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zhannawk [14.2K]
2 years ago
7

Hey answer quick for 20 points

Engineering
2 answers:
SSSSS [86.1K]2 years ago
4 0
Thank you!!!!!!!!!!!!!!!!
creativ13 [48]2 years ago
3 0

Answer:

<h2>Hey.....Thanks but FYI this is only 8 points....If u want to put 20....try putting 40...</h2>
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Pani-rosa [81]

The correct question;

An object of irregular shape has a characteristic length of L = 1 m and is maintained at a uniform surface temperature of Ts = 400 K. When placed in atmospheric air at a temperature of Tinfinity = 300 K and moving with a velocity of V = 100 m/s, the average heat flux from the surface to the air is 20,000 W/m² If a second object of the same shape, but with a characteristic length of L = 5 m, is maintained at a surface temperature of Ts = 400 K and is placed in atmospheric air at Too = 300 K, what will the value of the average convection coefficient be if the air velocity is V = 20 m/s?

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h'_2 = 40 W/K.m²

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We are given;

L1 = 1m

L2 = 5m

T_s = 400 K

T_(∞) = 300 K

V = 100 m/s

q = 20,000 W/m²

Both objects have the same shape and density and thus their reynolds number will be the same.

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Re_L1 = Re_L2

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h'_2 = (h'_1(L1/L2)) = [q/(T_s - T_(∞))]• (L1/L2)

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