Abstract
In this study, single-phase heat transfer enhancement in internally finned tubes is investigated numerically. The influence of fin number, helix angle, fin height, fin width and shape on the flow and heat transfer characteristics is studied. The research results indicate that the resistance coefficient and Nusselt number both increase with the increment of these parameters, among which the helix angle has the largest impact on the heat transfer enhancement. In addition, the shape of fins also has a small effect on the flow and heat transfer, and the heat transfer effect of triangular fins is the best.
Highlights
Single-phase convection heat transfer enhancement techniques are widely applied in industries such as petroleum, chemical engineering, etc
The fin height and fin width are fixed at 0.5 mm, and the fin number are 15, 30, and 45, respectively
It can be seen that the Nu and f both increase with the augment of the fin number and helix angle
Summary
Single-phase convection heat transfer enhancement techniques are widely applied in industries such as petroleum, chemical engineering, etc. In order to strengthen the single-phase convection heat transfer technology, many heat exchanger elements have been developed, the internally finned tube is one of them. Compared with other heat exchanger elements, the tremendous advantage of internally finned tubes is that its heat transfer effect is greater than the increase of pressure drop. This effect can be seen in turbulent state, but neither the enhancement of heat transfer nor that of pressure drop is obvious in laminar state, they are recommended to be used in turbulent flow (Al-Fahed et al, 1999; Copetti et al, 2004)
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