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Dynamics of bubble deformation and breakup in decaying isotropic turbulence
Phys. Rev. Fluids 9, 123604 – Published 23 December, 2024
DOI: https://doi.org/10.1103/PhysRevFluids.9.123604
Abstract
Two-phase flows involving the dynamic interaction of gas and liquid phases are fundamental to both natural and industrial systems. A critical phenomenon in these flows is bubble fragmentation, which affects interfacial area and mass/momentum transfer. Direct numerical simulations (DNS) of turbulent two-phase bubbly flows allow for improved control of physical parameters and access to local flow variables that are challenging to obtain from traditional experiments. In this work, we perform numerical experiments of bubble breakup in decaying isotropic turbulence, at moderate Weber number regimes. By analyzing the interfacial strain rate and turbulent kinetic energy exchange, we provide new insights into the interplay between turbulence and bubble breakup dynamics. Different bubble sizes around the integral scale are simulated for a fixed bubble Weber number, which defines the ratio of turbulent and surface tension forces, maintaining the level of deformability. Results reveal that bubbles closest to the turbulence integral scale have the highest deformation levels and are most efficient in extracting energy from the flow. Smaller bubbles show the least amount of deformation and are unable to capture energy from the larger eddies, in agreement with the Kolmogorov-Hinze hypothesis.
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