Patent ID: 8240907

Claim:
An apparatus for disturbing a liquid, the apparatus comprising: a channel having an inlet adapted to receive a liquid and an outlet adapted to discharge the liquid separate from the inlet; at least one piezoacoustic resonator element ( 11 ) having at least one piezoelectric layer ( 110 ) and two electrodes ( 111 , 112 ), which abut the piezoelectric layer ( 110 ), the piezoacoustic resonator element ( 11 ) being affixed to a first interior wall of the channel between the inlet and the outlet so that the at least one piezoelectric layer is exposed to the liquid in the channel and so that by applying a voltage to the piezoelectric layer ( 110 ) by means of the electrodes ( 111 , 112 ) a volume oscillation of the piezoelectric layer ( 110 ) is excited at resonant frequency and disturbs the liquid in the channel.