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Micromachines 2014, 5(3), 654-666;

Effect of β-PVDF Piezoelectric Transducers’ Positioning on the Acoustic Streaming Flows

Transport Phenomena Research Center, Department of Chemical Engineering, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
Centro Algoritmi, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
Author to whom correspondence should be addressed.
Received: 17 July 2014 / Revised: 24 July 2014 / Accepted: 6 August 2014 / Published: 1 September 2014
(This article belongs to the Special Issue Micromixer & Micromixing)
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This paper reports the numerical and experimental analysis of the acoustic streaming effect in a fluidic domain. The actuation of a piezoelectric transducer generates acoustic waves that propagate to the fluids, generating pressure gradients that induce the flow. The number and positioning of the transducers affect the pressure gradients and, consequently, the resultant flow profile. Two actuation conditions were considered: (1) acoustic streaming generated by a 28 μm thick β-poly(vinylidene fluoride) (β-PVDF) piezoelectric transducer placed asymmetrically relative to the fluidic domain and (2) acoustic streaming generated by two 28 μm thick β-PVDF piezoelectric transducers placed perpendicularly to each other. The transducers were fixed to the lower left corner of a poly(methyl methacrylate) (PMMA)cuvette and were actuated with a 24 Vpp and 34.2 MHz sinusoidal voltage. The results show that the number of transducers and their positioning affects the shape and number of recirculation areas in the acoustic streaming flows. The obtained global flows show great potential for mixing and pumping, being an alternative to the previous geometries studied by the authors, namely, a single transducer placed symmetrically under a fluidic domain. View Full-Text
Keywords: PVDF; piezoelectricity; acoustic streaming; mixing PVDF; piezoelectricity; acoustic streaming; mixing

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Catarino, S.O.; Miranda, J.M.; Minas, G. Effect of β-PVDF Piezoelectric Transducers’ Positioning on the Acoustic Streaming Flows. Micromachines 2014, 5, 654-666.

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