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Steam at 250°C flows in a stainless steel pipe (k = 15 W/m-K) whose inner and outer diameters are 4 cm and 4.6 cm, respectively. The pipe is covered with 3.5-cm thick glass wool insulation (k = 0.038 W/m-K) whose outer surface has an emissivity of 0.3. Heat is lost to the surrounding air and surfaces at 3°C by convection and radiation. Taking the heat transfer coefficient inside the pipe to be 80 w/m2.K, determine the surface temperature, when the length of the pipe is 1.8 m and when air is flowing across the pipe at 8 m/s. Evaluate the air properties at a film temperature of 10°C and 1 atm. Assuming a film temperature of 10°C and the properties of air based on this temperature are k= 0.02439 W/m. °C, v= 1.426 x 10-5 m²/s, Pr = 0.7336. The surface temperature is

Steam at 250°C flows in a stainless steel pipe (k = 15 W/m-K) whose inner and outer diameters are 4 cm and 4.6 cm, respectively. The pipe is covered with 3.5-cm thick glass wool insulation (k = 0.038 W/m-K) whose outer surface has an emissivity of 0.3. Heat is lost to the surrounding air and surfaces at 3°C by convection and radiation. Taking the heat transfer coefficient inside the pipe to be 80 w/m2.K, determine the surface temperature, when the length of the pipe is 1.8 m and when air is flowing across the pipe at 8 m/s. Evaluate the air properties at a film temperature of 10°C and 1 atm. Assuming a film temperature of 10°C and the properties of air based on this temperature are k= 0.02439 W/m. °C, v= 1.426 x 10-5 m²/s, Pr = 0.7336. The surface temperature is

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Steam at 250°C flows in a stainless steel pipe (k = 15 W/m-K) whose inner and outer diameters are 4 cm and 4.6 cm, respectively. The pipe is covered with 3.5-cm thick glass wool insulation (k = 0.038 W/m-K) whose outer surface has an emissivity of 0.3. Heat is lost to the surrounding air and surfaces at 3°C by convection and radiation. Taking the heat transfer coefficient inside the pipe to be 80 W/m2.K, determine the surface temperature, when the length of the pipe is 1.8 m and when air is flowing across the pipe at 8 m/s. Evaluate the air properties at a film temperature of 10°C and 1 atm. Assuming a film temperature of 10°C and the properties of air based on this temperature are k = 0.02439 W/m °C, v= 1.426 x 10-5 m²/s, Pr = 0.7336. The surface temperature is °C.
Transcribed Image Text:Steam at 250°C flows in a stainless steel pipe (k = 15 W/m-K) whose inner and outer diameters are 4 cm and 4.6 cm, respectively. The pipe is covered with 3.5-cm thick glass wool insulation (k = 0.038 W/m-K) whose outer surface has an emissivity of 0.3. Heat is lost to the surrounding air and surfaces at 3°C by convection and radiation. Taking the heat transfer coefficient inside the pipe to be 80 W/m2.K, determine the surface temperature, when the length of the pipe is 1.8 m and when air is flowing across the pipe at 8 m/s. Evaluate the air properties at a film temperature of 10°C and 1 atm. Assuming a film temperature of 10°C and the properties of air based on this temperature are k = 0.02439 W/m °C, v= 1.426 x 10-5 m²/s, Pr = 0.7336. The surface temperature is °C.
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