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Examination of Twisted Elliptical Tube Heat Enhancement Within the Mixed Convective Zone


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DOI: https://doi.org/10.15866/ireme.v16i9.22433

Abstract


Previously, the investigation of the heat transfer performance of twisted elliptical tubes has been restricted to the effects of forced convective conditions without considering the impact of buoyancy conditions. Therefore, this work investigates heat transfer enhancement of twisted elliptical tubes of different pitch lengths at different mixed convective regimes. The model continuity, momentum, and energy equations were solved using the finite volume technique and validated using both analytical and experimental results. Under the variation of Gr and Re, the results show that twisted elliptical tubes are better than smooth elliptical tubes for heat transfer but with a corresponding high drag coefficient. The heat enhancement of 48% was obtained at a twisted pitch length of 200 mm and Re of 2000 as compared to the plain tube. In addition, on the effect of twist pitch length, the results show that the more twisted a tube is the more its Nu and F. This indicates that induced secondary flow by the twist has a high impact on the Nu and F. The results show that heat enhancement of the elliptical tube depends on P, Gr, and Re. Similarly, there is a fluid-thermal-structure interaction interplay in the hydrothermal behavior of elliptical tubes.
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Keywords


Twisted Elliptical Tube; Twisted Pitch Length (P); Reynold Number; Grashof Number; Nusselt Number; Friction Factor

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References


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