| The anomalous wake accompanying a penny-shaped air
bubble of diameter 8 cm rising through a thin gap of water bound between
glass plates inclined at 3 degrees relative to the horizontal. The image
on the left is a schematic of the flow, and that on the right is a digitized
image indicating the motion of particles suspended in the flow in the bubble
frame of reference. Note the vigorous reversed surface flow and the bounding
streamline, both of which are reminiscent of thermocapillary bubble motion
in microgravity. A physical explanation and theoretical model of this peculiar
flow structure is given in Bush
(1997). |
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