FOAM SUPRESSION WITH HYDROPHOBIC PARTICLES
size range = 600-850 µm
density = 2.65 g/cc
volume fraction = 10%
U liquid
= 0.2 cm/sec, U gas = 6.2 cm/sec
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Movie (3.4 MB)
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The bed of particles is better expanded under the
foam.
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Only 21% of the column has foamed.
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More of the hydrophobic particles penetrate the
foam.
When the flow is stopped:
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Movie (2.9 MB)
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Hydrophobic particles accumulate at the foam
interface.
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Particles trapped by the foam break in a particular
sequence in which the drier foam at the top breaks first.
More accumulation of particles at the interface is
observed when higher liquid or gas velocities are used as shown in the
following image:
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