A hot surface at 150°C is to be cooled by attaching 30 mm-long
aluminum pin fins (k= 237 W/m·K) having
the square cross-section (3-mm x 3-mm) as
shown in figure. The temperature of the
surrounding medium is 25°C, and the heat
transfer coefficient on the surfaces is 30
W/m2
·K. Determine the rate of heat transfer
from the surface for a 57-mm x 53-mm
section of the plate. Also determine the
overall effectiveness of the fins

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

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