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dc.contributor.authorWiederkehr, R. S.-
dc.contributor.authorSalvadori, M. C.-
dc.contributor.authorDegasperi, F. T.-
dc.contributor.authorCattani, M.-
dc.identifier.citationJournal of Physics: Conference Series, v. 100, n. PART 5, 2008.-
dc.description.abstractThis work describes a fabrication and test sequence of microvalves installed on micronozzles. The technique used to fabricate the micronozzles was powder blasting. The microvalves are actuators made from PVDF (polivinylidene fluoride), that is a piezoelectric polymer. The micronozzles have convergent-divergent shape with external diameter of 1mm and throat around 230μm. The polymer have low piezoelectric coefficient, for this reason a bimorph structure with dimensions of 2mm width and 4mm of length was build (two piezoelectric sheets were glued together with opposite polarization). Both sheets are recovered with a conductor thin film used as electrodes. Applying a voltage between the electrodes one sheet expands while the other contracts and this generate a vertical movement to the entire actuator. Appling +300V DC between the electrodes the volume flux rate, for a pressure ratio of 0.5, was 0.36 sccm. Applying -200V DC between the electrodes (that means it closed) the volume flux rate was 0.32 sccm, defining a possible range of flow between 0.32 and 0.36 sccm. The third measurement was performed using AC voltage (200V AC with frequency of 1Hz), where the actuator was oscillating. For pressure ratio of 0.5, the flow rate was 0.62 sccm. © 2008 IOP Publishing Ltd.en
dc.subjectAc voltage-
dc.subjectGas flow control-
dc.subjectMicro nozzle-
dc.subjectMicro valves-
dc.subjectPiezoelectric coefficient-
dc.subjectPiezoelectric polymers-
dc.subjectPiezoelectric sheets-
dc.subjectPowder blastings-
dc.subjectPressure ratio-
dc.subjectTest sequence-
dc.subjectVertical movement-
dc.subjectVolume flux-
dc.subjectValves (mechanical)-
dc.subjectPiezoelectric actuators-
dc.titleDevelopment of microvalves for gas flow control in micronozzles using PVDF piezoelectric polymeren
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationInstitute of Physics University of São Paulo, CP 66318, CEP 05315-970, São Paulo, SP-
dc.description.affiliationFaculdade de Tecnologia de São Paulo Centro Estadual de Educação Tecnológica Paula Souza CEETEPS - UNESP, São Paulo, SP-
dc.description.affiliationUnespFaculdade de Tecnologia de São Paulo Centro Estadual de Educação Tecnológica Paula Souza CEETEPS - UNESP, São Paulo, SP-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Physics: Conference Series-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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