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Heat Q5 A vertical flat plate (1.5 m) height and (1 m) width ,with uniform temperature (120 oC)...

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Mechanical Engineering

Heat
Q5 A vertical flat plate (1.5 m) height and (1 m) width ,withuniform
temperature (120 oC) one face of this plate expressed to theair with the velocity (6
m/s) to the up direction, the second face expressed to thestatic air ,the temperature
of the air with two side (30oC) . Calculate the heat lossesfrom the plate. The
properties of the air at (75 oC),[ ρ=0.998 kg/m3
.Cp=1.009 kJ/kg.oC, Ï… =2.076 *10-5
m
2
/s , k= 0.03 W/m. k]
Nu)L=0.664(ReL)
0.5 (Pr)0.33
for laminar flow
Nu)L=[0.036(ReL)
4/5
-836] (Pr)0.33
for turbulent flow
For free convection
Nu)L =0.59 (RaL)
0.25
104
< RaL< 109
Nu)L =0.1 (RaL)
0.33
109
< RaL< 1012

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