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This paper presents the computational analysis of convective heat transfer characteristics, pressure drop, and entropy generation characteristics of Al2O3/water nanofluids in a noncircular duct (triangular) using a single phase approach under a turbulent flow regime. The thermal and pressure drop characteristics of different concentrations of Al2O3 nanoparticles (NPs) and the analysis were carried out in Fluent software using a k‐ε approach under constant wall heat flux around the boundary. The results show that there is an increase in pressure drop and thereby an increase in friction by 20% for the smooth condition. The total pressure drop between the entry and exit section of the duct is increased to approximately 84.2% and 85.6% for a higher Reynolds number (Re = 10 000) compared with that of base fluid. Similarly, the entropy generation of water is increased by 40% as compared with 0.05% and 0.1% Al2O3 NPs. There is also a decrease in entropy generation identified while there is an increase in the Reynolds number. The convective heat transfer of 0.05% and 0.1% nanofluid has a similar trend with increased Reynolds number. The maximum performance is observed at the Reynolds number (Re = 4000) and found to be 1.29 for 0.1% concentration, whereas, the fluid at 0.05% is observed to be at 1.23. At a higher Reynolds number (Re = 10 000) the performance index decreased to approximately 1.19 and 1.25 for 0.05% and 0.1%, respectively.

This study communicates the performance analysis of spiral and serpentine tube solar collector with carbon nanotube nanofluids under natural flow method. Experiments were carried out at three different mass flow rates namely 3, 5, and 7 kg/hour while the concentration of nanoparticles was varied from 0.05% and 0.1%, respectively. Experiments were carried out under the same condition of ambient parameters for validation. Results show that the maximum exit water temperature was found to be about 75°C with a maximum concentration of 0.1% under a minimum flow rate of 3 kg/hour during the peak intensity. Similarly, the improvement in temperature of the water is found to be 6% under peak intensity and decreased to about 4.3% and 4.2% for the flow rates of 5 and 7 kg/hour, respectively

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