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dc.contributor.authorLeslie, Brian Roberten_US
dc.date.accessioned2013-02-19T22:35:24Z
dc.date.available2013-02-19T22:35:24Z
dc.date.issued2012-12-07en_US
dc.identifier.othervt_gsexam:26en_US
dc.identifier.urihttp://hdl.handle.net/10919/19199
dc.description.abstractAccurate measurement of skin friction in complex flows is important for: documentation and monitoring of fluid system performance, input information for flow control, development of turbulence models and CFD validation. The goal of this study was to explore using new materials to directly measure skin friction in a more convenient way than available devices. Conventional direct measurement skin friction sensors currently in use are intrusive, requiring movable surface elements with gaps surrounding that surface, or require optical access for measurements. Conventional direct measurement sensors are also difficult to apply in low shear environments, in the 1-10 Pa range. A new thin, flexible, nanoparticle infused, piezoresistive material called Metal Rubber" was used to create sensors that can be applied to any surface. This was accomplished by using modern computerized finite element model multiphysics simulations of the material response to surface shear loads, in order to design a sensor configuration with a reduced footprint, minimal cross influence and increased sensitivity. These sensors were then built, calibrated in a fully-developed water channel flow and tested in both the NASA 20x28 inch Shear Flow Control Tunnel and a backwards facing step water flow. The results from these tests showed accurate responses, with no amplification to the sensor output, to shear levels in the range of 1-15 Pa. In addition, the computer model of these sensors was found to be useful for studying and developing refined sensor designs and for documenting sources of measurement uncertainty. These encouraging results demonstrate the potential of this material for skin friction sensor applications.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectAerospaceen_US
dc.subjectFluid Dynamicsen_US
dc.subjectSkin Frictionen_US
dc.subjectSensoren_US
dc.subjectInstrumentationen_US
dc.subjectCFDen_US
dc.subjectFEMen_US
dc.subjectTurbulenten_US
dc.subjectDesignen_US
dc.titleDesign, Analysis, and Testing of Nanoparticle-Infused Thin Film Sensors for Low Skin Friction Applicationsen_US
dc.typeDissertationen_US
dc.contributor.departmentAerospace and Ocean Engineeringen_US
dc.description.degreePHDen_US
thesis.degree.namePHDen_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineAerospace Engineeringen_US
dc.contributor.committeechairSchetz, Joseph Aen_US
dc.contributor.committeememberPhilen, Michael Keithen_US
dc.contributor.committeememberSeidel, Gary Den_US
dc.contributor.committeememberClaus, Richard Oen_US


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