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Fluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performance

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dc.citedby3
dc.contributor.authorMohd Amir F.en_US
dc.contributor.authorYusoff M.Z.en_US
dc.contributor.authorAbu Hassan S.H.en_US
dc.contributor.authorid57345211100en_US
dc.contributor.authorid7003976733en_US
dc.contributor.authorid7201618347en_US
dc.date.accessioned2023-05-29T09:38:30Z
dc.date.available2023-05-29T09:38:30Z
dc.date.issued2022
dc.descriptionBoundary layers; Film thickness; Gravitation; Heat transfer; Mass transfer; Shear flow; Shear stress; Strain rate; Tubes (components); Turbulence models; Circular tubes; Falling film; Falling film on tube; Horizontal-tube; Multi-geometry; Non-circular; Non-circular tube surface; Thermal boundary layer; Wall shear stress; Wall-shear stress; Flow separationen_US
dc.description.abstractA two-dimensional numerical model of a multi-faceted tube is established to investigate fluid film's kinematics and thermal performance on various surface geometries on the same fluid film path. Such surface condition is commonly encountered inside cooling tower fill. The model was solved using the volume of fluid method while the spatial discretization of volume fraction through the compressive method. The results show that the vertical flat and tilted flat surface components contribute most of the thermal performance augmentation with significantly higher fluid film thickness than the circular tube. The film thickness is uniquely characterized by the wall shear stress and the fluid average velocity, Vavg. The maximum fluid film thickness is produced on the leading edge of the tilted flat surface where the wall shear stress decreases due to flow separation that reduces the time rate of strain, dV/d y�. The highest dV/d y� is located on the vertical flat surface where the maximum wall shear stress is produced at the trailing edge capitalizing on gravity force. The multi-faceted tube also performs relatively better than the equivalent circular tube, producing a higher heat transfer coefficient and Nusselt number. � 2021en_US
dc.description.natureFinalen_US
dc.identifier.ArtNo117795
dc.identifier.doi10.1016/j.applthermaleng.2021.117795
dc.identifier.scopus2-s2.0-85119370919
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85119370919&doi=10.1016%2fj.applthermaleng.2021.117795&partnerID=40&md5=ddbd252570e1b8f8fa3dff0bc4f423ef
dc.identifier.urihttps://irepository.uniten.edu.my/handle/123456789/26995
dc.identifier.volume201
dc.publisherElsevier Ltden_US
dc.sourceScopus
dc.sourcetitleApplied Thermal Engineering
dc.titleFluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performanceen_US
dc.typeArticleen_US
dspace.entity.typePublication
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