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Experimental study of forced and free convective heat transfer in the thermal entry region of horizontal concentric annuli

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dc.citedby44
dc.contributor.authorMohammed H.A.en_US
dc.contributor.authorCampo A.en_US
dc.contributor.authorSaidur R.en_US
dc.contributor.authorid15837504600en_US
dc.contributor.authorid23157654000en_US
dc.contributor.authorid6602374364en_US
dc.date.accessioned2023-12-29T07:51:28Z
dc.date.available2023-12-29T07:51:28Z
dc.date.issued2010
dc.description.abstractForced and free convective heat transfer for thermally developing and thermally fully developed laminar air flow inside horizontal concentric annuli in the thermal entrance length has been experimentally investigated. The experimental setup consists of a stainless steel annulus having a radius ratio of 2 and an inner tube with a heated length of 900mm subjected to a constant wall heat flux boundary condition and an adiabatic outer annulus. The investigation covers Reynolds number range from 200 to 1000, the Grashof number was ranged from 6.2�105 to 1.2�107. The entrance sections used were long tube with length of 2520mm (L/Dh=63) and short tube with length of 504mm (L/Dh=12.6). The surface temperature distribution along the inner tube surface, and the local Nusselt number distribution versus dimensionless axial distance Zt were presented and discussed. It is inferred that the free convection effects tended to decrease the heat transfer at low Re number while to increase the heat transfer for high Re number. This investigation reveals that the Nusselt number values were considerably greater than the corresponding values for fully developed combined convection over a significant portion of the annulus. The average heat transfer results were correlated in terms of the relevant dimensionless variables with an empirical correlation. The local Nusselt number results were compared with available literature and show similar trend and satisfactory agreement. � 2010.en_US
dc.description.natureFinalen_US
dc.identifier.doi10.1016/j.icheatmasstransfer.2010.04.007
dc.identifier.epage747
dc.identifier.issue7
dc.identifier.scopus2-s2.0-77955268114
dc.identifier.spage739
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-77955268114&doi=10.1016%2fj.icheatmasstransfer.2010.04.007&partnerID=40&md5=5ae8ec44ce430ea2de25ecdbea5ca805
dc.identifier.urihttps://irepository.uniten.edu.my/handle/123456789/30695
dc.identifier.volume37
dc.pagecount8
dc.sourceScopus
dc.sourcetitleInternational Communications in Heat and Mass Transfer
dc.subjectForced free convection
dc.subjectHorizontal annulus
dc.subjectThermal entry length problem
dc.subjectForced convection
dc.subjectNatural convection
dc.subjectNusselt number
dc.subjectPipe flow
dc.subjectReynolds number
dc.subjectStainless steel
dc.subjectTubes (components)
dc.subjectVehicular tunnels
dc.subjectAxial distance
dc.subjectCombined convection
dc.subjectConcentric annuli
dc.subjectConstant wall heat flux
dc.subjectConvective heat transfer
dc.subjectDimensionless variables
dc.subjectEmpirical correlations
dc.subjectEntry length
dc.subjectEntry region
dc.subjectExperimental setup
dc.subjectExperimental studies
dc.subjectFree convections
dc.subjectHeated lengths
dc.subjectHorizontal annulus
dc.subjectInner tubes
dc.subjectLaminar airflow
dc.subjectLocal Nusselt number
dc.subjectLong tubes
dc.subjectRadius ratio
dc.subjectRe numbers
dc.subjectShort tube
dc.subjectSurface temperature distribution
dc.subjectThermal entrance
dc.subjectHeat exchangers
dc.titleExperimental study of forced and free convective heat transfer in the thermal entry region of horizontal concentric annulien_US
dc.typeArticleen_US
dspace.entity.typePublication
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