A correlation of friction factors for pipe flow over two-dimensional, periodic geometric roughness

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dc.contributor.advisorWorley, Frank L., Jr.
dc.contributor.committeeMemberDukler, A. E.
dc.contributor.committeeMemberDalton, Charles
dc.contributor.committeeMemberFlumerfelt, Raymond W.
dc.contributor.committeeMemberHwang, Neddy H. C.
dc.creatorGaddis, Emerson Clifford, Jr.
dc.date.accessioned2023-01-17T17:15:12Z
dc.date.available2023-01-17T17:15:12Z
dc.date.issued1971
dc.description.abstractFriction effects of two-dimensional, periodic, artificial roughness for fully roughened pipes in turbulent flow were investigated. Friction factor data over many different shapes, sizes, and spacings of roughness were compiled and examined for similarities which could be correlated. Such shapes included fins, round rods, rectangular rods, square bars, v- grooves, and sinusoids. It was found that friction factors for two differently- shaped roughness waveforms of the same spacing, amplitude, and pipe diameter are related by the normalized crosscorrelation coefficient of their waveforms. Such roughness falls into two groups: projections, where the bulk flow interacts with the flow near the wall; and grooves, where captive vortices exist in the roughness cavities and do not interact with the bulk flow. Friction factors were related to sine waves of similar size, modified by linear combinations of roughness dimensions and plotted versus a representing parameter R, which was found to be a dimensionless group containing a measure of spacing, amplitude, and pipe diameter. Two correlation plots were developed, for projections and grooves. These show distinct regions which are shown to delineate geometries where various wall flow processes occur. Predictions can thus be made of friction factor and flow type given only the roughness system geometry and shape.
dc.description.departmentChemical and Biomolecular Engineering, Department of
dc.format.digitalOriginreformatted digital
dc.format.mimetypeapplication/pdf
dc.identifier.other13651066
dc.identifier.urihttps://hdl.handle.net/10657/13403
dc.language.isoen
dc.rightsThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.
dc.titleA correlation of friction factors for pipe flow over two-dimensional, periodic geometric roughness
dc.type.dcmiText
dc.type.genreThesis
thesis.degree.collegeCollege of Engineering
thesis.degree.departmentChemical Engineering, Department of
thesis.degree.disciplineChemical Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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