Numerical Investigation on Heat Transfer Enhancement of Graphene Oxide-Water Nanofluids in a Corrugated Channel

Abstract

The present study represents the heat transfer enhancement of graphene oxide-water nanofluids in a corrugated channel. A uniform heat
flux was subjected to the bottom surface of the channel and mixture model was applied to investigate parameters of five Reynolds number
(133<Re<1515), four volume fractions (φ=0.139, 0.278, 0.417 and 0.556 %) and two amplitudes of the corrugated wall (a=5 and 10 mm).
The numerical solution procedure includes the investigation of heat transfer and pressure drop characteristics with using finite volume method with standard k-ε turbulence model to solve the continuity, momentum, energy and turbulence equations in three dimensional domain.
The results indicated that the heat transfer enhancement increased with decreasing of amplitude. The use of graphene-water nanofluids leads
to increase in heat transfer and pressure drop over the smooth channel. The Nusselt number increased with increasing volume fraction and
Reynolds number. In conclusion, to enhance heat transfer, graphene oxide-water nanofluids and corrugated surfaces can be widely applied
wherever heat exchangers with channels are used.