Effect of Diameter Ratio on Heat Transfer Enhancement in a Circular Tube with Twistedâ€“Tape
Keywords:heat transfer, laminar flow, periodic flow, thermal performance, twistedâ€“tape
The influences of diameter ratios (DR = W/D), DR = 0.2â€“0.8, with single twistedâ€“ratio (y/W) of 2.0 on heat transfer, pressure loss and thermal performance in a circular tube are investigated numerically in 3D. The finite volume method (FVM) and the SIMPLE algorithm are applied in this study. The fluid flow and heat transfer characteristics are presented for Reynolds number (Re) ranging from 100 to 2000. As the numerical results, the twistedâ€“tape can generate the swirling flow that helps to increase heat transfer rate, but also increase in pressure loss. Additionally, the rising DR value results in the increase of Nusselt number and friction factor. The computational results reveal that the optimum thermal enhancement factor of using the twistedâ€“tape insert is about 2.4 at DR = 0.2 and Re = 2000.
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