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Thermal-hydraulic performance of hybrid nano-additives containing multiwall carbon nanotube-Al2O3 inside a parabolic through solar collector with turbulators
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DOI：10.1002/mma.6842.png)
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Abstract
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This article investigates thermal-hydraulic performances of turbulent hybrid nanofluid heat transfer in a parabolic through solar collector equipped with turbulators. The goal of this work is to achieve the maximum performance evaluation criteria (PEC). Water-multiwall carbon nanotube (MWCNT)-Al2O3 (80%:20%) Newtonian hybrid nanofluid and (SST) k - omega turbulence model have been employed. For model theta = 180 degrees, the maximum of Nuave are gained for all of Re, which is followed with models theta = 90 degrees and theta = 0 degrees. For model HO = 15 mm, the maximum of Nuave is achieved for all Reynolds numbers, which is followed with models HO = 10 mm and HO = 5 mm. The model with HO = 5 mm has no maximum of Nuave, but it has lower pressure drop than model HO = 15 mm. Also, it is found that for model BO = 1000 mm, the maximum values of Nuave are achieved for all Re, which is followed with BO = 800 mm and smooth channel. Furthermore, for model delta = 60 degrees, the maximum values of Nuave are achieved during all studied range of Re, which is followed with delta = 40 degrees and delta = 20 degrees, and for model delta = 40 degrees, the maximum values of PEC are gained for all Re, which is followed with model smooth channel and delta = 20 degrees and delta = 60 degrees. The parabolic through solar collector model with theta = 180 degrees, HO = 15, BO = 1000 mm, delta = 40 degrees, and bO = 20 mm is suggested as the best model.
Keywords:
hybrid nanofluid
Nusselt number
parabolic through solar collector
thermal-hydraulic performance
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