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- W4200552908 abstract "Low-Re-number turbulent flow and convective heat transfer of Al2O3-water nanofluid inside a helically corrugated channel (HCC) were examined numerically. The helically corrugated channel (HCC) was studied for the first time by analogy to a helically corrugated tube. The Reynolds number (based on the nanofluid properties) varies between 5000 and 10000. The nanoparticles volume fraction ranges from 0.1% to 5%. Also, the nanoparticle sizes of 20 nm, 40 nm, and 60 nm were considered. The two-phase mixture model was utilized in the simulations. The numerical results were compared with the experimental data. It was illustrated that a previously established correlation for the effective viscosity could be erroneous in certain circumstances. Hence, that model was amended carefully, and a correlation for nanoparticles with the mean diameter of 20 nm was presented. It was argued that the 20 nm nanoparticles slightly decrease the thickness of the velocity boundary layer. Besides, it was shown that there is a critical particle size above that the heat transfer decreases. Based on the present study, the recirculation region in the corrugation cavity has a significant impact on the turbulent mixing for Re ≥ 10000. Among the tested cases, the maximum ratio of Nusselt number was 1.413 for the particle size of 20 nm and the volume fraction of 5%, while the corresponding pressure drop ratio was 7.122." @default.
- W4200552908 created "2021-12-31" @default.
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- W4200552908 date "2021-12-09" @default.
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- W4200552908 title "Two-phase modeling of low-Reynolds turbulent heat convection of Al<sub>2</sub>O<sub>3</sub>-water nanofluid in a 2-D helically corrugated channel" @default.
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- W4200552908 doi "https://doi.org/10.1080/00986445.2021.2009467" @default.
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