heat transfer Heat transfer 9 Heat flux 5 nanofluid 5 Cooling 4 Flow of fluids 4 Nanofluidics 4 Nanofluids 4 Nanoparticles 4 Numerical methods 4 PEMFC 4 fluid flow 4 mini channel 4 Cooling systems 3 Entropy 3 Entropy generation 3 Heat Transfer enhancement 3 Numerical models 3 Temperature 3 article 3 cooling 3 numerical simulation 3 porous medium 3 simulation 3 thermodynamics 3 Aluminum 2 Carbon 2 Cylinders (shapes) 2 Developing countries 2 Drops 2