A pin fin of uniform cross-sectional area is fabricated of an aluminum alloy (k = 160W m-1 K-1 ). The fin diameter is D = 4 mm,
and the fin is exposed to convective conditions characterized by h = 220W m-2 K-1 . It is reported that the fin efficiency is ?f = 0.65. Account for convection heat transfer at the fin tip.
Questions: (a) What is the length of the fin, L?
(b) What is the fin effectiveness ?f?
Questions: (a) What is the length of the fin, L?
(b) What is the fin effectiveness ?f?
1 answer:
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Answer:
The temperature T= 648.07k
Explanation:
T1=input temperature of the first heat engine =1400k
T=output temperature of the first heat engine and input temperature of the second heat engine= unknown
T3=output temperature of the second heat engine=300k
but carnot efficiency of heat engine =
where Th =temperature at which the heat enters the engine
Tl is the temperature of the environment
since both engines have the same thermal capacities <em> </em> therefore
We have now that
multiplying through by T
multiplying through by 300
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The temperature T= 648.07k
Answer:
Explanation:
Density is defined as mass ler unit volume, expressed as
Where m is mass, is density and v is the volume. For a sphere, volume is given as
Replacing this into the formula of density then
Given diameter of 2.24 in then the radius is 1.12 in. Substituting 0.82 lb for m then