Numerical Investigation Of Non-Newtonians Fluids Flows Between Two Rotating Cylinders Using Lattice Boltzmann Method

Khali, Samir; Nebbali, Rachid; Bouhadef, Khedidja

doi:10.5281/zenodo.1088418

2013

DOI: 10.5281/zenodo.1088418

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Numerical Investigation Of Non-Newtonians Fluids Flows Between Two Rotating Cylinders Using Lattice Boltzmann Method

Samir Khali¹,

Rachid Nebbali²,

Khedidja Bouhadef³

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2019

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Taylor-Couette flow of shear-thinning fluids

Cagney

Balabani

2019

Physics of Fluids

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The flow between two concentric cylinder, one of which is rotating (Taylor-Couette flow), has been the focus of extensive research, due to the number of flow instabilities that may occur and its use in various industrial applications. We examine Taylor-Couette flow of Newtonian and shear-thinning fluids (solutions of xanthan gum in water/glycerol) using a combination of Particle-Image Velocimetry and flow-visualisation for a wide range of Reynolds number, spanning the Circular Couette Flow, Taylor Vortex Flow and Wavy Vortex Flow regimes. Shear-thinning is associated with an increase in the axial wavelength and has a non-monotonic effect on the critical Reynolds number for transition to Taylor Vortex Flow and Wavy Vortex Flow. The magnitude of vorticity and the strength of the radial jets transporting fluid away from the inner cylinder ('outward jets') are both reduced in shear-thinning fluids relative to the Newtonian case; the vorticity in the shear-thinning fluids also tends to concentrate at the edges of vortices, rather than in the cores. In the Wavy Vortex Flow regime for Newtonian fluids, the amplitudes of the waves at the 'inward jets' (moving towards the inner cylinder) are low compared to those at the outward jets. However, for the shear-thinning fluids, the amplitudes of the waves at both the inward and outward jets tend to be significantly larger. Finally, shear-thinning is associated with greater variations in time and space: we observe slow drifts in the axial positions of vortices and spatial variations in the amplitudes of the wavy instability, which are absent in Newtonian fluids.

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Taylor-Couette flow of shear-thinning fluids

Cagney

Balabani

2019

Physics of Fluids

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Numerical Investigation Of Non-Newtonians Fluids Flows Between Two Rotating Cylinders Using Lattice Boltzmann Method

Cited by 1 publication

References 10 publications

Taylor-Couette flow of shear-thinning fluids

Taylor-Couette flow of shear-thinning fluids

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