Turbulence modulation by finite-size spherical particles in Newtonian and viscoelastic fluids

Zade, Sagar; Lundell, Fredrik; Brandt, Luca

doi:10.1016/j.ijmultiphaseflow.2018.12.015

Cited by 14 publications

(10 citation statements)

References 57 publications

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“…The particles enhance the overall drag in the Newtonian and viscoelastic flows, relative to the single-phase configurations. The drag increase is, however, more appreciable in the viscoelastic cases; a similar observation was made based on the recent experimental measurements by Zade et al (2019). The present simulations demonstrate that a significant contribution is due to the particles increasing the polymer stress by stretching the polymer chains in their vicinity.…”

Section: Resultssupporting

confidence: 90%

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Dilute suspension of neutrally buoyant particles in viscoelastic turbulent channel flow

Esteghamatian

Zaki

2019

J. Fluid Mech.

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Direct numerical simulations of viscoelastic turbulent channel flow laden with neutrally buoyant spherical particles are performed. Two FENE-P viscoelastic and one Newtonian fluid are examined, and for each the particle-laden configuration is contrasted to a reference condition without seeding. The size of the particles is larger than the dissipation length scale, and their presence enhances drag in a manner that is intrinsically different in the viscoelastic and Newtonian flows. While the particles effectively suppress the turbulence activity, they significantly enhance the polymer stresses. The polymer chains are markedly stretched in the vicinity of the particles, altering the correlation between the turbulence and polymer work that is commonly observed in single-phase viscoelastic turbulence. At the lower elasticity, the particles enhance the cycle of hibernating and active turbulence and, in turn, their migration and volume-fraction profiles are qualitatively altered by the intermittency of the turbulence. Particle–fluid momentum transfer is investigated by estimating the local fluid field on a trimmed spherical shell around the individual particles. And by comparing the particle microstructures, a lower probability of particle alignment in the streamwise direction is observed in the viscoelastic configuration. This effect is attributed to a qualitative difference in the conditionally averaged velocity fields in the vicinity of the particles in the Newtonian and viscoelastic flows.

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Section: Resultssupporting

confidence: 90%

“…2013). Very recently, Zade, Lundell & Brandt (2019) experimentally contrasted the particle–turbulence interactions in a duct flow in both Newtonian and viscoelastic conditions. They reported that the viscoelastic drag reduction is less effective in the presence of particles and attributed this effect to the increased particle stresses.…”

Section: Introductionmentioning

confidence: 99%

Dilute suspension of neutrally buoyant particles in viscoelastic turbulent channel flow

Esteghamatian

Zaki

2019

J. Fluid Mech.

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“…For all but one of the non-coalescing droplet runs plotted in figure 5, ⟨ ⟩ has a local maximum near the wall, in the region 0.15 < < 0.3 . This phenomenon is similar to "wall layering", which has been extensively observed for rigid particles and bubbles in wall bounded flows (Takagi, Ogasawara, and Matsumoto, 2008;Yeo and Maxey, 2010;Zade, Lundell, and Brandt, 2019;Ahmed et al, 2020b). Notably Picano, Breugem, and Brandt (2015) made simulations of particles in Couette flow and found that lubrication forces stabilize a layer of particles next to the walls.…”

Section: Resultssupporting

confidence: 70%

The effect of droplet coalescence on drag in turbulent channel flows

Cannon,

Izbassarov,

Tammisola

et al. 2021

Preprint

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We study the effect of droplet coalescence on turbulent wall-bounded flows, by means of direct numerical simulations. In particular, the volume-of-fluid and front-tracking methods are used to simulate turbulent channel flows containing coalescing and non-coalescing droplets, respectively. We find that coalescing droplets have a negligible effect on the drag, whereas the non-coalescing ones steadily increase drag as the volume fraction of the dispersed phase increases: indeed, at 10% volume fraction, the non-coalescing droplets show a 30% increase in drag, whereas the coalescing droplets show less than 4% increase. We explain this by looking at the wall-normal location of droplets in the channel and show that non-coalescing droplets enter the viscous sublayer, generating an interfacial shear stress which reduces the budget for viscous stress in the channel. On the other hand, coalescing droplets migrate towards the bulk of the channel forming large aggregates, which hardly affect the viscous shear stress while damping the Reynolds shear stress. We prove this by relating the mean viscous shear stress integrated in the wall-normal direction to the centreline velocity.

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“…Numerous experiments have been reported on turbulence modulation in gas-solid flows (Lee & Durst 1982;Tsuji & Morikawa 1982;Tsuji, Morikawa & Shiomi 1984;Parthasarathy & Faeth 1990;Schreck & Kleis 1993;Kulick, Fessler & Eaton 1994;Petersen, Baker & Coletti 2019;Zhu et al 2019) and liquid-solid flows (Sato & Hishida 1996;Suzuki, Ikenoya & Kasagi 2000;Kiger & Pan 2002;Kussin & Sommerfeld 2002;Hosokawa & Tomiyama 2004, 2009Bellani et al 2012;Shokri et al 2017;Zade, Lundell & Brandt 2019;Mena & Curtis 2020). It has been recognized that small particles tend to attenuate the turbulence, whereas large particles enhance the turbulence (Tsuji & Morikawa 1982;Tsuji et al 1984;Gore & Crowe 1989).…”

Section: Introductionmentioning

confidence: 99%

Modulation of turbulence intensity by heavy finite-size particles in upward channel flow

Xia

Guo

et al. 2021

J. Fluid Mech.

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Turbulence modulation by finite-size spherical particles in Newtonian and viscoelastic fluids

Cited by 14 publications

References 57 publications

Dilute suspension of neutrally buoyant particles in viscoelastic turbulent channel flow

Dilute suspension of neutrally buoyant particles in viscoelastic turbulent channel flow

The effect of droplet coalescence on drag in turbulent channel flows

Modulation of turbulence intensity by heavy finite-size particles in upward channel flow

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