Experimental Study of Roughness Effect on Turbulent Shear Flow Downstream of a Backward Facing Step

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dc.contributor.authorEssel, Ebenezer Ekow
dc.contributor.examiningcommitteeKuhn David (Mechanical and Manufacturing Engineering) Clark, Shawn (Civil Engineering)en_US
dc.contributor.supervisorTachie, Mark (Mechanical and Manufacturing Engineering)en_US
dc.date.accessioned2014-01-16T17:19:34Z
dc.date.available2014-01-16T17:19:34Z
dc.date.issued2014-01-16
dc.degree.disciplineMechanical and Manufacturing Engineeringen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractAn experimental study was undertaken to investigate the effect of roughness on the characteristics of separated and reattached turbulent shear flow downstream of a backward facing step. Particle image velocimetry technique was used to conducted refined velocity measurements over a reference smooth acrylic wall and rough walls produced from sandpaper 36 and 24 grits positioned downstream of a backward facing step, one after another. Each experiment was conducted at Reynolds number based on the step height and centerline mean velocity of 7050. The results showed that sandpaper 36 and 24 grits increased the reattachment length by 5% and 7%, respectively, compared with the value obtained over the smooth wall. The distributions of the mean velocities, Reynolds stresses, triple velocity correlations and turbulence production are used to examine roughness effects on the flow field downstream of the backward facing step. Two-point auto-correlation function and proper orthogonal decomposition (POD) are also used to investigate the impact of wall roughness on the large scale structures.en_US
dc.description.noteFebruary 2014en_US
dc.identifier.urihttp://hdl.handle.net/1993/23265
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectseparated and reattached flowen_US
dc.subjectbackward facing stepen_US
dc.subjectwall roughnessen_US
dc.subjectproper orthogonal decompositionen_US
dc.subjecttwo-point auto-correlationen_US
dc.subjectparticle image velocimetryen_US
dc.titleExperimental Study of Roughness Effect on Turbulent Shear Flow Downstream of a Backward Facing Stepen_US
dc.typemaster thesisen_US
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