Near-wall motion of inertial particles in a drag-reduced non-Newtonian turbulent flow

Ebrahimian, M.; Sanders, R. Sean; Ghaemi, Sina

doi:10.1007/s00348-019-2764-8

Cited by 6 publications

(2 citation statements)

References 62 publications

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“…The extent of such laminarization expands in the x-y plane as a dominating effect of the polymer additives, which has been well-known to restructure the flow energetics. 14,19,55 As noted in the discussion for Figure 8, previous findings 13,15,53,56 documented that the polymer additives make the flow more parallel with the streamwise direction with increasing DR.…”

Section: Polymeric Two-point Correlationsmentioning

confidence: 66%

Modification of turbulent boundary layer coherent structures with drag reducing polymer solution

et al. 2020

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The modification of coherent structures within the log-region of a drag reduced turbulent boundary layer is studied via examination of two-point correlations from time-resolved particle-imagevelocimetry. Measurements were acquired in polymer oceans (uniform concentration) at drag reduction levels corresponding to the low drag reduction regime (< 40%), the high drag reduction (HDR) regime (>40%), and at an intermediate level (~40%). The mean velocity profiles and twopoint correlations were compared with that of water (Newtonian, DR = 0%). These results show that with increasing drag reduction the inclination of the coherent structures decrease, the streamwise extent increases, and the fluctuations in the correlations are suppressed (especially at HDR). These observations are examined in comparison with the coherent structure literature (Newtonian and polymeric).

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Section: Polymeric Two-point Correlationsmentioning

confidence: 66%

Modification of turbulent boundary layer coherent structures with drag reducing polymer solution

et al. 2020

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“…It was shown that addition of certain amount of polymers in order of parts per million (ppm) efficiently reduces drag. In a similar research, Ebrahimian et al (2019) studied motion of suspended inertial particles near wall in a non-Newtonian turbulent channel flow. It is revealed that 90 ppm solution of polyacrylamide in water reduces drag by 66%.…”

Section: Literaturementioning

confidence: 99%

In the road of assessing the validity of logarithmic law in wake flows: A review

Sabzpoushan¹

2020

J. Mech. Eng. Res.

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In any application of wall-bounded or shear fluid flows, near-wall boundary layer and shear layer are the places of struggle between viscous and inertial forces. After development and spread of using wall functions for modeling near-wall region of boundary layer in wall-bounded turbulent flows, the importance of accurate prediction and modeling of different layers of boundary layer, particularly the so-called logarithmic layer becomes more crucial in aerodynamics. Due to the intrinsic characteristics of flow structure in log-layer and widespread applications of wake flows, the presence of these characteristics in wake flows rather than wall-bounded flows opens a new window to the researchers to investigate the possibility of using log-law within wake regions, particularly on wake centerline for modeling purposes. On the applications of wake modeling and studying, we can point out to wing and blade trailing edge design, exhaust flow of pipes and ducts (e.g. nozzle exhaust or internal flow of polymers in dimpled pipes), and vortex generator design which are just a few examples of the areas with great interest in both fundamental scientific research, that is, developing optimum and accurate Computational Fluid Dynamics (CFD) tools and their industrial applications. In this article, a brief description about different approaches, previous efforts and case studies, and similar analogous problems is presented to give a better perception to the future researchers.

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Speed dependence of integrated drag reduction in turbulent flow with polymer injection

Ren

Xie

et al. 2021

Exp Fluids

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Near-wall motion of inertial particles in a drag-reduced non-Newtonian turbulent flow

Cited by 6 publications

References 62 publications

Modification of turbulent boundary layer coherent structures with drag reducing polymer solution

Modification of turbulent boundary layer coherent structures with drag reducing polymer solution

In the road of assessing the validity of logarithmic law in wake flows: A review

Speed dependence of integrated drag reduction in turbulent flow with polymer injection

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