Question

Fin efficiency is increased by_______

(a) Using insulating material

(b) Decreasing the fin aspect ratio

(c) Using more conductive material

(d) Decreasing the fin aspect ratio & Using more conductive material

I got this question in my homework.

Asked question is from Transistor Case and Heat Sinks topic in division Differential and Multistage Amplifiers of Electronic Devices & Circuits

Answer 1

The correct answer is (d) Decreasing the fin aspect ratio & Using more conductive material

The explanation is: Fin efficiency is one of the parameters which formulate a higher thermal conductivity material significant. A fin of a heat sink may be measured to be a flat plate with heat flow in one end and being dissipated into the surrounding fluid as it travels to the other.  As heat flows through the fin, the grouping of the thermal resistance of the heat sink impeding the flow and the heat lost due to convection, the temperature of the fin and, consequently, the heat transfer to the fluid, will decrease from the bottom to the end of the fin. Fin efficiency is defined as the actual heat transferred by the fin, separated by the heat transfer were the fin to be isothermal.