Radiation heat transfer is almost negligible in comparison to the convective heat transfer for the following reasons |
1) Radiation within the fins spacing goes into other fins. |
2) Only radiation from the tips of the fins’ surfaces reaches surrounding bodies. |
3) Radiation is subject to exposed surface material and its emissivity. |
4) Forced convective heat-transfer amplifies convection of the sink’s heat and diminishes the importance of the radiation heat transfer in scope and magnitude. |