Author:
MARTÍNEZ-BAZÁN C.,MONTAÑÉS J. L.,LASHERAS J. C.
Abstract
The transient evolution of the bubble-size probability density functions resulting
from the breakup of an air bubble injected into a fully developed turbulent water
ow has been measured experimentally using phase Doppler particle sizing (PDPA)
and image processing techniques. These measurements were used to determine the
breakup frequency of the bubbles as a function of their size and of the critical
diameter Dc defined as Dc =
1.26 (σ/ρ)3/5ε−2/5, where ε is the
rate of dissipation per unit mass and per unit time of the underlying turbulence. A
phenomenological model is proposed showing the existence of two distinct bubble size regimes.
For bubbles of sizes comparable to Dc, the breakup frequency is shown to increase as
(σ/ρ)−2/5ε−3/5
√D/Dc−1, while for large bubbles whose
sizes are greater than 1.63Dc, it decreases with the bubble size as
ε1/3D−2/3. The model is shown to be in good
agreement with measurements performed over a wide range of bubble sizes and turbulence
intensities.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
356 articles.
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