Atomic rheology analysis of the external magnetic field effects on nanofluid in non-ideal microchannel via molecular dynamic method

Abstract

In the present study, the molecular dynamics method is used to probe the aggregation phenomenon of hybrid nanoparticle within platinum microchannel with pyramidal barriers. In molecular dynamics simulations, argon atoms are described as base fluid particles and for the interaction between these atoms, we use Lennard-Jones potential, while the platinum–platinum and Al2O3 nanoparticles interactions are simulated applying the embedded atom method force field. To analyze the achieved simulation results, some physical parameters such as potential energy, temperature, and distance of nanoparticles center of mass are calculated. The results show external magnetic field decrease the aggregation phenomenon in nanoparticles. Numerically, by adding external magnetic field to simulation box, the COM distance of nanoparticles reaches to 2.7 A and the aggregation time of nanoparticles changes from 1.7 to 2.3 ns. These appropriate effects of external magnetic field from our computational study can be used in the design of heat transfer applications.