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Heat transfer due to forced convection caused by acoustic streaming in microfluidic devices is shown to have potential in cooling effect. However, few studies are made for theoretically studying the fluid motion induced by the acoustic field and forced heat transfer for micro cooling in microdevices. In this paper, Navier-Stokes equations are first employed to study acoustic radiation force and acoustic...
Ultrasonic technique is proved to own higher efficiency than the traditional methods such as electroosmosis and electrohydrodynamic in driving and controlling fluid motion in microfluidic devices. However, few studies are done for theoretically studying the fluid motion induced by the acoustic field due to the complexity of the acoustic field and its induced flow field. In this paper, we present a...
In this paper, a PZT/Si composite transducer for resonant ultrasound spectroscope (RUS) is proposed, designed and fabricated. This composite transducer is made of a PZT piezoelectric disk, where a tiny silicon piece is adhered in its centre. For the silicon piece, a pyramid pit is fabricated by using MEMS technology. By using this composite transducer with a central pyramid pit, the tested sample...
In this paper a new microdevice for on-chip separation of microparticles is presented, in which a micromachined silicon nitride membrane structure is bonded with a glass substrate and then PZT plates are bonded to the silicon and glass substrates to excite the microdevice into vibration. Due to the energy coupling, silicon nitride membranes are excited into vibration as well, generating an ultrasonic...
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