Influence of geometric dimensions on the performance of a filtering hydrocyclone: an experimental and cfd study

Oliveira, D. C.; Almeida, Celso A.K.; Vieira, Luiz Gustavo Martins; Damasceno, João Jorge Ribeiro; Barrozo, Marcos A.S.

doi:10.1590/s0104-66322009000300013

Cited by 57 publications

(30 citation statements)

References 10 publications

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“…These granular materials have been used in several applications (Barrozo et al 1996;Santos et al, 2012;Ribeiro et al 2005;Silva et al 2011;Oliveira et al 2009). It can be observed, by means of Table 2, that the particle-wall friction coefficient (μp-w) is higher for irregular particles (lower values of ϕ) compared to round particles (higher values of ϕ), which can be attributed to the fact that irregular particles have higher surface contact area and their rotations are therefore more suppressed, as would be expected.…”

Section: Resultsmentioning

confidence: 99%

Transition Phenomenon Investigation Between Different Flow Regimes in a Rotary Drum

Santos

Scatena

Duarte

et al. 2016

Braz. J. Chem. Eng.

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-Rotary drums can show different granular flow regimes each one with its own specific flow behavior, which increase the complexity in their study. The way particles move inside the rotary drum is directly related to the mass and energy transfer rates, and consequently to the process performance. Thus, an experimental investigation regarding the transition between different flow regimes inside a rotary drum was carried out in the present work. To the best of our knowledge, the hysteresis phenomenon was observed for the first time in the transition between cataracting-centrifuging regimes, which was shown to be dependent on the physical properties of the particles such as sphericity, density and particle-wall friction coefficient. A new expression for the centrifuging critical rotation speed was proposed in this work.

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Section: Resultsmentioning

confidence: 99%

Transition Phenomenon Investigation Between Different Flow Regimes in a Rotary Drum

Santos

Scatena

Duarte

et al. 2016

Braz. J. Chem. Eng.

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“…In this context, our research group [18][19][20][21][22] designed a new hydrocyclone, where a conical filtering wall replaced the conical section of a conventional hydrocyclone and the resulting device was named as filtering hydrocyclone. A filtering hydrocyclone is operated analogously to conventional hydrocyclone, however, besides to the underflow and overflow streams, there is an additional stream that is the filtrate produced in the porous cone of this novel equipment (Fig.…”

Section: Page 2 Chemical Engineering and Technologymentioning

confidence: 99%

Effect of Inlet Diameter on the Performance of a Filtering Hydrocyclone Separator

2016

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Hydrocyclones are separators used in several industry fields, such as mining, food and petrochemical. Our research group designed a new hydrocyclone, in which a conical filtering wall replaces the conical section, producing another liquid stream leaving the equipment, besides underflow and overflow streams. In the present work, the influence of inlet diameter (Di) of a filtering hydrocyclone was analyzed by an experimental and CFD study. Data from conventional hydrocyclones of the same configurations were also obtained. Under the same operating conditions and geometry, the filtering hydrocyclone presented a better performance than the conventional device. Under the experimental conditions evaluated, an increase in inlet diameter by a factor of 2.2 reduces the Euler number by 84%. Keywords: Hydrocyclones, solid-liquid separation, unit operations IntroductionHydrocyclones are very simple devices, that consist of a conical section, open at its apex (underflow), joined to a cylindrical section, which has a tangential feed inlet [1]. The top of the cylindrical section is closed with a plate with an axially mounted overflow pipe. Despite the apparent simplicity, hydrocyclones are very efficient to promote solid-liquid and liquid-liquid separations. These devices convert pressure generated by a centrifugal pump into centrifugal force, causing suspended solids in the mud to be separated from the fluid. This separation is actually accelerated settling due to the increased gravitational force cause by the centrifugal action inside the cone. The action inside the hydrocyclone can multiply gravitational force by as much as 200 times [2].Application of hydrocyclone for particles separation is widespread due to advantages such as low cost, simple structure, large capacity and low volume [3]. Despite its simplicity, the flow behavior in a hydrocyclone is quite complex. The internal flow in these devices is totally turbulent and presents high vorticity preservation, vortex breakdown, flow inversion, air core etc. However, advances in computational technology, over recent years, have led to models based on fundamental fluid flow to predict the performance of the equipment. Computational Fluid Dynamics (CFD) is an important www.cet-journal.com Page 2 Chemical Engineering & TechnologyThis article is protected by copyright. All rights reserved.technique to study the fluid dynamics of many physical systems and it has been used widely in several engineering applications [4,5], including modelling flow in hydrocyclones [6][7][8][9][10][11][12][13][14][15].The literature presents some classic designs of hydrocyclones (also called families), in which the main design variable is the cylindrical diameter (Dc), and the other geometric dimensions are related to this one. The use of a certain family of hydrocyclones is generally restricted to the demand for a specific application [16].For improving the performance of hydrocyclones, many modifications in the conventional configurations of this device have been proposed in the literatur...

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“…Today, with the rapid improvement of computational resources, numerical simulation studies using the Computational Fluid Dynamics (CFD) technique have become popular in several fields of engineering (Vieira et al, 2005;Vieira Neto et al, 2008;Cunha et al, 2009;Barrozo et al, 2010, Oliveira et al, 2009, Pereira et al, 2007, helping to shed light on the fluid dynamic behavior of annular flows. Fisher et al (2000) incorporated the effect of porosity at the system's boundary into their simulations.…”

Section: Introductionmentioning

confidence: 99%

The effect of the inner cylinder rotation on the fluid dynamics of non-Newtonian fluids in concentric and eccentric annuli

Neto

Martins

Ataíde

et al. 2014

Braz. J. Chem. Eng.

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-Helical flow in an annular space occurs during oil drilling operations. The correct prediction of flow of drilling fluid in an annular space between the wellbore wall and the drill pipe is essential to determine the variation in fluid pressure within the wellbore. This paper presents experimental and CFD simulation results of the pressure drop in the flow of non-Newtonian fluids through a concentric annular section and another section with fixed eccentricity (E = 0.75), using aqueous solutions of two distinct polymers (Xanthan Gum and Carboxymethylcellulose). The hydrodynamic behavior in this annular system was analyzed based on the experimental and CFD results, providing important information such as the formation of zones with preferential flows and stagnation regions.

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Influence of geometric dimensions on the performance of a filtering hydrocyclone: an experimental and cfd study

Cited by 57 publications

References 10 publications

Transition Phenomenon Investigation Between Different Flow Regimes in a Rotary Drum

Transition Phenomenon Investigation Between Different Flow Regimes in a Rotary Drum

Effect of Inlet Diameter on the Performance of a Filtering Hydrocyclone Separator

The effect of the inner cylinder rotation on the fluid dynamics of non-Newtonian fluids in concentric and eccentric annuli

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