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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

η

_{o}= 1 - (NAc/At) (1-η

_{f})

A

_{t}= NA

_{c}+A

_{b}

## The Attempt at a Solution

n

_{f}= tanh(mL

_{c})/mL

_{c}

(I know this equation is right, but I'm lost from this point forward. Any help would be excellent.)