Laminar transitional and turbulent flow of yield stress fluid in a pipe

Peixinho, Jorge; Nouar, Chérif; Desaubry, C.; Théron, B.

doi:10.1016/j.jnnfm.2005.03.008

Cited by 110 publications

(133 citation statements)

References 22 publications

(50 reference statements)

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“…Asymmetry in transitional pipe flow of viscoelastic, shearthinning polymers, including those exhibiting a yield stress has been well documented by several investigators [2,3,7,8,12] since it was first observed just over a decade ago [1] and the existence of this phenomenon is now incontrovertible. Although the present study is the most systematic and extensive to date, it has not led to an explanation of the physical mechanism which triggers the asymmetry.…”

Section: Discussionmentioning

confidence: 92%

“…Subsequently [2,3] it became apparent that such velocityprofile asymmetry was evident for a wide range of drag-reducing (shear-thinning and viscoelastic) polymer solutions: xanthan gum, polyacrylamide, and CMC, and also for Carbopol [3], a shearthinning, yield-stress fluid. Unless intentionally provoked, for example by an imposed asymmetric disturbance upstream [4], the time-averaged velocity profiles for fully developed transitional pipe flow of Newtonian fluids invariably are found to be axisymmetric within experimental uncertainty (see e.g.…”

Section: Introductionmentioning

confidence: 99%

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Asymmetry in transitional pipe flow of drag-reducing polymer solutions

Escudier

Rosa

Poole

2009

Journal of Non-Newtonian Fluid Mechanics

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a b s t r a c tNew experimental data are presented and discussed for fully developed pipe flow of shear-thinning, viscoelastic polymer solutions in the transitional regime between laminar and turbulent flow. The data confirm that such transitional flows exhibit significant departures from axisymmetry in contrast to the fully developed pipe flow of Newtonian fluids or both laminar and turbulent flows of such drag-reducing liquids. The azimuthal structure of the asymmetry is investigated together with its axial development and also the velocity fluctuation levels. These data do not lead to an explanation for the asymmetry but do suggest that the influence of the flow geometry both upstream and downstream can be ruled out.

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Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Asymmetry in transitional pipe flow of drag-reducing polymer solutions

Escudier

Rosa

Poole

2009

Journal of Non-Newtonian Fluid Mechanics

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“…The parabolic shape of the opal fronts resembles turbulent non-Newtonian flow velocity profiles [23] and indicates a strong coupling between colloid flow and structural ordering. This observation agrees well with non-Newtonian fluid flow textures preserved in vein opals in previous studies [1,11].…”

Section: Flow-induced Orderingmentioning

confidence: 86%

Silica Colloid Ordering in a Dynamic Sedimentary Environment

Liesegang

Milke

2018

Minerals

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The formation of ordered particle arrays plays an essential role in nanotechnology, biological systems, and inorganic photonic structures in the geosphere. Here, we show how ordered arrays of amorphous silica spheres form in deeply weathered lithologies of the Great Artesian Basin (central Australia). Our multi-method approach, using optical and scanning electron microscopy, X-ray microdiffraction, Raman spectroscopy, and electron probe microanalysis, reveals that particle morphologies trace the flow of opal-forming colloidal suspensions and document syn-and post-depositional deformation. The micromorphology of amorphous silica pseudomorphs suggests that the volume-preserving replacement of non-silicate minerals proceeds via an interface-coupled dissolution precipitation process. We conclude that colloid flow and post-depositional shearing create but also destroy natural photonic crystals. Contrary to previous studies, our results indicate that purely gravitational settling/ordering is the exception rather than the rule during the formation of three-dimensional periodic sphere arrays in the highly dynamic colloidal suspensions of chemically weathered clastic sediments.

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“…It is very obvious that the experimental measurements are in agreement with the generalized Hagen-Poiseuille law (f = 16/Re g ) for the different concentration slurries. Moreover, it is interesting found that the laminar transitional is delayed and it may be due to the increased effective viscosity which is induced by particles and fluids interaction [26][27][28].…”

Section: Rheological Propertiesmentioning

confidence: 99%