abstract
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In this study, water-based nanofluids are thermally and hydrodynamically evaluated in a coiled flow inverter as the heat exchanger (CFI-HE). Aluminum oxide (Al
2 O3 ) and titanium dioxide (TiO2 ) nanoparticles are used to prepare samples with 1%¿3% volume concentrations. An experimental analysis is performed at a steady state under laminar and turbulent flow conditions (2000 < Re < 19,000). Nusselt number and friction factor correlations were developed. The performance evaluation criterion (PEC) based on the Nusselt number, and the Fanning friction factor is used to evaluate the CFI-HE. The results show that all nanofluids demonstrate an improved PEC compared with the base fluid. The Al2 O3 /H2 O and TiO2 /H2 O water-based nanofluids at 3%vol under the turbulent flow conditions achieved maximum increases of 53% and 59%, respectively, illustrating that using nanofluids in a CFI-HE is a feasible option for the process intensification in thermal applications. © 2022