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- W3111863215 abstract "This paper discusses the numerical investigation of the surface roughness effect on the supercritical water flow. A computational attempt has been made to understand the alteration in heat transfer characteristics of supercritical flow due to roughness presence, which remains unexplored. For smooth circular pipe, simulations are performed (using Ansys Fluent) for Shitsman's experimental setup that reported two peaks in wall temperature. The results are in fair agreement with the reported data. This analysis has been further extrapolated for rough pipes by incorporating a roughness model based on the Nikuradse experimental findings for pipe with tightly packed uniform sand-grain roughness. The study spans over different roughness values, and it is observed that the heat transfer deterioration (HTD), which was apparent in the smooth pipe vanished gradually as the roughness value increases, eventually resulting in the smooth wall temperature profile. The different calculated parameters such as heat transfer coefficient, average pressure loss, average turbulent kinetic energy (TKE), and TKE production term revealed that the significant effect of roughness on the flow is evident only after a specific roughness value. However, this rough pipe behavior is similar to what one would expect in the subcritical flow; the wall temperature maxima is sensitive to the smallest roughness presence. Besides, the entropy generation values are enumerated for different roughness to gain a better insight into heat transfer. This calculation shows that the contribution in entropy production due to the thermal gradient is much higher than the dissipation. Also, the total entropy generation peaked at some intermediate value of roughness. The observed maximum can be attributed to the supercritical fluids properties variation with temperature." @default.
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- W3111863215 date "2020-12-07" @default.
- W3111863215 modified "2023-09-23" @default.
- W3111863215 title "Effect of surface roughness on heat transfer in the supercritical water flow" @default.
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