Turbulence modulation in buoyancy-driven bubbly flows

Pandey, Vikash; Mitra, Dhrubaditya; Perlekar, Prasad

doi:10.1017/jfm.2021.942

Cited by 5 publications

(3 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Buoyancy injects energy at scales comparable to the bubble diameter; it is then transferred to smaller scales by non-linear fluxes due to surface tension and kinetic energy, where it gets dissipated by viscosity. Quite remarkably, these studies also reveal that the statistics of the velocity fluctuations do not depend either on the viscosity or density contrast [6,11,12].…”

Section: Introductionmentioning

confidence: 92%

“…We choose parameters such that the dimensionless numbers (Ga, Bo, H/d, and ϕ) are comparable to experiments [15,17,18]. We simulate low At = 0.08 and high At = 0.9, and verify that the spectral properties are insensitive to density contrast [6,11,12].…”

Section: Initial Conditions and Parametersmentioning

confidence: 97%

“…Only recent numerical studies have started investigating pseudo-turbulence at experimentally relevant parameter ranges [6,10,11]. A scale-by-scale energy budget analysis has unraveled the details of the energy transfer mechanism.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Energy spectra of buoyancy-driven bubbly flow in a vertical Hele-Shaw cell

2023

Self Cite

View full text Add to dashboard Cite

We present direct numerical simulations (DNS) study of confined buoyancy-driven bubbly flows in a Hele-Shaw setup. We investigate the spectral properties of the flow and make comparisons with experiments. The energy spectrum obtained from the gap-averaged velocity field shows E(k) ∼ k for k < kd, E(k) ∼ k−5 for k > kd, and an intermediate scaling range with E(k) ∼ k−3 around k ∼ kd. We perform an energy budget analysis to understand the dominant balances and explain the observed scaling behavior. For k < kd, energy injection balances dissipation due to drag, whereas for k > kd, the net injection balances net dissipation. We also show that the Navier-Stokes equation with a linear drag can be used to approximate large scale flow properties of bubbly Hele-Shaw flow.

show abstract

Section: Introductionmentioning

confidence: 92%

Section: Initial Conditions and Parametersmentioning

confidence: 97%

See 1 more Smart Citation

Energy spectra of buoyancy-driven bubbly flow in a vertical Hele-Shaw cell

2023

Self Cite

View full text Add to dashboard Cite

show abstract

Spectral analysis of dispersed multiphase flows in the presence of fluid interfaces

Ramirez,

Burlot,

Zamansky

et al. 2024

International Journal of Multiphase Flow

View full text Add to dashboard Cite

Numerical study on turbulence modulation of finite-size particles in plane-Couette flow

Wang,

Jiang,

Sun

2023

J. Fluid Mech.

View full text Add to dashboard Cite

Turbulent plane-Couette flow suspended with finite-size spheroidal particles is studied using fully particle-resolved direct numerical simulations. The effects of particle aspect ratio on turbulent arguments and particle statistics are explored, leading to the same conclusions as the previous experimental findings (Wang et al., J. Fluid Mech., vol. 937, 2022, A15). By performing stress analysis, we find that the presence of particles introduces extra stresses to the system and accounts for the global drag increases. The particle-laden flow cases exhibit spectra that are consistent with the scalings $k^{-5/3}$ and $k^{-3}$ in the large and small scales, respectively. While the $k^{-3}$ scaling observed in the particle-laden flow is reminiscent of bubbly flow, an examination of the particle Reynolds number suggests that the mechanism responsible may not be attributable to the pseudo-turbulence induced by particles as in the case of bubbles. In the view of particle statistics, we observe that spherical and non-spherical particles cluster preferentially in the near-wall and the bulk region, respectively, and that the orientations of non-spherical particles are affected by their aspect ratios, especially in the near-wall region. The present numerical results, combined with previous experimental findings in Wang et al. (J. Fluid Mech., vol. 937, 2022, A15), provide in-depth information on both the fluid and the particle phase, contributing to a better understanding of particle suspension in shear flows.

show abstract

Turbulence modulation in buoyancy-driven bubbly flows

Cited by 5 publications

References 50 publications

Energy spectra of buoyancy-driven bubbly flow in a vertical Hele-Shaw cell

Energy spectra of buoyancy-driven bubbly flow in a vertical Hele-Shaw cell

Spectral analysis of dispersed multiphase flows in the presence of fluid interfaces

Numerical study on turbulence modulation of finite-size particles in plane-Couette flow

Contact Info

Product

Resources

About