Abstract
The present study investigates the temperature-dependent efficacy analysis of nanofluids for both laminar and turbulent flow applications. Characterizations for the thermo-physical properties of nanofluids are carried out at different temperatures for the viability analysis. Thermal conductivity of yttria nanofluids shows strong temperature dependence compared to copper nanofluids with an increase of 7.5% to 21% for a temperature range of 25 °C to 85 °C. Moreover, the effective viscosity of yttria nanofluids is found to decrease gradually with temperatures in spite of copper nanofluid insensitivity. A theoretical study is carried out to compute the efficacy of yttria and copper nanofluids for laminar and turbulent flow regimes over a range of temperatures with the help of their thermo-physical properties. Yttria nanofluids are found viable for both laminar and turbulent flow for temperatures above 37 °C and 45 °C, respectively. On the other hand, copper nanofluids are found applicable only in laminar flow condition for temperatures above 75 °C. The stability and superior figure of merit for yttria nanofluids with temperature make it a potential coolant for higher-temperature convective cooling systems working on both laminar and turbulent flows.
Published Version
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