Heat transfer from a rotating sphere interacting with a vortex

The evolution of the thermal field around a rotating/spinning sphere interacting with an advecting vortex is investigated using numerical methods in the Reynolds number range 20⩽Re⩽300 for particle angular velocities of 0⩽Ω⩽0.5. It is found that particle rotation and the presence of the vortex significantly influence the heat transfer distribution locally but the time-averaged values are less affected as compared to classical laminar flow over a solid sphere. Computations in combination with surface blowing indicate that blowing significantly reduces overall heat transfer rates but has a very limited influence in damping out the transients caused by an advecting vortex. A heat transfer correlation for the vortex interaction is also provided.