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dc.contributor.advisorArakeri, Jaywant H
dc.contributor.authorRamesh Chandra, D S
dc.date.accessioned2006-08-28T05:26:19Z
dc.date.accessioned2018-07-31T05:48:39Z
dc.date.available2006-08-28T05:26:19Z
dc.date.available2018-07-31T05:48:39Z
dc.date.issued2006-08-28T05:26:19Z
dc.date.submitted2000
dc.identifier.urihttps://etd.iisc.ac.in/handle/2005/236
dc.identifier.srnonull
dc.description.abstractTurbulent mixed convection is a complicated flow where the buoyancy and shear forces compete with each other in affecting the flow dynamics. This thesis deals with the near wall dynamics in a turbulent mixed convection flow over an isothermal horizontal heated plate. We distinguish between two types of mixed convection ; low-speed mixed convection (LSM) and high-speed mixed convection (HSM). In LSM the entire boundary layer, including the near-wall region, is dominated by buoyancy; in HSM the near-wall region, is dominated by shear and the outer region by buoyancy. We show that the value of the parameter (* = ^ determines whether the flow is LSM or HSM. Here yr is the friction length scale and L is the Monin-Obukhov length scale. In the present thesis we proposed a model for the near-wall dynamics in LSM. We assume the coherent structure near-wall for low-speed mixed convection to be streamwise aligned periodic array of laminar plumes and give a 2d model for the near wall dynamics, Here the equation to solve for the streamwise velocity is linear with the vertical and spanwise velocities given by the free convection model of Theerthan and Arakeri [1]. We determine the profiles of streamwise velocity, Reynolds shear stress and RMS of the fluctuations of the three components of velocity. From the model we obtain the scaling for wall shear stress rw as rw oc (UooAT*), where Uoo is the free-stream velocity and AT is the temperature difference between the free-stream and the horizontal surface.A similar scaling for rw was obtained in the experiments of Ingersoll [5] and by Narasimha et al [11] in the atmospheric boundary layer under low wind speed conditions. We also derive a formula for boundary layer thickness 5(x) which predicts the boundary layer growth for the combination free-stream velocity Uoo and AT in the low-speed mixed convection regime.en
dc.format.extent7489124 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherIndian Institute of Scienceen
dc.rightsI grant Indian Institute of Science the right to archive and to make available my thesis or dissertation in whole or in part in all forms of media, now hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.en
dc.subject.classificationMechanical Engineringen
dc.subject.keywordShear Flowen
dc.subject.keywordConvection Modelen
dc.subject.keywordNear Wall Dynamicsen
dc.subject.keywordFlow Regimesen
dc.subject.keywordMonin-Obukhov Theoryen
dc.subject.keywordWall Shear Stressen
dc.subject.keywordLow Speed Mixed Convection LSM)en
dc.subject.keywordHigh Speed Mixed Convection (HSM)en
dc.titleTurbulent Mixed Convectionen
dc.typeElectronic Thesis and Dissertationen
dc.degree.nameMSc Engg.en
dc.degree.levelMastersen
dc.degree.grantorIndian Institute of Scienceen
dc.degree.disciplineFaculty of Engineeringen


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