Heat transfer fluids Thermal conductivity 2 3D simulation 1 3D simulations 1 Buoyancy forces 1 Computational fluid dynamics 1 Copper oxides 1 Cupric oxide 1 Entropy 1 Entropy approach 1 Exergy 1 Force and viscosity 1 Heat Transfer enhancement 1 Heat convection 1 Heat exchangers 1 Heat flux 1 Heat radiation 1 Heat storage 1 Heat transfer enhancement 1 Heat transfer fluid 1 Heat transfer performance 1 Inner walls 1 Low thermal conductivity 1 MWCNT 1 Melting process 1 Metal melting 1 Molten materials 1 Multi-walled-carbon-nanotubes 1 Multiwalled carbon nanotubes (MWCN) 1 Nanocomposites 1