Abstract
A homogenous swarm of bubbles rising through a liquid generates anisotropic homogeneous random velocity fluctuations. The statistical properties of bubble-induced fluctuations differ from the classical shear-induced turbulence. The probability density functions are non Gaussian and show a succession of exponential evolutions. The power spectral densities exhibit a \(k^{-3}\) subrange for wavelengths around the bubble size. The understanding of these properties requires to consider that bubble-induced agitation involves two contributions of a different nature. The first one is not related to any flow instability and results from the anisotropic flow disturbances generated near the bubbles, principally in the vertical direction. The second one is the almost isotropic turbulence induced by the instability of the flow through a population of bubbles, which turns out to be the main cause of horizontal fluctuations. Even if the two contributions are coupled, only the second one deserves to be called bubble-induced turbulence.
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Risso, F. (2019). Bubble-Induced Turbulence. In: Gorokhovski, M., Godeferd, F. (eds) Turbulent Cascades II. ERCOFTAC Series, vol 26. Springer, Cham. https://doi.org/10.1007/978-3-030-12547-9_20
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DOI: https://doi.org/10.1007/978-3-030-12547-9_20
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