Investigation of the flow pattern in different dust outlet geometries of a gas cyclone by laser Doppler anemometry

Obermair, Stefan; Woisetschläger, Jakob; Staudinger, Gernot

doi:10.1016/j.powtec.2003.09.009

Cited by 89 publications

(63 citation statements)

References 7 publications

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“…However, from lots of measurements about the cyclone flow field, the boundary between the inner vortex and outer vortex is located at about 2/3R c . Additionally, according to measurements (Obermair [19]; Gil [20]), the vertical tube's velocity pattern was similar to the patterns usually found inside the standard cyclone. The outer main tangential velocity component at the upper part of the vertical tube is a feature of the flow pattern.…”

Section: )supporting

confidence: 78%

An Extended Model for Determining the Separation Performance of a Cyclone

Qian

Zhang

2006

Chem Eng & Technol

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Most models on the working of cyclones are based on cylinders and cones whereby the vertical tube and dustbin should also be included in their geometries. These separation models of conventional cylinder-on-cone cyclones do not consider the effect of the dust collection system on the flow field. In actual fact, the inclusion of the dust collection system had a considerable effect on the flow pattern in the gas cyclone as well as on the separation efficiency. In this paper, an extended model is presented, which is based on the time-of-flight approach. In this model, the gas residence time is modified so that the entire cyclone geometry is used. The lift force of a particle in the boundary layer is considered because of the larger velocity gradient here. The availability of the extended model is verified by comparison of the calculated grade efficiency with experimental data and theoretical counterparts in the literature.

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Section: )supporting

confidence: 78%

An Extended Model for Determining the Separation Performance of a Cyclone

Qian

Zhang

2006

Chem Eng & Technol

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“…The single phase flow of a gas cyclone separator with tangential inlet was simulated with four different turbulence models and all but the k-ε model could be validated against LDA measurement from literature [29] Moreover, the simulations demonstrated a peak in radial velocity just beneath the vortex finder entrance, caused by the lip leakage flow. There are no LDA measurements from this region but lip leakage is a well-known phenomenon in industrial cyclones and it is important that the models can predict it.…”

Section: Discussionmentioning

confidence: 95%

“…A cylinder-on-cone reverse-flow gas cyclone with tangential inlet, drop tube and dust bin (see Figure 1, Table 1), used in the experimental study by Obermair et al [29], is considered as the case study.…”

Section: Numerical Setupmentioning

confidence: 99%

“…In order to assess the capability of the turbulence models to represent the peculiarities of the flow field in the cyclone, the mean and RMS values of tangential and axial velocity profiles of single phase CFD simulations and LDA measurement data of [29] have been compared along two diameters in the conical part of the cyclone (shown in Figure 1). )).…”

Section: Comparison Of Turbulence Modelsmentioning

confidence: 99%

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Turbulence Modelling of a Single-Phase Flow Cyclone Gasifier

Jafari¹,

Hellström²,

Gebart³

2017

ENG

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The current work aims to make a foundation for an engineering design of a cyclone gasifier to be able not only to predict its flow field with a suitable accuracy but also to investigate a large number of design alternatives with limited computer resources. A good single-phase flow model that can form the basis in an Euler-Lagrange model for multi-phase flow is also necessary for modelling the reacting flow inside a cyclone gasifier. The present paper provides an objective comparison between several popular turbulence modelling options including standard k-ε and SST with curvature corrections, SSG-RSM and LES Smagorinsky models, for the single-phase flow inside cyclone separators/gasifiers that can serve as a guide for further work on the reacting multi-phase flow inside cyclone gasifiers and similar devices. A detailed comparison between the models and experimental data for the mean velocity and fluctuating parts of the velocity profiles are presented. Furthermore, the capabilities of the turbulence models to capture the physical phenomena present in a cyclone gasifier that affects the design process are investigated.

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“…Extensive investigations of the flow fields have been performed by experimental methods [5][6][7][8], numerical simulations [9,10], or both [11,12]. The experimental techniques for observing the swirling flows have been developed from Pitot tubes and hot-wire anemometers (HWA) to non-intrusive techniques such as laser Doppler anemometry (LDA) [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%