Pipe Flow Measurements of a Transparent Non-Newtonian Slurry

Park, J. T.; Mannheimer, R. J.; Grimley, Terrence A.; Morrow, Thomas B.

doi:10.1115/1.3243648

Cited by 52 publications

(35 citation statements)

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“…Lenoble et al (2005a) and Wiederseiner (2010) measured the velocity profiles in a rheometer (in a parallel-plate and a wide-gap Couette cell, respectively). Averbakh et al (1997), Koh et al (1994), Lyon and Leal (1998a, b), Park et al (1989), Shauly et al (1997), and Zisselmar and Molerus (1979) observed the flow of concentrated slurries in pipes. Wildman et al (1992) looked at pipe contraction flows.…”

Section: Fluidized Beds and Particle Suspensionsmentioning

confidence: 96%

Refractive-index and density matching in concentrated particle suspensions: a review

et al. 2010

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Optical measurement techniques such as particle image velocimetry (PIV) and laser Doppler velocimetry (LDV) are now routinely used in experimental fluid mechanics to investigate pure fluids or dilute suspensions. For highly concentrated particle suspensions, material turbidity has long been a substantial impediment to these techniques, which explains why they have been scarcely used so far. A renewed interest has emerged with the development of specific methods combining the use of iso-index suspensions and imaging techniques. This review paper gives a broad overview of recent advances in visualization techniques suited to concentrated particle suspensions. In particular, we show how classic methods such as PIV, LDV, particle tracking velocimetry, and laser induced fluorescence can be adapted to deal with concentrated particle suspensions.

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Section: Fluidized Beds and Particle Suspensionsmentioning

confidence: 96%

Refractive-index and density matching in concentrated particle suspensions: a review

et al. 2010

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“…The test cases considered for this article. The first two are from Slatter [13], PARK1 is from Park et al [48], and the last two belong to experimental data supplied by the co-authors [49]. [49] In all simulations, the length of the pipe was set to L = 30 to 45 m (longer for a thicker pipe, L D > 300) to ensure that the flow reached a fully developed state and to avoid interference from the outflow boundary.…”

Section: Meshmentioning

confidence: 99%

“…The error in the rheological measurements is a maximum of 1.46% [50]. Park et al [48] mention that their rheological parameters were obtained by linear regression of viscometric data, with a coefficient of determination of 0.996.…”

Section: Meshmentioning

confidence: 99%

A Wall Boundary Condition for the Simulation of a Turbulent Non-Newtonian Domestic Slurry in Pipes

Mehta

Radhakrishnan

Lier

et al. 2018

Water

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Abstract:The concentration (using a lesser amount of water) of domestic slurry promotes resource recovery (nutrients and biomass) while saving water. This article is aimed at developing numerical methods to support engineering processes such as the design and implementation of sewerage for concentrated domestic slurry. The current industrial standard for computational fluid dynamics-based analyses of turbulent flows is Reynolds-averaged Navier-Stokes (RANS) modelling. This is assisted by the wall function approach proposed by Launder and Spalding, which permits the use of under-refined grids near wall boundaries while simulating a wall-bounded flow. Most RANS models combined with wall functions have been successfully validated for turbulent flows of Newtonian fluids. However, our experiments suggest that concentrated domestic slurry shows a Herschel-Bulkley-type non-Newtonian behaviour. Attempts have been made to derive wall functions and turbulence closures for non-Newtonian fluids; however, the resulting laws or equations are either inconsistent across experiments or lack relevant experimental support. Pertinent to this study, laws or equations reported in literature are restricted to a class of non-Newtonian fluids called power law fluids, which, as compared to Herschel-Bulkley fluids, yield at any amount of applied stress. An equivalent law for Herschel-Bulkley fluids that require a minimum-yield stress to flow is yet to be reported in literature. This article presents a theoretically derived (with necessary approximations) law of the wall for Herschel-Bulkley fluids and implements it in a RANS solver using a specified shear approach. This results in a more accurate prediction of the wall shear stress experienced by a circular pipe with a turbulent Herschel-Bulkley fluid flowing through it. The numerical results are compared against data from our experiments and those reported in literature for a range of Reynolds numbers and rheological parameters that are relevant to the prediction of pressure losses in a sewerage transporting non-Newtonian domestic slurry. Nonetheless, the application of this boundary condition could be extended to areas such as chemical and food engineering, wherein turbulent non-Newtonian flows can be found.

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“…Park et al [5] used laser techniques to investigate the turbulent structure of nonNewtonian slurries. Higher intensities were observed in the wall region when compared with that of air.…”

Section: Evidence Of Particle Roughnessmentioning

confidence: 99%

CFD modelling of wall-particle interactions under turbulent flow conditions

Mollagee¹

2006

WIT Transactions on Engineering Sciences, Vol 52

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The effects of particle roughness and the impact it has on the development of turbulence in non-Newtonian slurry flow remains difficult to predict. The common analytical tools used take only the viscous characteristics of the slurry into account. Homogenous solid-liquid suspensions are often described using different continuum models. Evidence suggests that these models may be inadequate due to the presence of solid particles sharply influencing velocity gradients. Experimental work was conducted using homogenous non-Newtonian slurries. Comparisons were made of wall-particle interactions experienced for slurries with different representative particle sizes. This was subsequently modeled using the FLUENT Computational Fluid Dynamics software to validate these findings. This paper documents these findings and presents a comparison between the experimental and the computational model.

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Pipe Flow Measurements of a Transparent Non-Newtonian Slurry

Cited by 52 publications

References 0 publications

Refractive-index and density matching in concentrated particle suspensions: a review

Refractive-index and density matching in concentrated particle suspensions: a review

A Wall Boundary Condition for the Simulation of a Turbulent Non-Newtonian Domestic Slurry in Pipes

CFD modelling of wall-particle interactions under turbulent flow conditions

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