Influence of Dimple Height on Turbulent Heat Transfer of Fin Array with Alternate Convex/Concave Dimples
| Autor: | De An Huang, Horng Wen Wu, Tang Hong Chen, Nugroho Putra Kelana |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Fin
lcsh:Engineering machinery tools and implements turbulent heat transfer 020209 energy Geometry 02 engineering and technology 01 natural sciences 010305 fluids & plasmas Quantitative Biology::Subcellular Processes Physics::Fluid Dynamics symbols.namesake Dimple 0103 physical sciences 0202 electrical engineering electronic engineering information engineering lcsh:Technological innovations. Automation dimple height Physics lcsh:HD45-45.2 Finite volume method Turbulence convex/concave dimples General Engineering large eddy simulation Reynolds number Nusselt number Forced convection fin array symbols lcsh:TA213-215 Large eddy simulation |
| Zdroj: | Inventions Volume 5 Issue 3 Inventions, Vol 5, Iss 33, p 33 (2020) |
| ISSN: | 2411-5134 |
| DOI: | 10.3390/inventions5030033 |
| Popis: | This study analyzes transient turbulent modeling of three-dimensional multiple dimpled fin array using large eddy simulation (LES). The Navier&ndash Stokes equations as well as the energy equation were constructed by the finite volume method and then discretized to form algebraic equations, which were solved by semi-implicit method for pressure-linked equation (SIMPLE). The solutions of temperature and velocity were obtained by iterating computation until it converged within each step. This simulation places nine fins on the bottom surface of a channel and changes the height of the dimple (0.4, 0.8, and 1.2 mm) with three different levels of Reynolds number (Re) (3500, 5000, and 6500) to investigate the temperature and flow field without gravity in forced convection. The results indicate that the dimpled fin array can generate vortices between the convex/concave dimples and the fin base and increase the influences of the height of the dimple on the flow field around the fin array. The averaged time-mean of the Nusselt number (Nu) for the dimple height of 0.8 mm is higher than that of the no-dimple case up to 14.4%, while the averaged time-mean Nu for the dimple height of 1.2 mm is lower than that of the no-dimple case up to 11.6%. |
| Databáze: | OpenAIRE |
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