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(a) Cross-sectional sketch of the SAW-driven device consisting of a lithium niobate substrate and liquid-filled PDMS channel (width w = 600 μm and height h = 125 μm). The substrate is acoustically actuated via two sets of interdigitated electrodes (IDTs). Note, the figure is not drawn to scale and that the PDMS channel walls are considered to be of thickness 2 mm or greater. (b) Sketch of the computational domain Ω with impedance boundaries Γi and Dirichlet actuation boundary Γd.
