Copper oxides 1 Fins (heat exchange) 1 Galerkin approach Gravitation 1 Gravity forces 1 Heat transfer 1 Model variables 1 Nano powders 1 Nanomaterial 1 Nanosized materials 1 Nanostructured materials 1 Radial fins 1 Shapes factors 1 Slip velocity 1 Solidification 1 Thermoanalysis 1 Time step 1 Unsteady modeling 1