Water is boiled at atmospheric pressure by a horizontal polished copper heating element of diameter D = 5 mm and emissivity ε = 0.05 immersed in water. If the surface temperature of the heating wire is 350°C, determine the heat flux from the wire to the water. The properties of water at the saturation temperature of 100°C are ρl= 957.9 kg/m3 , hfg = 2257.0×10^3J/kg, The properties of vapor at the film temperature ρv = 0.441 kg/m3 , µv =

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Water is boiled at atmospheric pressure by a horizontal polished copper heating element of diameter D = 5 mm and emissivity ε = 0.05 immersed in water. If the surface temperature of the heating wire is 350°C, determine the heat flux from the wire to the water. The properties of water at the saturation temperature of 100°C are ρl= 957.9 kg/m3 , hfg = 2257.0×10^3J/kg, The properties of vapor at the film temperature ρv = 0.441 kg/m3 , µv = 1.73 × 10^-5 kg m/s , Cpv= 1977 J/kg °C, kv = = 0.0357 W/m °C
Select one:
a. 5.94 × 104 W/m2
b. 7.94 × 104 W/m2
c. 3.94 × 104 W/m2
d. 1.94 × 104 W/m2
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