Experimental Study of Wall Shear Stress Modification by Surface Coating: Pressure Drop Measurements in a Rectangular Channel

dc.contributor.authorDominic, Justinen
dc.contributor.committeechairVlachos, Pavlos P.en
dc.contributor.committeecochairCharonko, John J.en
dc.contributor.committeememberDiller, Thomas E.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2017-04-04T19:49:18Zen
dc.date.adate2011-07-11en
dc.date.available2017-04-04T19:49:18Zen
dc.date.issued2011-05-31en
dc.date.rdate2016-09-27en
dc.date.sdate2011-06-10en
dc.description.abstractPresented in this paper are experiments to test the hypothesis that drag reduction is possible over hydrophobic surfaces in the Wenzel state during laminar and turbulent flows. Quantification of surface drag reduction in rectangular channel flow over walls with specific hydrophobic or hydrophilic properties was obtained with pressure drop measurements along the channel for a range of Reynolds numbers between 350 and 5900. Several commercially available materials and coatings were chosen in order to span a range of contact angles between 30° and 135°. The results are within the bounds of the theoretical values calculated with the Colebrook equation, and do not show any reduction in wall shear stress as a function of material properties or surface chemistry. The differences between this experiment and others measuring pressure drop over hydrophobic surfaces is the macro-scale conditions and the hydrophobic surfaces being fully wetted. These experiments are further proof of the importance of a liquid-vapor interface for increasing the shear free area to produce drag reduction.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-06102011-124812en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06102011-124812/en
dc.identifier.urihttp://hdl.handle.net/10919/76796en
dc.language.isoen_USen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectboundary layeren
dc.subjectdrag reductionen
dc.subjecthydrophobicityen
dc.subjectwettingen
dc.titleExperimental Study of Wall Shear Stress Modification by Surface Coating: Pressure Drop Measurements in a Rectangular Channelen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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