Hydrodynamic Simulation of Cyclone Separators

Utikar, Ranjeet P.; Darmawan, Nina; Tadé, Moses; Qin, Li; Evans, G. R.; Glenny, M.; Pareek, Vishnu

doi:10.5772/7106

Cited by 34 publications

(25 citation statements)

References 55 publications

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“…The abrasive particles were traced in a Lagrangian reference frame as discrete particles. The most eroded part was at the intersection between the hydrocyclone cylindrical and conical body parts, which was in good accordance with the findings of Utikar et al (2010). From a spatial analysis of the erosion rates, one can conclude that increases in the feed velocity, solid concentration, and particle size increased the erosion field at the upper part of the cylindrical body in front of the tangential inlet.…”

Section: Discussionsupporting

confidence: 77%

“…3, assumption of spherical sand particles, and the isothermal assumption of the flow in the hydrocyclone. The most eroded part was at the intersection between the cyclone cylindrical part and the conical part, which was in good agreement with the findings of Utikar et al (2010). At the region close to the underflow discharge, the erosion is quite low although due to the area restriction and rise of the solid concentration, a different outcome could be expected.…”

Section: Erosion Modelingsupporting

confidence: 81%

“…Erosion in hydrocyclones is an important phenomenon, which is not studied to our best knowledge in the literature in detail. Only Utikar et al (2010) investigated the erosion caused by solid particles entrained in the gas flow in a cyclone separator. In the present study, beside the fluid dynamics study of a hydrocyclone and determination of separation efficiency curves using an Euler-Euler (Eu-Eu) approach, the particle tracking and erosion intensity inside the hydrocyclone are investigated in detail, applying the Euler-Lagrange (Eu-La) approach.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of hydroabrasion in a hydrocyclone

Azimian

Bart

2016

Pet. Sci.

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The velocity profiles and separation efficiency curves of a hydrocyclone were predicted by an Euler-Euler approach using a computational fluid dynamics tool ANSYS-CFX 14.5. The Euler-Euler approach is capable of considering the particle-particle interactions and is appropriate for highly laden liquid-solid mixtures. Predicted results were compared and validated with experimental results and showed a considerably good agreement. An increase in the particle cut size with increasing solid concentration of the inlet mixture flow was observed and discussed. In addition to this, the erosion on hydrocyclone walls constructed from stainless steel 410, eroded by sand particles (mainly SiO 2 ), was predicted with the Euler-Lagrange approach. In this approach, the abrasive solid particles were traced in a Lagrangian reference frame as discrete particles. The increases in the input flow velocity, solid concentration, and the particle size have increased the erosion at the upper part of the cylindrical body of the hydrocyclone, where the tangential inlet flow enters the hydrocyclone. The erosion density in the area between the cylindrical to conical body area, in comparison to other parts of the hydrocyclone, also increased considerably. Moreover, it was observed that an increase in the particle shape factor from 0.1 to 1.0 leads to a decrease of almost 70 % in the average erosion density of the hydrocyclone wall surfaces.

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Section: Discussionsupporting

confidence: 77%

Section: Erosion Modelingsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of hydroabrasion in a hydrocyclone

Azimian

Bart

2016

Pet. Sci.

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“…The length scale L for the smallest element of our mesh model was set at 2.5 × 10 −5 m. All of these settings resulted in a value of 50 for the / term. According to a conclusion by Utikar et al [29], fluid phase and solid phase could be considered uncoupled if the value of / was less than 100; therefore, only one-way simulation was needed for our problem. Our simulation was done with Fluent software.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

A Problem of Particulate Contamination in an Automated Assembly Machine Successfully Solved by CFD and Simple Experiments

Thongsri

2017

Mathematical Problems in Engineering

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Assembly of hard disk drives (HDDs) needs to be done in an automated assembly machine (AAM) virtually free of particulate contamination that can cause them to malfunction. Fan filter units (FFUs) are installed above the AAM to reduce the number of suspended particles in the recirculating air flowing over and around them. At one time, several HDDs were found to be defective. To find out the root cause of this problem, computational fluid dynamics (CFD) was used to investigate the airflow over and around the AAM. It was found that the cause of the high particle counts was improper air speed from the FFUs. The optimal FFUs air speed needed to be in the range of 0.35-0.65 m/s in which the airflow would block out nearby airborne particles and purge away particles generated by the AAM effectively which would, in effect, reduce the particle counts down below the threshold level of class 100 clean room. A few available measurement tools at the factory were then used to perform validating measurements against the simulation results, and the validation was positive. This optimal speed range was implemented at the factory after which the level of contamination was reduced to an acceptable level.

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“…With deepened understanding and increases in computational resources, analysis models have expanded in complexity to include higher order discretization schemes and increasingly complex multi-phase models paired with anisotropic turbulence models such as various different Reynolds stress models (RSM) in RANS (Reynolds-averaged Navier-Stokes) simulations or unsteady RANS and large-eddy simulation (LES). For a more detailed discussion [15].…”

Section: Introductionmentioning

confidence: 99%

Dispersed two-phase flow in a gas–liquid cylindrical cyclone separator

Mehring¹

2016

Int. J. CMEM

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The performance of a gas-liquid cylindrical cyclone separator for the separation of air bubbles from hydraulic fluid has been analyzed numerically using the commercial computational fluid dynamics flow solver CFX. Two-phase flow behavior is modeled based on an Eulerian-Eulerian approach, representing both liquid and dispersed gas phase as interpenetrating media with interphase momentum transfer captured based on existing bubble drag models. Only a single bubble size is considered for the dispersed phase and bubble coalescence is ignored. At the tangential inlet, a homogeneous gasliquid mixture is assumed with specified mass flow and air/liquid volume fractions. Pressure conditions were imposed at both the upper gas outlet and the lower liquid outlet boundaries. Effect of changes in turbulence model and bubble drag model on analysis predictions was analyzed for selected operating conditions, that is, bubble sizes, air/liquid volume fractions and flow rates. Separation efficiency was high only for larger bubble sizes (100 mm) and high flow rates (250 L/min). For bubble sizes below 35 mm, the cyclone was ineffective. At high flow rates, cyclone performance suffers due to liquid carry over in the form of a swirling liquid wall film carried with the gas (bubble) phase through the top outlet. The Explicit Algebraic Reynolds Stress Turbulence Model together with the Grace Drag Model was found to be effective in exploring changes to the cyclone geometry. Here, improvements in separation efficiency were only achieved with significantly increased tangential velocities as a consequences of a reduced inlet port cross section. Predicted bubble size separation limits as a function of Reynolds number and axial-to-tangential velocity ratios were found to compare favorably with existing literature.

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Hydrodynamic Simulation of Cyclone Separators

Cited by 34 publications

References 55 publications

Numerical analysis of hydroabrasion in a hydrocyclone

Numerical analysis of hydroabrasion in a hydrocyclone

A Problem of Particulate Contamination in an Automated Assembly Machine Successfully Solved by CFD and Simple Experiments

Dispersed two-phase flow in a gas–liquid cylindrical cyclone separator

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