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Answer:
Re=100,000⇒Q=275.25
Re=500,000⇒Q=1,757.77
Re=1,000,000⇒Q=3060.36
Explanation:
Given:
For air =25°C ,V=8 m/s
For surface =179°C
L=2.75 m ,b=3 m
We know that for flat plate
⇒Laminar flow
⇒Turbulent flow
<u> Take Re=100,000:</u>
So this is case of laminar flow
From standard air property table at 25°C
Pr= is 0.71 ,K=26.24
So
Nu=187.32 ()
187.32=
⇒h=1.78
heat transfer rate =h
=275.25
<u> Take Re=500,000:</u>
So this is case of turbulent flow
Nu=1196.18 ⇒h=11.14
heat transfer rate =h
=11.14(179-25)
= 1,757.77
<u> Take Re=1,000,000:</u>
So this is case of turbulent flow
Nu=2082.6 ⇒h=19.87
heat transfer rate =h
=19.87(179-25)
= 3060.36