The motion of a rotating circular cylinder in a stream of Bingham plastic fluid

Thakur, Pooja; Mittal, Shikhar; Tiwari, Naveen; Chhabra, R.P.

doi:10.1016/j.jnnfm.2016.06.013

Cited by 23 publications

(14 citation statements)

References 37 publications

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“…The CFD solution is difficult to get as the regularization law is close to the real model of a yield stress fluid. Moreover, this approach does not always guarantee to converge to the correct stress field but some works have shown the ability of such regularized models to get yield surfaces for few nontrivial flows (Burgos et al 1999;Alexandrou et al 2001;Nirmalkar et al 2013;Jeong 1013;Thakur et al 2016).…”

Section: Introductionmentioning

confidence: 99%

On the Determination of the Yield Surface within the Flow of Yield Stress Fluids using Computational Fluid Dynamics

Schaer¹,

Vazquez²,

Dufresne³

et al. 2018

JAFM

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A part of non-Newtonian fluids are yield stress fluids. They require a minimum stress to flow. Below this minimum value, yield stress fluids remain solid. To date, 1D and 2D numerical models have been used predominantly to study free surface flows. However, some phenomena have three-dimensional behaviour such as the appearance of the limit between the liquid regime and the solid regime. Here the aim is to use a Computational Fluid Dynamics (CFD) to reproduce the properties of the free surface flow of yield stress fluids in an open channel. Modelling the behaviour of the yield stress fluid is also expected. The numerical study is driven with the software OpenFOAM. Numerical outcomes are compared with experimental results from model experiment and theorical predictions based on the rheological constitutive law. The 3D model is validated by evaluating its capacity to reproduce reliably flow patterns. The depth, the local velocity and the stress are quantified for different numerical configurations (grid level, rheological parameters). Then numerical results are used to detect the presence of rigid and sheared zones within the flow.

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Section: Introductionmentioning

confidence: 99%

On the Determination of the Yield Surface within the Flow of Yield Stress Fluids using Computational Fluid Dynamics

Schaer¹,

Vazquez²,

Dufresne³

et al. 2018

JAFM

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“…This procedure yields four dimensionless groups, namely, Reynolds number (Re), Prandtl number (Pr), Bingham number (Bn) and rotational velocity (α). Due to the uncoupled nature of the momentum and energy equations, the momentum characteristics are thus influenced by the values of Re, Bn and α (Thakur et al, 2016), whereas heat transport shows additional dependence on the Prandtl number in the present case. These are defined here as follows.…”

Section: Continuity Equationmentioning

confidence: 80%

“…(1)-(3), subject to the aforementioned boundary conditions, have been solved numerically using COMSOL multiphysics (Version 4.3a) solver. Since the numerical methodology employed in the present work is similar to that used in our previous studies (Thakur et al, 2016;Thumati et al, 2018), only the salient features are described here. The resulting system of equations is solved using the steady, 2D, laminar flow and heat transfer module using the constant fluid properties.…”

Section: Numerical Methodology and Choice Of Numerical Parametersmentioning

confidence: 99%

“…Their predictions of the velocity field were found to be in fair agreement with the available scant experimental results. On the other hand, Thakur et al (2016) have recently reported on the hydrodynamic forces (drag, torque, etc.) for a cylinder rotating in a uniform stream of Bingham plastic fluids and they elucidated the combined effects of Re, Re r and Bn on the momentum transfer characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Forced Convection in a Bingham Plastic Fluid from a Heated Rotating Cylinder

Thakur

Tiwari

Chhabra

2019

J. Chem. Eng. Japan / JCEJ

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In this work, forced convection heat transfer from a heated rotating cylinder in a stream of a Bingham plastic uid has been investigated numerically over wide ranges of Reynolds number (0.1≤Re≤40), Prandtl number (10≤Pr≤100), Bingham number (0≤Bn≤10 3) and dimensionless rotational velocity (0≤α≤5). The results are presented in terms of the isotherm contours and Nusselt number (local and average). Also, the e ects of the cylinder rotation and uid yield stress are examined on the relative increase or decrease in the rate of heat transfer relative to a stationary cylinder (α 0) and in a Newtonian uid (Bn 0). At high Bingham numbers, heat transfer increases more than 100% with respect to the value in Newtonian uids and approximately by 70% over and above its value for a stationary cylinder. Finally, the Nusselt number results have been consolidated as a function of Re, Pr, Bn and α via a simple expression.

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“…However, with increasing the cylinder rotation speed, the wake becomes narrower and deflects sideways. Thakur et al . examined the rotating cylinder in the Bingham plastic fluid at low Reynolds numbers from 0.1 to 40 and R.S between 0 and 5.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the convective heat transfer and flow behavior around two counter‐rotating side‐by‐side cylinders

Darvishyadegari

Hassanzadeh

2018

Heat Trans. Asian Res.

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This study presents details of the heat and fluid flow around two counter-rotating cylinders. For this goal, three different nondimensional gap spaces such as G/D = 1.5, 2.0, and 3.0 are examined in the constant Reynolds number of 200 and Prandtl number of 7.0. In addition, computations are carried out at various nondimensional rotating speeds (R.S) in the range from 0 to 4. The obtained results are validated against the available data in the open literature for stationary cases.The results showed that the flow structure, vortex shedding process, and exerted forces on the cylinders strongly depended on the R.S and G/D. Reductions of the drag coefficients are observed for both cylinders with increasing the R.S due to suppression of the wake downstream of the cylinders at low R.S and eliminating the vortex shedding process at high R.S. Finally, it is demonstrated that, regardless of the G/D value, increasing the R.S

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The motion of a rotating circular cylinder in a stream of Bingham plastic fluid

Cited by 23 publications

References 37 publications

On the Determination of the Yield Surface within the Flow of Yield Stress Fluids using Computational Fluid Dynamics

On the Determination of the Yield Surface within the Flow of Yield Stress Fluids using Computational Fluid Dynamics

Forced Convection in a Bingham Plastic Fluid from a Heated Rotating Cylinder

Analysis of the convective heat transfer and flow behavior around two counter‐rotating side‐by‐side cylinders

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