Author:
BUNNER BERNARD,TRYGGVASON GRÉTAR
Abstract
Direct numerical simulations of the motion of up to 216 three-dimensional buoyant
bubbles in periodic domains are presented. The bubbles are nearly spherical and
have a rise Reynolds number of about 20. The void fraction ranges from 2% to
24%. Part 1 analysed the rise velocity and the microstructure of the bubbles. This
paper examines the fluctuation velocities and the dispersion of the bubbles and the
‘pseudo-turbulence’ of the liquid phase induced by the motion of the bubbles. It is
found that the turbulent kinetic energy increases with void fraction and scales with
the void fraction multiplied by the square of the average rise velocity of the bubbles.
The vertical Reynolds stress is greater than the horizontal Reynolds stress, but the
anisotropy decreases when the void fraction increases. The kinetic energy spectrum
follows a power law with a slope of approximately −3.6 at high wavenumbers.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
92 articles.
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