Unsteady heat transfer in colloidal suspension containing hybrid nanostructures

Abstract

Theoretical investigation about the role of hybrid nanoparticles to enhance the effective thermal conductivity of working micropolar fluid over a non-uniformly moving surface having non-uniform temperature and exposed to non-uniformly magnetic field is carried out. Additional conservation law of angular momentum is used to study the dynamics of microrotation field in the presence of hybrid nanoparticles. It is observed that rise in vortex viscosity causes a remarkable rise in microrotation velocity. However, opposite trend is noted for the case of macro-velocity. The vortex viscosity and spin gradient viscosity both have significant effects on temperature, and an increase in a vortex and spin gradient viscosities results in a significant decrease in temperature. It is also noted that impact of vortex and spin gradient viscosities on the temperature of a micropolar mixture containing only copper particles is less than the impact of the vortex and spin gradient viscosities on the temperature of a micropolar mixture containing Cu and Al2O3.