Spatial structure and velocity fluctuations in turbulent bubble jets in microgravity
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hdl:2117/10022
Tipus de documentText en actes de congrés
Data publicació2009
Condicions d'accésAccés obert
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Abstract
We study the dynamics of turbulent jets of bubbles created
by the injection of a slug flow into a quiescent cavity, both
theoretically and experimentally using data from drop tower
experiments. The generated bubble jets exhibit a remarkably
low degree of coalescence leading to virtually monodisperse
suspensions of spherical bubbles. The turbulence of the jet is
responsible for the spatial spreading of the bubble distribution
in roughly conical jets. We propose a stochastic model for the
dispersion of bubbles in the jet, in which the trajectories of individual
bubbles can be computed from the stationary solution
of a k-epsilon model. Bubble concentration behaves to a good
approximation as a passive scalar with a non-homogeneous
diffusion. Numerical integration of the model compares well
with the experimental data.
CitacióBitlloch, P. [et al.]. Spatial structure and velocity fluctuations in turbulent bubble jets in microgravity. A: Interdisciplinary Transport Phenomena Conference. "Sixth Interdisciplinary Transport Phenomena Conference: Fluid, Thermal, Biological, Materials and Space Sciences". Volterra: 2009, p. 1-6.
Versió de l'editorhttp://ame-www.usc.edu/cf/Volterra2009/PROGRAM/PAPERS/Paper-49.pdf
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