Flow of yield stress materials through annular abrupt expansion–contractions

Varges, Priscilla R.; Fonseca, B. Sena da; Mendes, Paulo R. de Souza; Naccache, Mônica F.; Miranda, C.R.

doi:10.1063/5.0015400

Cited by 12 publications

(2 citation statements)

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“…The unyielded region was found near the channel wall of the larger diameter portion with the size being a strong function of the geometrical, rheological, and flow parameters. Later, Varges et al [ 64 ] presented an experimental study of the inertialess flow of Carbopol aqueous dispersions through annular abrupt expansions–contractions. Their observed flow patterns reveal both yielded and unyielded regions, where the yield surfaces were found to exhibit a fore-aft asymmetry in all tests because of the elastic effects.…”

Section: Introductionmentioning

confidence: 99%

“…To date, however, no work has been reported on the flow of fluids with varying rheological properties through the same cavity microchannel, thus providing a basis for a direct comparison amongst different flow parameters. Moreover, nearly none of the reported works [ 63 , 64 , 65 , 66 , 67 , 68 , 69 ] have emphasized the effect of confinement along the primary flow direction that is imposed by the expansion and contraction. Especially looking at the heavy geometric dependence of the non-Newtonian flow instabilities through the existing works mentioned above, it is essential to underline how the flow pattern in a confined geometry differs from the unconfined flow reported in single contraction and/or expansion microchannels [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ].…”

Section: Introductionmentioning

confidence: 99%

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Flow of Non-Newtonian Fluids in a Single-Cavity Microchannel

Raihan

Jagdale

et al. 2021

Micromachines

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Having a basic understanding of non-Newtonian fluid flow through porous media, which usually consist of series of expansions and contractions, is of importance for enhanced oil recovery, groundwater remediation, microfluidic particle manipulation, etc. The flow in contraction and/or expansion microchannel is unbounded in the primary direction and has been widely studied before. In contrast, there has been very little work on the understanding of such flow in an expansion–contraction microchannel with a confined cavity. We investigate the flow of five types of non-Newtonian fluids with distinct rheological properties and water through a planar single-cavity microchannel. All fluids are tested in a similarly wide range of flow rates, from which the observed flow regimes and vortex development are summarized in the same dimensionless parameter spaces for a unified understanding of the effects of fluid inertia, shear thinning, and elasticity as well as confinement. Our results indicate that fluid inertia is responsible for developing vortices in the expansion flow, which is trivially affected by the confinement. Fluid shear thinning causes flow separations on the contraction walls, and the interplay between the effects of shear thinning and inertia is dictated by the confinement. Fluid elasticity introduces instability and asymmetry to the contraction flow of polymers with long chains while suppressing the fluid inertia-induced expansion flow vortices. However, the formation and fluctuation of such elasto-inertial fluid vortices exhibit strong digressions from the unconfined flow pattern in a contraction–expansion microchannel of similar dimensions.

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Section: Introductionmentioning

confidence: 99%