Molecular dynamics study of the effect of external electric field amplitude and cavity on thermal properties of Ammonia/Copper Nano-Refrigerant

•The Molecular Dynamics simulation method is implemented.•This study simulates ammonia refrigerant’s atomic behavior with Cu nanoparticles in a nanochannel.•With increasing the external electric field amplitude to 5 Å, the heat flux values converge to 1395 W/m2.•The sample has a higher heat flux in the presence of a rectangular cubic atomic cavity.•Heat flux and aggregation time values for samples with rectangular cubic cavities are 1650 W/m2, 4.59 ns, respectively.