▎ 摘　　要

The effect of using water/graphene oxide nanofluid as a working fluid on heat transfer and pressure drop was studied experimentally. For this purpose, subsonic wind tunnel and a closed heat transfer cycle were used at the same time. The effect of different concentrations (0, 0.05, 0.1, 0.2% by volume) of water/-graphene oxide nanofluid at different Reynolds numbers in a tube under air cross-flow was evaluated in wind tunnel tests. The range of Reynolds number of the flow around the tube was between 3800 and 21500 (3800