Laboratory
experiments
(silicone oil 12.5
Pa.s,
tube diameter =
0.14 m)
Direct measurements (14): Acoustic records
Bubble vibration model:
bubble arrives at the surface of
lava column with an overpressure DP
Sketch of
bubble
vibration model
Bubble grows and pass
equilibrium position with non-zero velocity:
bubble overshoot, so the bubble
become larger than equilibrium
has a pression less than
equilibrium. Gas compressibility acts to
restore the equilibrium
pressure, so bubble shrinks.
bubble oscillations