Figure compares the steady state velocity fields around nanospheres (a, b) and vertically oriented nanorods (c, d) located in the centre of spherical enclosures for which the axial symmetry assumption is valid. For all of these cases, the effect of slip boundary condition on the confining walls only have a moderate effect on the velocity magnitude. Although the temperature attained by a nanorod is considerably higher than the nanosphere for the same intensity of light, the velocity field in (a, b) is stronger than (c, d) as the intensities of laser are 1 mW/μm 2 and 0.5 mW/μm 2 respectively. The same intensity as for the nanosphere was not used for the nanorod because at 1 mW/μm 2 , the nanorod temperature rises far beyond 100 o C for which temperature independence of material properties and liquid surrounding medium assumption are not valid. As the velocity vectors suggest, the hotter fluid near the nanoparticle flow upward, the replacing fluid rise from below. The velocities are significant only within the close proximity of the nanoparticle. Apparently, a smaller confinement of 3.6 μm significantly reduce the velocity magnitude relative to the bigger confinement of 14.4 μm for which the velocity field is significantly strong. For the case of nanorod inside a spherical enclosure, the 3D velocity vectors around a horizontal nanorod irradiated by 0.5 mW/μm 2 laser are shown in Figure (a). The velocity fields presented quantitatively in Figure (c) shows similar flow patterns as nanosphere and the difference between slip and no-slip boundary conditions on confining walls is apparent. When the nanoparticle is attached or in close proximity to the wall, the replacement of the upward moving surrounding fluid is not possible by fluid flow from below (Figure ). Thus, the overall velocity field is much weaker in this case although the diameter of the hemispherical confinement is same as the spherical one of 14.4 μm in Figure and. Figure illustrates the velocity field around a 180 nm nanosphere close to the bottom wall (at 180 from the bottom) inside a hemispherical enclosure.