Abstract
•Novel Fe2O3-TiO2/water hybrid nanofluid was tested as a coolant in aluminum tube radiator.•Heat transfer rate increased by 26.7% as compared to water.•Nusselt number increased by 20.03% in comparison to water.•Observed substantial agglomeration and sedimentation after 20 h.•Effect of inlet temperature, flowrate, and nanoparticle concentration is evaluated.
Nanofluids have emerged as potential prospect coolant in heat transfer applications. Hybrid nanofluid is recently developed class of nanofluids having two different types of nanoparticles suspended in the base fluid. In this research, a novel hybrid nanofluid containing Fe2O3-TiO2 (50:50) nanoparticles suspended in water basefluid has been used to improve the convective heat transfer in aluminum tube automotive radiator. Three hybrid nanoparticle concentrations (0.005 vol.%, 0.007 vol.% and 0.009 vol.%) were tested. Effect of inlet temperature and fluid velocity on heat transfer rate was examined by varying the inlet temperature from 48 °C to 56 °C and flowrate from 11 LPM to 15 LPM. Heat transfer rate increased by a maximum of 26.7% at 56 °C inlet temperature, 15 LPM flowrate and 0.009 vol.% nanoparticle concentration. At aforementioned operating conditions, Nusselt number increased by 20.03%. Increase in inlet temperature from 48 °C to 56 °C increased the heat transfer rate by 8%. Past 0.009 vol.% concentration, nanoparticle clogging diminished the stability of hybrid nanofluid which results in overall performance deterioration.
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