Separation performance predictions of a Stairmand high‐efficiency cyclone

Derksen, J. J.

doi:10.1002/aic.690490603

Cited by 127 publications

(68 citation statements)

References 20 publications

(10 reference statements)

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“…The research presented in this article originates from earlier work comprising LES of the flow in a reverse-flow cyclone for separating solid particles from a gas stream [6,7]. The motivation to use LES for cyclonic flows is twofold.…”

Section: Introductionsupporting

confidence: 43%

“…Especially in the case of heavy particles in a gas stream, the resolved time-scales of the flow field can be made comparable to the relaxation time of the particles. This way, the fluctuations that are influential to particle motion are fully resolved, and particle trajectory calculations do not need further modeling [7]. In the second place, swirling flows often exhibit coherent, quasi-periodic fluctuations (e.g.…”

Section: Introductioncontrasting

confidence: 39%

“…This laminar profile will not match physical reality, especially for the Re = 4800 case. However, in the virulent region where the inlet flow merges with the swirling fluid already present in the body of the swirl tube, the fluid quickly forgets the conditions in the inflow channel (see also [7]). This was confirmed by tests with a uniform inlet velocity profile: no differences in terms of the average velocity field in the swirl tube with simulations using parabolic inlet profiles could be observed.…”

Section: Flow Systemmentioning

confidence: 44%

“…[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: 48%

“…In the second place, swirling flows often exhibit coherent, quasi-periodic fluctuations (e.g. the precessing vortex core, PVC [1,[6][7][8][9]) that cannot be clearly separated from turbulent fluctuations in the frequency domain. The absence of a spectral gap between coherent and turbulent fluctuations makes LES a favorable approach compared to transient RANS.…”

Section: Introductionmentioning

confidence: 46%

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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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Section: Introductionsupporting

confidence: 43%

Section: Introductioncontrasting

confidence: 39%

Section: Flow Systemmentioning

confidence: 44%

“…[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: 48%

Section: Introductionmentioning

confidence: 46%

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Simulations of confined turbulent vortex flow

Derksen

2005

Computers & Fluids

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Numerical modeling of highly swirling flows in a through‐flow cylindrical hydrocyclone

Zahrai

Macchion

et al. 2006

AIChE Journal

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Two‐way coupled large‐eddy simulations of the gas‐solid flow in cyclone separators

2008

Self Cite

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in Wiley InterScience (www.interscience.wiley.com).Three-dimensional (3-D), time-dependent Eulerian-Lagrangian simulations of the turbulent gas-solid flow in cyclone separators have been performed. The gas flow is simulated with the lattice-Boltzmann method. It solves the filtered Navier-Stokes equations, where the Smagorinsky subgrid-scale model has been used to represent the effect of the filtered scales. Through this large-eddy representation of the gas flow, solid particles with different sizes are tracked. By viewing the individual particles (of which there are some 10 7 inside the cyclone at any moment in time) as clusters of particles (parcels), the effect of particle-to-gas coupling on the gas-flow and particle behavior at modest mass-loadings (up to 0.2 kg dust per kg air) is studied. The numerical approach is able to capture the effect of mass loading on the swirl intensity as reported in the experimental literature. The performance of a Stairmand high-efficiency cyclone under various loading conditions is systematically studied. The presence of solid particles causes the cyclone to lose swirl intensity. Furthermore, the turbulence of the gas flow gets strongly damped. These two effects have significant consequences for the performance of the cyclone. The pressure drop monotonically decreases with mass loading. The collection efficiency responds in a more complicated manner to the mass loading, with mostly increased cut sizes, and increased overall efficiencies.

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Separation performance predictions of a Stairmand high‐efficiency cyclone

Cited by 127 publications

References 20 publications

Simulations of confined turbulent vortex flow

Simulations of confined turbulent vortex flow

Numerical modeling of highly swirling flows in a through‐flow cylindrical hydrocyclone

Two‐way coupled large‐eddy simulations of the gas‐solid flow in cyclone separators

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