Abstract
Bubble cycles, including initiation, growth and departure, are thephysical basis of nucleate boiling. The present investigation, however,reveals unusual bubble motions during subcooled nucleate boiling onmicrowires 25 or 100 μm in diameter. Two types of bubble motions,bubble sweeping and bubble return, are observed in the experiments.Bubble sweeping describes a bubble moving back and forth along thewire, which is motion parallel to the wire. Bubble return is the bubblemoving back to the wire after it has detached or leaping above thewire. Theoretical analyses and numerical simulations are conducted toinvestigate the driving mechanisms for both bubble sweeping and return.Marangoni flow from warm to cool regions along the bubble interface isfound to produce the shear stresses needed to drive these unusualbubble movements.
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