Turbulent flow of viscoelastic liquids through an axisymmetric sudden expansion

Poole, Robert J.; Escudier, M. P.

doi:10.1016/j.jnnfm.2003.11.007

Cited by 41 publications

(33 citation statements)

References 26 publications

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“…However, there have been few studies on the drag-reducing effect for turbulent flow in complicated flow geometries, and in particular, to the authors' knowledge there has never been any DNS of turbulent viscoelastic flow with an orifice. Some authors (e.g., Pak et al, 1990;Poole and Escudier, 2003;Poole and Escudier, 2004;Poole et al, 2005) carried out experiments on the flow through a sudden expansion, but focused on the mean flow, which could cause an asymmetric flow pattern even when the geometry itself is symmetric. It is practically 0142-727X/$ -see front matter Ó 2011 Elsevier Inc. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

DNS of viscoelastic turbulent channel flow with rectangular orifice at low Reynolds number

Tsukahara

Kawase

Kawaguchi

2011

International Journal of Heat and Fluid Flow

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Section: Introductionmentioning

confidence: 99%

DNS of viscoelastic turbulent channel flow with rectangular orifice at low Reynolds number

Tsukahara

Kawase

Kawaguchi

2011

International Journal of Heat and Fluid Flow

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“…Most of these Newtonian turbulent works are concerned with the corresponding axisymmetric geometry [2,3] given their easier construction and inherent symmetry. Limited results for viscoelastic fluids in turbulent flow have also been reported in both planar [4] and axisymmetric geometries [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The effect of expansion ratio for creeping expansion flows of UCM fluids

Poole

Pinho

Alves

et al. 2009

Journal of Non-Newtonian Fluid Mechanics

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a b s t r a c tA systematic numerical investigation on creeping flows in planar sudden expansions of viscoelastic fluids obeying the upper-convected Maxwell model is carried out to assess the combined effects of viscoelasticity, through the Deborah number, and expansion ratio (ER), which was varied between 1.25 and 32. At large expansion ratios (ER ≥ 4) the flow becomes dominated by the downstream duct size and appropriately normalized quantities tend to be independent of ER. The recirculation size and strength become decreasing functions of De, whereas the Couette correction (the normalized entry pressure drop due to the presence of the expansion) increases. At small ER (ER ≤ 3), however, no simple scaling laws are found and there is a complex interaction between De and ER leading to non-monotonic variations, with an initial decrease in the recirculation length at low Deborah numbers, followed by an enhancement as De increases.

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“…As further proof of the consistency of the numerical model, we simulated single-phase flow through a sudden enlargement in a horizontal pipe. In particular, we reproduced the scenarios considered by Founti and Klipfel (1998) and Poole and Escudier (2004). The comparison of the distributions of axial velocity and turbulent kinetic energy revealed good agreement in both cases.…”

Section: Computational Methodology and Consistency Of The Numerical Smentioning

confidence: 88%

Numerical investigation of solid-liquid slurry flow through an upward-facing step

Messa¹,

Malavasi²

2013

Journal of Hydrology and Hydromechanics

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Abstract:The flow of a solid-water mixture through an upward-facing step in a channel is numerically investigated. The effect of expansion ratio, mean solids volume fraction and particle diameter on the velocity field, pressure distribution and solid volume fraction field is studied. Expansion ratios of 0.50 and 0.67, particle diameter of 125 µm and 440 µm and mean solid volume fraction between 0.05 and 0.20 are considered. Particle density is 2465 kg m -3 . An Eulerian twofluid model is used to simulate the flow. Due to the lack of experimental data, the model was validated by comparison to other numerical investigations and to experimental data about the horizontal pipe case. Afterwards, it is studied the effect of the above mentioned parameters upon the degree of coupling between the phases and the extension of the disturbance region in the pressure and solid volume fraction fields downstream the step. Parameters of engineering interest, such as the reattachment length and the pressure recovery downstream the enlargement, are investigated.

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Turbulent flow of viscoelastic liquids through an axisymmetric sudden expansion

Cited by 41 publications

References 26 publications

DNS of viscoelastic turbulent channel flow with rectangular orifice at low Reynolds number

DNS of viscoelastic turbulent channel flow with rectangular orifice at low Reynolds number

The effect of expansion ratio for creeping expansion flows of UCM fluids

Numerical investigation of solid-liquid slurry flow through an upward-facing step

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