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Effect of the input power We on the mixing enhancement, approximated as the ratio of the effective diffusivity Deff to the diffusivity due to pure diffusional mixing D0 in the absence of SAW-driven convection. Four different conditions were examined: fm = 0 (without modulation) (◇), fm = 1 kHz (×), fm = 5 kHz (●), and fm = 15 kHz (△).
