Numerical Analysis of Heat Transfer and Thermal Performance Analysis of Surface with Circular Profile Fins

In the present work a Computational Fluid Dynamics (CFD) study was conducted to investigate the heat transfer and friction loss characteristics in a horizontal rectangular channel having attachments of circular profile fins over one of its heated surface. The Reynolds number based on the flow averaged inlet velocity and the hydraulic diameter, ranged from 5000 to 30,000. The circular profile fins considered are of 5cm height and diameter of 2cm dimensions mounted on a heating surface vertically. Reynolds number, fin arrangement and fin pitch in the flow direction are the numerical parameters. The in-line and staggered fin arrangement was studied for one-fixed span wise (Sx/d=3) and four different stream wise (Sy/d=3, 3.75, 5 and 7.5) distances. Different turbulent models have been used for the analysis and their results are compared. Realizable k-ε model based results have been found a good agreement and thus this model is used to predict the heat transfer and friction factor in the duct. The overall enhancement ratio has been calculated in order to discuss the overall effect of fin spacing and operating parameters. A maximum value of enhancement ratio is found 1.2 for the range of parameters investigated.

並列關鍵字

Finned surface ； Thermal performance ； CFD ； Heat transfer ； Friction ； turbulence

國際替代計量

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