Spectral Properties of Bubbly Turbulent Flows
Abstract
Suspension of deformable bubbles are ubiquitous in nature, their presence can dramatically alter the rheological properties of flows. We present a DNS study to investigate the spectral properties of the buoyancy-driven bubbly flows in the presence of large scale driving that generates turbulence. The non-dimensional Galilei (50 < Ga < 300) and Reynolds (50 < Re < 150) numbers characterize the flow. Consistent with the experiments, we show that the energy spectrum shows a pseudo-turbulence scaling (E (k) ~k-3) for length scales smaller than the bubble diameter and a Kolmogorov scaling (E (k) ~k - 5 / 3) for scales larger than the bubble diameter. We present a scale-by-scale energy budget analysis to unravel the dominant balances in different regimes.
- Publication:
-
APS Division of Fluid Dynamics Meeting Abstracts
- Pub Date:
- 2020
- Bibcode:
- 2020APS..DFDQ09004P