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Acoustic trapping of particles in a capillary tube using a flexural acoustic wave was studied both theoretically and experimentally. Acoustic force potential was calculated using numerical simulation based on the finite element method. The distribution of particles which resulted from the force potential was categorized into four cases, depending on the physical properties of particles and fluid. Acoustic trapping was demonstrated using a robust, compact acoustic transducer, providing arbitrary interaction length. Theoretical estimation was successfully confirmed experimentally.

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