“…Salem et al [22] examined the migration of a spherical viscous droplet along the axis of cylindrical tube filled by micropolar fluid and the related problem of spherical micropolar droplet in a viscous fluid-filled cylindrical tube. The effect of the spherical slip cavity on a spherical viscous droplet in a micropolar fluid, and spherical micropolar droplet in a viscous fluid is investigated respectively in [23,24]. Alharbi and Salem [25] studied the effect of a tangential slip and spin slip conditions on steady motion of a micropolar drop within a concentric spherical cavity containing a micropolar fluid.…”