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In this paper, experiments and numerical simulations have been conducted to investigate the flow characteristics in the flat-walled micro-diffuser/nozzle on conditions of angle (0°–60°), Reynolds number (100–1500) and excitation frequency (0–5000 Hz). In steady flow, the diffuser efficiency increases with an increase in Reynolds number as θ ≤ 10°, but the optimal diffuser efficiency is found as 20° ≤ ...