Around bar of chromium steel, (ρ= 7833 kg/m, k =48.9 w/m-k, c =0.115 kj/kg-k, α=3.91 ×10^-6 m^2/s) emerges from a heat treatment process at 285°c and is quenched by an air stream at 15 m/s and at 35°c. the bar has a diameter of 40 cm and is 200 cm long. determine the initial rate of heat

Q = 424523.22 kw

Explanation:

k = 48.9 W/m - K

c = 0.115 KJ/kg- K

T_∞ = 35 degree celcius

velocity of air stream = 15 m/s

D = 40 cm

L = 200 cm

mass flow rate

solving for h

h = 675.6 kw/m^2K

Q = 675.6*2.513*(285-35)

Q = 424523.22 kw

answer:

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