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Heat transfer under laminar natural convection from a hollow cylindrical fin mounted on a horizontal base plate has been numerically The flow outside the fin is much stronger than that inside the hole and as a consequence the rate of heat transfer from a hollow fin is primarily due to the contribution by the outer surface of the Fortunately, the rate of heat transfer is not negatively affected by the presence of the hole at the fin On the contrary, when the Grashof number is higher or the hole diameter is bigger, the inside surface contributes marginally to the heat A hollow fin saves material and weighs less compared to a solid So, this feature may be exploited.
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