Abstract: The invention relates to a device (1) intended for handling objects (O) present in a channel (2) within a fluid (F), in particular a liquid. The device comprises: a channel (2) extending along a longitudinal axis (X), said channel (2) having a transverse section with a width (_) measured along a first transverse axis (Y) and a thickness measured along a second transverse axis (Z) perpendicular to the first, said width (_) being greater than or equal to the thickness, and said channel comprising first (3) and second (4) walls along the second transverse axis (Z); and an acoustic wave generator (10) generating acoustic waves in the channel from at least one of the walls (3; 4), said acoustic wave generator (10) operating at a frequency f that is different from a resonant frequency f0 of the channel (2) along the second transverse axis (Z).