Abstract
The rising speed and dissolution rate of a carbon dioxide bubble
in slightly
contaminated water were investigated experimentally and numerically. We
developed an
experimental system that uses a charged-coupled device (CCD) camera coupled
with
a microscope to track the rising bubble. By precisely measuring the bubble
size and
rising speed, we were able to accurately estimate the drag coefficient
and the Sherwood
number for the dissolution rate of gas bubbles at Reynolds numbers below
100
in the transient regime, where the bubble changes from behaving as a fluid
sphere
to behaving as a solid particle. We also numerically estimated the drag
coefficient
and Sherwood number of the ‘stagnant cap model’ by directly
solving the coupled
Navier–Stokes and convection–diffusion equations. We compared
our experimental
results with our numerical results and proposed equations for estimating
the drag
coefficient and Sherwood number of the bubble affected by contamination
and clarified
that the gas–liquid interface of the carbon dioxide bubble in water
is immobile. We
also show that the experimental and numerical results are in good agreement
and the
stagnant cap model can explain the mechanism of the transient process where
the
bubble behaviour changes from that of a fluid sphere to that of a solid
particle.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
95 articles.
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