Heat transfer from a transistor may be enhanced by inserting it in an aluminium sleeve (k = 200 W/m −
K) having integrally machined longitudinal fins on its
outer surface. Transistor radius and height are r1 =
2 mm & H = 6 mm respectively, while the fins are of
length L = r3 − r2 = 10 mm of uniform thickness t =
0.7 mm. The thickness of the sleeve base is r2 − r1 =
1 mm. Contact resistance of the sleeve transistor
interface is Rt, c

′′ = 10−3 m2

.K/W. Air at T∞ = 20°C
flows over the fin surface providing uniform
convection with h = 25 W
m2−K
. Assume 1-D radial heat

transfer,
a) Sketch the equivalent thermal circuit for heat
transfer from transistor case (r = r1) to the air.
Label each resistance. [1]
b) Evaluate each resistance. [2]
c) If the temperature of the transistor case is T1 = 80 °C, what is the rate of heat transfer from
the sleeve?