Analysis of nanoparticles migration on natural convective heat transfer of nanofluids

► Two-phase modeling for simulation of natural convection of nanofluids is made. ► Particles migration which changes convection heat transfer is illustrated. ► Slip velocities cause nanoparticles to move and make the nanofluid nonhomogeneous. ► Nonhomogeneity means that density changes with temperature and volume fraction. ► Shrinkage of main circulation is the reason of decrease of natural convection.