A 5-m-long strip of sheet metal is being transported on a conveyor at a velocity of 5 m/s, while the coating on the upper surface is being cured by infrared lamps. The coating on the upper surface of the metal strip has an absorptivity of 0.6 and an emissivity of 0.7, while the surrounding ambient air temperature is 25°C. Radiation heat transfer occurs only on the upper surface, while convection hea transfer occurs on both upper and lower surfaces of the sheet metal. If the infrared lamps supply a constant heat flux of 4950 W/m2. determine the surface temperature of the sheet metal. Evaluate the properties of air at 80°C. The properties of air at 80°C are k= 0.02953 W/m K, v= 2.097 × 10-5 m²/s, and Pr = 0.7154. (Round the final answer to the nearest whole number,.) The surface temperature (Ts) of the sheet metal is | |K.

Elements Of Electromagnetics
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A 5-m-long strip of sheet metal is being transported on a conveyor at a velocity of 5 m/s, while the coating on the upper surface is
being cured by infrared lamps. The coating on the upper surface of the metal strip has an absorptivity of 0.6 and an emissivity of 0.7,
while the surrounding ambient air temperature is 25°C. Radiation heat transfer occurs only on the upper surface, while convection hea
transfer occurs on both upper and lower surfaces of the sheet metal. If the infrared lamps supply a constant heat flux of 4950 W/m2,
determine the surface temperature of the sheet metal. Evaluate the properties of air at 80°C. The properties of air at 80°C are k=
0.02953 W/m-K, v= 2.097 x 10-5 m2/s, and Pr = 0.7154. (Round the final answer to the nearest whole number.)
The surface temperature (Ts) of the sheet metal is
|K.
Transcribed Image Text:A 5-m-long strip of sheet metal is being transported on a conveyor at a velocity of 5 m/s, while the coating on the upper surface is being cured by infrared lamps. The coating on the upper surface of the metal strip has an absorptivity of 0.6 and an emissivity of 0.7, while the surrounding ambient air temperature is 25°C. Radiation heat transfer occurs only on the upper surface, while convection hea transfer occurs on both upper and lower surfaces of the sheet metal. If the infrared lamps supply a constant heat flux of 4950 W/m2, determine the surface temperature of the sheet metal. Evaluate the properties of air at 80°C. The properties of air at 80°C are k= 0.02953 W/m-K, v= 2.097 x 10-5 m2/s, and Pr = 0.7154. (Round the final answer to the nearest whole number.) The surface temperature (Ts) of the sheet metal is |K.
Air at 20°C (1 atm) is flowing over a 0.025-m diameter sphere with a velocity of 3.5 m/s. If the surface temperature of the sphere is
constant at 80°C, determine the Reynolds number corresponding to the sphere, its average drag co-efficient, and the heat transfer rate
from the sphere. The properties of air (1 atm) at the free stream temperature To = 20°C, p = 1.204 kg/m3, k= 0.02514 W/m-K, u = 1.825
x 10-5 kg/m-s, and Pr = 0.7309. At the surface temperature T= 80°C: Hs = 2.096 x 10-5 kg/m-s. At the film temperature Tf= (80°C +
20°C)/2 = 50°C: p = 1.092 kg/m³ and v= 1.798 x 10-5 m2/s. (Round the Reynolds number to the nearest whole number and other
answers to two decimal places.)
its average drag co-efficient is
The Reynolds number corresponding to the sphere is
from the sphere is
and the heat transfer rate
W.
Transcribed Image Text:Air at 20°C (1 atm) is flowing over a 0.025-m diameter sphere with a velocity of 3.5 m/s. If the surface temperature of the sphere is constant at 80°C, determine the Reynolds number corresponding to the sphere, its average drag co-efficient, and the heat transfer rate from the sphere. The properties of air (1 atm) at the free stream temperature To = 20°C, p = 1.204 kg/m3, k= 0.02514 W/m-K, u = 1.825 x 10-5 kg/m-s, and Pr = 0.7309. At the surface temperature T= 80°C: Hs = 2.096 x 10-5 kg/m-s. At the film temperature Tf= (80°C + 20°C)/2 = 50°C: p = 1.092 kg/m³ and v= 1.798 x 10-5 m2/s. (Round the Reynolds number to the nearest whole number and other answers to two decimal places.) its average drag co-efficient is The Reynolds number corresponding to the sphere is from the sphere is and the heat transfer rate W.
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