Abstract
The flow and heat transfer characteristics of a tube with an integrated internal longitudinal fin were studied by experiment and numerical simulation. The effects of inscribed circle diameter and fin included angle on the thermal performance were investigated by numerical simulation. The numerical results were in good agreement with the experimental data. The results indicated that the tube-IILF was superior to the ST. For the experiment, the α of the T30D10 was 3.2–4.0 times higher than that of the ST when 5177 ≤ Re ≤ 9432. In general, the f of the T30D10 was higher than that of the ST. In the work, both the α and f decreased with the increase of the dins, while increased with the decrease of the θ. The (α/α0)/(f/f0)1/3 values of the tubes-IILF were more than 1. It is demonstrated that the tube-IILF has a significant heat transfer enhancement. Besides, the velocity, pressure, and temperature distributions were obtained to discern the mechanisms of heat transfer enhancement.
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