Numerical study of flow field in cyclones of different height

Xiang, R. B.; Lee, K.W.

doi:10.1016/j.cep.2004.09.006

Cited by 132 publications

(60 citation statements)

References 9 publications

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“…It can be observed that near the duct underflow position, 0.135 m, the profile resembles the parabolic behavior, with the concave side up, because the temperature of the conical wall is warmer than the center of the hydrocyclone and the fluid flow is downward in this region. At the axial positions 0.275 m and 0.412 m, the temperature profiles have approximately similar behavior, because the areas of recirculation and reverse flow present in this region and this is consistent with the literature [1,11,15].…”

Section: Resultssupporting

confidence: 79%

Non-Isothermal Separation Process of Two-Phase Mixture Water/Ultra-Viscous Heavy Oil by Hydrocyclone

Souza¹,

Farias²,

Swarnakar³

et al. 2011

ACES

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Environmental agencies do not allow effluents, from the petroleum productions, which contain oil concentrations that exceed the amounts permitted by the regulations. In recent time heavy oil operating petroleum industries are generating oil/water mixture by products, which are difficult to separate. Industrially, hydrocyclone is generally used to separate oil from an oil/water mixture. This is due to its high performance of separation, low cost of installation and maintenance. In the present work, therefore, the thermal fluid dynamics of water/ultra-viscous heavy oil separation process in a hydrocyclone has been studied. A steady state mathematical model which simulates the performance of a non-isothermal separation process is presented. The Eulerian-Eulerian approach for the interface of the phases involved (water/ultra-viscous heavy-oil) is used and the two-phase flow is considered as incompressible, viscous and turbulent. For carrying out numerical solutions of the governing equations the CFX11 ® commercial code was used. Results of the behavior of the two-fluid flow inside the hydrocyclone and separation efficiency are presented and analyzed. The role of the average temperature of the fluid, oil droplet diameter and the fluid mixture inlet velocity on the separation efficiency of the hydrocyclone are verified.

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Section: Resultssupporting

confidence: 79%

Non-Isothermal Separation Process of Two-Phase Mixture Water/Ultra-Viscous Heavy Oil by Hydrocyclone

Souza¹,

Farias²,

Swarnakar³

et al. 2011

ACES

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“…Their study of the effect of the inlet velocity on the pressure drop found that the RSM gave the closest agreement with the experimental results. The superiority of the RSM over other models has been established by Meier et al (1999), Xiang et al (2005), Qian et al (2006), Wan et al (2008) and Kaya et al (2009). These investigations of various characteristics of cyclone separator flow field, such as velocity profiles, pressure drop, effect of particle size, mass loading, separation efficiency, effect of pressure and temperature, have reemphasized the ability of the RSM for realistic prediction of the flow field inside cyclone separators.…”

Section: Choice Of Turbulence Modelmentioning

confidence: 99%

Hydrodynamic Simulation of Cyclone Separators

Utikar¹,

Darmawan²,

Tadé³

et al. 2010

Computational Fluid Dynamics

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“…The CFD-3D analysis is an efficient and economical approach of understanding the fluid dynamics process in complex plants, providing a precious way to evaluate how it is affected by changes of operating conditions and geometric shapes. At this aim, the CFD approach has been used by many authors [1,[8][9][10][11][12][13][14][15]; the papers deal with issues relative to the flow of gas-solid suspensions predicting solid separation efficiency, at different operating conditions, in good agreement with the experimental evidences. Furthermore, in [13][14][15] the authors proved as the Reynolds Stress Model is the suitable turbulent model for cyclone with strong swirling flow.…”

Section: State Of the Artmentioning

confidence: 53%

“…At present, in literature, it is proved that the most utilized turbulence modelling is the RSM turbulence model [1,3,[8][9][10][11][12][13][14]. In addition, all these papers simulate isothermal plants while, the present work has to take into account the thermal exchange in its various forms (convection and radiation).…”

Section: Numerical Modelmentioning

confidence: 99%

“…At this aim, a lot of studies available in literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], developed by many authors, have been widely studied, both numerically and experimentally, with the main goal of increasing the separation efficiency. Multiple studies [1][2][3][4][5][6][7][8] demonstrated the decisive influence of both operating parameters and design on the separation efficiency and pressure drop.…”

Section: State Of the Artmentioning

confidence: 99%

See 1 more Smart Citation

Numerical study of the separation efficiency and heat exchange performance in a complex gas–solid separator

Mariani¹,

Risi²,

Poggiani³

2016

Int. J. CMEM

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This work presents a study on a gas-solid cyclone separator used in a complex cement production plant. The main objective of the study is based on the performance evaluation and optimization of the cyclone separator in terms of particle separation and heat transfer efficiencies, while keeping pressure losses under control. The thermal interaction is between two gas-solid mixtures, one at 850°C and the other at 600°C, respectively. The solid phase consists mostly of calcium carbonate subsequently intended to the so-called baking process for the production of clinker and ultimately cement. A first model has been setup using experimental data as boundary conditions to assess the physical model behavior and the CFD solver parameters. After that, five additional models with different geometries have been analyzed to evaluate the influence of the vortex finder (vf) length on the separation efficiency and on the heat exchange performance. By increasing the length of the vf, the results show a global improvement in the separation efficiency of up to 5% if compared to the geometry without the vf. Further, the increase in the vf length determines a monotonic decrease of temperature at the exit but a monotonic increase of pressure losses. In the second part of this work, using one of the previous models with vf, a study of the influence of the particle diameter on the separation efficiency has been performed. The increase of particle diameter causes an increase of the separation and thermal exchange performance, decreasing at the same time the pressure drop. The numerical approach for all the cases is based on implicit unsteady simulations using the Eulerian Multiphase model.

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Numerical study of flow field in cyclones of different height

Cited by 132 publications

References 9 publications

Non-Isothermal Separation Process of Two-Phase Mixture Water/Ultra-Viscous Heavy Oil by Hydrocyclone

Non-Isothermal Separation Process of Two-Phase Mixture Water/Ultra-Viscous Heavy Oil by Hydrocyclone

Hydrodynamic Simulation of Cyclone Separators

Numerical study of the separation efficiency and heat exchange performance in a complex gas–solid separator

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