Numerical investigation of effect of buoyancy on the wake of a heated cylinder in contra flow

dc.contributor.advisor Zhi J. Wang
dc.contributor.author Varma, Khyati
dc.contributor.department Aerospace Engineering
dc.date 2018-08-22T22:48:59.000
dc.date.accessioned 2020-06-30T07:41:48Z
dc.date.available 2020-06-30T07:41:48Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 2007
dc.date.issued 2007-01-01
dc.description.abstract <p>Flow over a cylinder is a classically and practically interesting problem. A number of studies focus on the vortex shedding and wake instability of an unheated cylinder. Inspite of its applications flow over a heated cylinder operating in a mixed convection region has received very little attention. The present study aims at the numerical investigation of unsteady heat transfer for a laminar flow past a circular cylinder with small aspect ratio (L/d=7) or finite spanwise length with no-slip wall conditions. A circular cylinder is exposed to approaching flow stream in the direction of gravity or opposing the direction of buoyant force (contra flow). The Reynolds number and the temperature of the incoming flow are set as Re=130 and 297 K respectively. The temperature of the heated cylinder is varied between 297 K to 358 K corresponding to Richardson number varying between Ri=0.0 and Ri=1.05. The analysis performed focuses on the effect of buoyancy on the wake instability in terms of vortex shedding frequency, drag forces, wake centerline velocities, averaged Nusselt number and transition phenomenon. In addition to this, preliminary study is conducted to understand the influence of small aspect ratio and end effects on the transition mechanism due to heating. Numerical results are compared to available experimental data and some new results are presented.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/15091/
dc.identifier.articleid 16090
dc.identifier.contextkey 7015124
dc.identifier.doi https://doi.org/10.31274/rtd-180813-16224
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/15091
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/68688
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/15091/1446127.PDF|||Fri Jan 14 20:35:31 UTC 2022
dc.subject.disciplines Aerospace Engineering
dc.subject.disciplines Mechanical Engineering
dc.subject.keywords Aerospace engineering
dc.title Numerical investigation of effect of buoyancy on the wake of a heated cylinder in contra flow
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication 047b23ca-7bd7-4194-b084-c4181d33d95d
thesis.degree.level thesis
thesis.degree.name Master of Science
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