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 rate of heat transfer from the wire to the water per unit length of the wire. 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 °CSelect one:a. 853 Wb. 933 Wc. 707 Wd. 1953 W Water is boiled at atmospheric pressureby a horizontal polished copper heatingelement of diameter D = 5 mm andemissivity ɛ = 0.05 immersed in water. Ifthe surface temperature of the heatingwire is 350°C, determine the rate of heattransfer from the wire to the water perunit length of the wire. The properties ofwater at the saturation temperature of100°C are pl= 957.9 kg/m3 , hfg =2257.0x10^3J/kg, The properties ofvapor at the film temperature pv = 0.441kg/m3 , µv = 1.73 × 10^-5 kg m/s , Cpv=1977 J/kg °C, kv = = 0.0357 W/m °CSelect one:a. 853 Wb. 933 Wc. 707 Wd. 1953 W12:54 am

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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 rate of heat transfer from the wire to the water per unit length of the wire. 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. 853 W b. 933 W c. 707 W d. 1953 W

Water is boiled at atmospheric pressure
by a horizontal polished copper heating
element of diameter D = 5 mm and
emissivity ɛ = 0.05 immersed in water. If
the surface temperature of the heating
wire is 350°C, determine the rate of heat
transfer from the wire to the water per
unit length of the wire. The properties of
water at the saturation temperature of
100°C are pl= 957.9 kg/m3 , hfg =
2257.0x10^3J/kg, The properties of
vapor at the film temperature pv = 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. 853 W
b. 933 W
c. 707 W
d. 1953 W
12:54 am

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