Influence of nanoparticle shape factor on convective heat transfer and energetic performance of water-based SiO2 and ZnO nanofluids

Abstract To appreciate the merits, in terms of energy, of two nanofluids and of two shapes of nanoparticles, an experimental study has been carried out on water-based SiO 2 and ZnO nanofluids flowing inside a horizontal tube whose wall temperature is imposed. Pressure drop and heat transfer coefficients have been measured at two different inlet temperatures (20 °C, 50 °C) in heating and/or cooling conditions at various flow rates (200