Influence of dimple height on turbulent heat transfer of fin array with alternate convex/concave dimples

Horng Wen Wu, Tang Hong Chen, Nugroho Putra Kelana, De An Huang

研究成果: Article同行評審

摘要

This study analyzes transient turbulent modeling of three-dimensional multiple dimpled fin array using large eddy simulation (LES). The Navier–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%.

原文English
文章編號33
頁(從 - 到)1-22
頁數22
期刊Inventions
5
發行號3
DOIs
出版狀態Published - 2020 九月

All Science Journal Classification (ASJC) codes

  • 工程 (全部)

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