About the Journal :
Convective heat transfer can be enhanced by changing flow geometry and/or by enhancing
thermal conductivity of the fluid. In this work, CFD modelling of horizontal straight and curved
channel with square cross section were presented to investigate the effect of hybrid nanofluids on
turbulent forced convective heat transfer. This study proposes simultaneous passive heat transfer
enhancement by combining the geometry effect using 0.1% graphene nanoplatelets-silver hybrid
nanofluids (GNP–Ag) inflow in straight and curved channel. The results showed that the average
Nusselt number is generally higher for curved channel with hybrid nanofluid when compared
with straight square channel. Moreover, for 0.1% of GNP–Ag hybrid nanofluid improvement is
22.61% and 34.78% for straight channel and 27.43% and 39.52 for curved channel at the
Reynolds number of 5,000 and 17,500, respectively.
Keywords: Heat transfer; turbulent flow; hybrid nanofluid; curved channel; straight channel.