The Effect of Angled Fins in Generating Swirling Flows with Vortices That Augment Heat Transfer Performance in an Annular Conduit

This paper examined the usage of thermally conductive angled fins within an annular conduit through numerical simulation. Despite the thermally conductive nature of the fins increasing heat transfer surface area, this investigation found that using an optimal fin angle can promote the generation of...

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Bibliographic Details
Published inInternational journal of energy research Vol. 2023; pp. 1 - 23
Main Authors Nair, S. R., Tan, M. K., Wang, Y., Kazi, S. N., Oon, C. S.
Format Journal Article
LanguageEnglish
Published Bognor Regis Hindawi 12.09.2023
Hindawi Limited
Subjects
Algorithms
Fins
Friction
Geometry
Heat exchangers
Heat transfer
Mathematical models
Optimization
Performance evaluation
Pressure
Pressure drop
Reynolds number
Robustness (mathematics)
Sea surface
Swirling
Turbulence
Turbulence models
Vortices
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Summary:This paper examined the usage of thermally conductive angled fins within an annular conduit through numerical simulation. Despite the thermally conductive nature of the fins increasing heat transfer surface area, this investigation found that using an optimal fin angle can promote the generation of vortical structures which aid heat transfer. Using ANSYS-Fluent with the SIMPLEC algorithm and the SST κ−ω turbulence model, this research found that heat transfer performance improved considerably when the generated vortices were sufficiently large and robust. However, the type of generated vortex had a profound impact when optimising for higher performance evaluation criterion (PEC) values. Longitudinal vortices improved heat transfer performance with a low impact on pressure drop increase, unlike transverse vortices, which increased pressure drop significantly. The fin angles of 50° and 60° yielded high heat transfer performance without much increase in pressure drop, thus resulting in higher PEC values. Additionally, using fin heights that correlate to 20% to 60% of the gap between the concentric walls was ideal when designing heat exchangers to achieve higher PEC values. The results of this numerical investigation have been validated both theoretically and experimentally to ensure accurate reporting of the findings.
ISSN:0363-907X
1099-114X
DOI:10.1155/2023/5104085