Strongly swirling flows in a cylindrical separator

Jawarneh, Ali M.; Tlilan, Hitham M.; Al-Shyyab, Ahmad; Ababneh, Amer Khalil

doi:10.1016/j.mineng.2007.10.012

Cited by 22 publications

(7 citation statements)

References 9 publications

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“…In the matter of fact, virtually all of the successful simulations with the RNG/k-ε model for vortex flows are reported by researchers who utilize the FLUENT® CFD solver [43][44][45][46][47][48][49][50][51][52]. In these simulations, two reasons were given for such prevalence of the RNG/k-ε model.…”

Section: The R ε /K-ε Turbulence Modelmentioning

confidence: 99%

Computations of shear driven vortex flow in a cylindrical cavity using a modified k-ε turbulence model

Saqr

Aly

Kassem

et al. 2010

International Communications in Heat and Mass Transfer

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Section: The R ε /K-ε Turbulence Modelmentioning

confidence: 99%

Computations of shear driven vortex flow in a cylindrical cavity using a modified k-ε turbulence model

Saqr

Aly

Kassem

et al. 2010

International Communications in Heat and Mass Transfer

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“…The RNG model, developed using methods by Yakhot and Orszag (1986), renormalizes the Navier-Stokes equations to focus on smaller scales of motion over the standard k-, thus leading to improved simulation performance regarding highly strained flows. This model is employed also due to its improved accuracy for capturing the effect of swirl on turbulence, and flows with strong streamline curvatures, vortices, and rotation (ANSYS R Fluent R , 2012;Hou & Zou, 2005;Jawarneh, Tlilan, Al-Shyyab, & Ababneh, 2008;Papageorgakis & Assanis, 1999). This simulation shows regions of highly strained flow near the inlets, thus making the choice of this model appropriate for this simulation.…”

Section: Conservation Equationsmentioning

confidence: 99%

CFD simulations of polymer devolatilization in steam contactors

Gabor

Shindle

Chandy

2017

Engineering Applications of Computational Fluid Mechanics

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Removal of volatiles and other unwanted products in a polymer mix is a critical step in polymer manufacturing. This process serves many purposes, such as improvement in the physical and chemical properties of the polymer, elimination of odours, recovery of monomers and solvents, and fulfilment of environmental regulations. In this study, the mixture of polymer and solvent, or cement, is mixed with superheated steam which causes the unwanted solvent to evaporate. As the cement droplets lose solvent and dry out, they are ejected as cement 'crumb' from the mixing device. This process is modelled using computational fluid dynamics (CFD) to gain insight into the complex phenomena. The model simulates the heat transfer and phase changes associated with cement and steam, via 3D axisymmetric calculations. Using an Eulerian-Lagrangian approach, the superheated steam is modelled as the continuous phase and tracked in an Eulerian frame, while the cement droplets are treated using a Lagrangian tracking method, thus as a whole allowing us to track the particle sizes, temperatures, and solvent content. Furthermore, a parametric study is carried out to analyse the effect of initial polymer temperature on final polymer product. The simulation is carried out with three different initial polymer temperatures and the resulting solvent concentration, and the size of the cement particles between the three cases are compared. By increasing the cement operating temperature, the solvent concentration in the cement crumb is significantly lower, and the final cement crumb sizes shows a slight decrease, which indicates better production performance. Indeed, full 3D CFD calculations, presented to verify the axisymmetric assumption, show differences in the particle statistics, which could have implications for design considerations. Such studies can provide further insights into control parameters that can potentially enhance the efficiency of such a manufacturing process. ARTICLE HISTORY

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“…Jawarneh et al [27,28] found that the double vortex generators technology, two centrifugal forces, are suitable in the separation process of a mixture involving oil and sand grains. The mixture-granular multiphase and renormalization group (RNG) of k- turbulence models were applied.…”

Section: Introductionmentioning

confidence: 99%

Double vortex generators for increasing the separation efficiency of the air separator

Jawarneh¹,

Al‐Widyan²,

Al-Migdady³

et al. 2017

IJHT

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This article presents a numerical analysis of multi-phase flow with powerful swirling streams in a cylindrical separator equipped with two vortex generators in an attempt to predict the separation efficiency of an air-water mixture. New design of a cylindrical separator is introduced for air-water mixture.The mixture multiphase and large eddy simulation (LES) turbulence models were applied. Images that concern velocity field, pressure, and volume fraction are introduced. Air phase is trapped and localized along the centerline of the separator and then migrates toward the upper exit hole, while water phase is distributed and rotated along the wall, then confined at the mid-separator due to two strong clock-wise centrifugal forces before it is expelled through its exit at mid of separator. It was found that the separation efficiency at constant Reynolds number of 8×10 4 with two feeding volume fractions of 95% and 90% are 97.8% and 96.1%, respectively. Also, the separation efficiency at constant feeding volume fraction of 95% with two Reynolds numbers of 2×10 5 and 8×10 4 are 98.6% and 97.8%, respectively. It is revealed that the separation efficiency will increase as the Reynolds number increases and/or increasing the volume fraction.

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Strongly swirling flows in a cylindrical separator

Cited by 22 publications

References 9 publications

Computations of shear driven vortex flow in a cylindrical cavity using a modified k-ε turbulence model

Computations of shear driven vortex flow in a cylindrical cavity using a modified k-ε turbulence model

CFD simulations of polymer devolatilization in steam contactors

Double vortex generators for increasing the separation efficiency of the air separator

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