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kdb12
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Homework Statement
A straight, rectangular fin made from 2024 aluminium has a thickness of t = 3mm and length L = 20mm. Base temperature is 100 °C and it is exposed to a fluid at 20 °C.
h = 60 W/m^2-K
k = 185 W/m-K
(a) Determine the heat transfer rate from the fin to the fluid per unit length
(b) Repeat (a) if the fin is made of copper (h = 400 W/m^2-K)
Homework Equations
ηo = 1 - (NAc/At) (1-ηf)
At = NAc+Ab
The Attempt at a Solution
nf = tanh(mLc)/mLc
(I know this equation is right, but I'm lost from this point forward. Any help would be excellent.)