations of bubble dynamics, bifurcating jet flow and Rayleigh-Taylor instability are presented to validate the computational method.

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“…The results compare favorably with the numerical predictions of Delnoij et al (1998) who found a qualitative agreement with available experimental data.…”

Section: Merger Of Two Bubblessupporting

confidence: 81%

Finite-element/level-set/operator-splitting (FELSOS) approach for computing two-fluid unsteady flows with free moving interfaces

Smolianski

2005

Int. J. Numer. Meth. Fluids

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“…The former treats the droplets as an effective continuum and is in essence a generalized two-fluid model (Ishii 1975;Bennon & Incropera 1987). The latter recognizes the necessity of tracking discrete droplets, and achieves this by using correlations, say, for the drag and lift coefficients (Delnoij, Kuipers & van Swaaij 1997). In both models, the mass, momentum and heat transfer between the gas and the droplets must be provided as inputs; these may come from experimental data, phenomenological calculations using, say, the cell model (Bellan 1991), or accurate calculations for a single droplet (Sirignano 1999).…”

Section: Introductionmentioning

confidence: 99%

Direct numerical simulation of the sedimentation of solid particles with thermal convection

et al. 2003

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Dispersed two-phase flows often involve interfacial activities such as chemical reaction and phase change, which couple the fluid dynamics with heat and mass transfer. As a step toward understanding such problems, we numerically simulate the sedimentation of solid bodies in a Newtonian fluid with convection heat transfer. The two-dimensional Navier-Stokes and energy equations are solved at moderate Reynolds numbers by a finite-element method, and the motion of solid particles is tracked using an arbitrary Lagrangian-Eulerian scheme. Results show that thermal convection may fundamentally change the way that particles move and interact. For a single particle settling in a channel, various Grashof-number regimes are identified, where the particle may settle straight down or migrate toward a wall or oscillate laterally. A pair of particles tend to separate if they are colder than the fluid and aggregate if they are hotter. These effects are analysed in terms of the competition between the thermal convection and the external flow relative to the particle. The mechanisms thus revealed have interesting implications for the formation of microstructures in interfacially active two-phase flows. Dispersed two-phase flows often involve interfacial activities such as chemical reaction and phase change, which couple the fluid dynamics with heat and mass transfer. As a step toward understanding such problems, we numerically simulate the sedimentation of solid bodies in a Newtonian fluid with convection heat transfer. The twodimensional Navier-Stokes and energy equations are solved at moderate Reynolds numbers by a finite-element method, and the motion of solid particles is tracked using an arbitrary Lagrangian-Eulerian scheme. Results show that thermal convection may fundamentally change the way that particles move and interact. For a single particle settling in a channel, various Grashof-number regimes are identified, where the particle may settle straight down or migrate toward a wall or oscillate laterally. A pair of particles tend to separate if they are colder than the fluid and aggregate if they are hotter. These effects are analysed in terms of the competition between the thermal convection and the external flow relative to the particle. The mechanisms thus revealed have interesting implications for the formation of microstructures in interfacially active two-phase flows. Disciplines Engineering | Mechanical Engineering

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“…In the volume of fluid (VOF) formulation, [16], for multiphase fluid dynamics the fluids are not interpenetrating. For each phase, a variable is introduced: the volume fraction of the phase in the computational cell.…”

Section: Mathematical Model and Geometrymentioning

confidence: 99%

“…The pressure velocity coupling is obtained using the SIMPLEC algorithm. We use the geometrical reconstruction scheme to obtain the faces fluxes, when the cell is near the interface between two phases; this scheme represents the interface between fluids using a piecewise-linear approach [16]. For the time-dependent VOF calculations, we use a second order implicit time-marching scheme with a convergence criteria of 0.001 and with a time step Δ = 1 × 10 −4 s. The algorithm used for pressure discretization was PRESTO, and for the momentum, turbulent kinetic energy and its dissipation rate equations second order upwind scheme were used [17].…”

Section: Numerical Setupmentioning

confidence: 99%

Fluid Dynamics in a Teniente Type Copper Converter Model with One and Two Tuyeres

Valencia

Rosales-Vera²,

Orellana

2013

Advances in Mechanical Engineering

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We have numerically studied the fluid dynamics in a model of Teniente type copper converter with combined lateral and bottom gas injection. The three-dimensional simulation of the two-phase system was carried out using the volume of fluid (VOF) and the standard k-turbulence models implemented in the commercial solver Fluent. The numerical investigation was carried out in a 1 : 5 scaled water slice model for three different gas injection Froude numbers of the bottom tuyere (0, 36, and 64). The submerged gas injection produces a turbulent jet and provides efficient mixing of the gas and liquid phases. The gas injection through a bottom tuyere increases the fluid mixing, and for Froude number of Fr = 64 interactions between the two gas jets were found.

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Computational fluid dynamics applied to gas-liquid contactors

Cited by 146 publications

References 30 publications

Finite-element/level-set/operator-splitting (FELSOS) approach for computing two-fluid unsteady flows with free moving interfaces

Finite-element/level-set/operator-splitting (FELSOS) approach for computing two-fluid unsteady flows with free moving interfaces

Direct numerical simulation of the sedimentation of solid particles with thermal convection

Fluid Dynamics in a Teniente Type Copper Converter Model with One and Two Tuyeres

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