A theoretical study on using PVDF in the acoustic micropump for biomedical applications
Keywords:Biomedical engineering, Microsystems, Pressure effects, Pumps, Pressure fluctuation, PVDF films, Vibrational displacement
AbstractTheoretical description to prove that PVDF (Polyvinylidene fluoride), in bimorph configuration, is an appropriate material as an actuator in the acoustic micropump is discussed. PZT actuation is promising due to its simple structure, high output power density and high actuation strength. The pumping action of the acoustic micropump is related to the maximum pressure fluctuation inside the pump chamber. Larger value of maximum vibrational displacements required to achieve higher pressure fluctuation. The maximum thickness of commercially available PVDF films is limited to 110 ?m, and even for large value of excitation voltage the change in thickness of a single layer of PVDF film is not sufficiently large to produce enough vibrational displacement to excite high-amplitude standing wave inside the micropump chamber.
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