Fluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performance
Boundary 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 lay...
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Elsevier Ltd
2023
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my.uniten.dspace-269952023-05-29T17:38:30Z Fluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performance Mohd Amir F. Yusoff M.Z. Abu Hassan S.H. 57345211100 7003976733 7201618347 Boundary 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 separation A 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. � 2021 Final 2023-05-29T09:38:30Z 2023-05-29T09:38:30Z 2022 Article 10.1016/j.applthermaleng.2021.117795 2-s2.0-85119370919 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85119370919&doi=10.1016%2fj.applthermaleng.2021.117795&partnerID=40&md5=ddbd252570e1b8f8fa3dff0bc4f423ef https://irepository.uniten.edu.my/handle/123456789/26995 201 117795 Elsevier Ltd Scopus |
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| description |
Boundary 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 separation |
| author2 |
57345211100 |
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57345211100 Mohd Amir F. Yusoff M.Z. Abu Hassan S.H. |
| format |
Article |
| author |
Mohd Amir F. Yusoff M.Z. Abu Hassan S.H. |
| spellingShingle |
Mohd Amir F. Yusoff M.Z. Abu Hassan S.H. Fluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performance |
| author_sort |
Mohd Amir F. |
| title |
Fluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performance |
| title_short |
Fluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performance |
| title_full |
Fluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performance |
| title_fullStr |
Fluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performance |
| title_full_unstemmed |
Fluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performance |
| title_sort |
fluid film characteristics over horizontal multi-faceted tube and the augmentation of thermal performance |
| publisher |
Elsevier Ltd |
| publishDate |
2023 |
| _version_ |
1806428175652093952 |
| score |
13.214268 |