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Schematic of a microchannel with a HSS in the center. Region 1, external to the HSS, is filled by a liquid (e.g., water) and region 2, inside the HSS, is occupied by air. The dimensions of the HSS (a, b, and h) and the amplitude of the water-air interface (S) are labeled in the figure. A piezoelectric transducer is used for acoustic activation of the bubble trapped at the HSS.
