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An uninsulated metal sphere with a diameter of 1 cm has a surface temperature of 30...
8. An uninsulated steam pipe is used to transport high-temperature steam from one build- ing to...
8. An uninsulated steam pipe is used to transport high-temperature steam from one build- ing to another. The pipe is 0.5 m in diameter, has a surface temperature of 150°C, and is exposed to ambient air at -10°C. The air moves in cross flow over the pipe with a velocity of 5 m/s. What is the rate of heat loss per unit length of pipe?
HEAT TRANSFER 2. A steam pipe, 12 m in length and 10 cm in diameter, is...
HEAT TRANSFER 2. A steam pipe, 12 m in length and 10 cm in diameter, is exposed to the cross flow of air at 5°C with the velocity of 25 km/h. The surface of the pipe is maintained at 75°C and its emissivity is estimated to be 0.8. The surrounding temperature is at 0°C. Determined the total heat loss from the pipe.
use dimensionless equations Problem 1 A pipe of outside diameter d=30 mm is exposed to the...
use dimensionless equations
Problem 1 A pipe of outside diameter d=30 mm is exposed to the cross air flow at 20°C, velocity of the air is 5 m/s, and the temperature of the outside surface of the pipe is 80 °C. Determine: a) An average coefficient of heat transfer from outside surface of the pipe to the air. b) The heat flux exchanged per unit length of the pipe.
A. An electrostatic paint sprayer has a 0.17 m-diameter metal sphere at a potential of 25.0 kV...
A. An electrostatic paint sprayer has a 0.17 m-diameter metal sphere at a potential of 25.0 kV that repels paint droplets onto a grounded object. What charge must a 0.1 µg drop of paint have to arrive at the grounded object (at 0 volts) with a speed of 12 m/s? Assume the paint drop is initially at the surface of the metal sphere with zero velocity. You may ignore gravitational potential energy (but not electric potential energy!). B. Two-point charges are...
1-60 A hollow spherical iron container with outer diameter 20 cm and thickness 0.2 cm is...
1-60 A hollow spherical iron container with outer diameter 20 cm and thickness 0.2 cm is filled with iced water at 0°C. If the outer surface temperature is 5°C, determine the approximate rate of heat loss from the sphere, in kW, and the rate at which ice melts in the container. The heat of fusion of water is 333.7 kJ/kg. Iced water 0.2 cm FIGURE P1-60
S A 10-m-long section of an 8 cm (r=4 cm) of external diameter horizontal steam water...
S A 10-m-long section of an 8 cm (r=4 cm) of external diameter horizontal steam water pipe passes through a large room whose temperature is To =15°C. The pipe is insulated with an insulating material of conductivity k=0.01 W/m-°C and 1 cm thick. If the inner surface temperature of the pipe is 95 °C (at r2) and the pipe is exposed to a cross wind of 6.0 m/s, determine the rate of heat loss from the pipe (neglect radiation). Thermal...
Air at 25°C flows over a 10-mm-diameter sphere with a velocity of 30 m/s, while the...
Air at 25°C flows over a 10-mm-diameter sphere with a velocity of 30 m/s, while the surface of the sphere is maintained at 75°C. What is the rate of heat transfer from the sphere?
3. Consider a cylinder of 20 mm in diameter (D) and 100 mm in length (L)...
3. Consider a cylinder of 20 mm in diameter (D) and 100 mm in length (L) that is installed in a duct. Air moves in cross flow over the side surface of the cylinder at a temperature (To) and velocity (V) of 33.7 C and 30 m/s, respectively. If the average cylinder surface temperature (T) is maintained at 120°C, what is the required power generation of the cylinder? Note: (1) Air properties can be found from Table A.4 in the...
Al m diameter sphere is exposed to an en covered with a layer of insulation 2.5...
Al m diameter sphere is exposed to an en covered with a layer of insulation 2.5 cm thick whose thermal conductivity temperature of the sphere on the inside of the insulation is 315ºC. Assuming emissivity of 0.9, compute the value of the conve 's compute the value of the convection heat transfer coefficient that must be maintained on the outer surface of the insulation to ensure that the outer surface not exceed 41°C. exposed to an environmental temperature of 28°C....
One end of a long rod 3 cm in diameter is inserted into a furnace with the
One end of a long rod 3 cm in diameter is inserted into a furnace with the (3 outer end projecting into the outside air. Once the steady state is reached the temperature of the rod is measured at two points, 15 cm apart and found to be 140°C and 100°C, when the atmospheric air is at 30°C with convection coefficient of 20 W/m2.K. Calculate the thermal conductivity of *.the rod material Consider a stainless steel spoon(k = 15.1 W/m.K), partially...
8. An uninsulated steam pipe is used to transport high-temperature steam from one build- ing to another. The pipe is 0.5 m in diameter, has a surface temperature of 150°C, and is exposed to ambient air at -10°C. The air moves in cross flow over the pipe with a velocity of 5 m/s. What is the rate of heat loss per unit length of pipe?
HEAT TRANSFER 2. A steam pipe, 12 m in length and 10 cm in diameter, is exposed to the cross flow of air at 5°C with the velocity of 25 km/h. The surface of the pipe is maintained at 75°C and its emissivity is estimated to be 0.8. The surrounding temperature is at 0°C. Determined the total heat loss from the pipe.
use dimensionless equations
Problem 1 A pipe of outside diameter d=30 mm is exposed to the cross air flow at 20°C, velocity of the air is 5 m/s, and the temperature of the outside surface of the pipe is 80 °C. Determine: a) An average coefficient of heat transfer from outside surface of the pipe to the air. b) The heat flux exchanged per unit length of the pipe.
1-60 A hollow spherical iron container with outer diameter 20 cm and thickness 0.2 cm is filled with iced water at 0°C. If the outer surface temperature is 5°C, determine the approximate rate of heat loss from the sphere, in kW, and the rate at which ice melts in the container. The heat of fusion of water is 333.7 kJ/kg. Iced water 0.2 cm FIGURE P1-60
S A 10-m-long section of an 8 cm (r=4 cm) of external diameter horizontal steam water pipe passes through a large room whose temperature is To =15°C. The pipe is insulated with an insulating material of conductivity k=0.01 W/m-°C and 1 cm thick. If the inner surface temperature of the pipe is 95 °C (at r2) and the pipe is exposed to a cross wind of 6.0 m/s, determine the rate of heat loss from the pipe (neglect radiation). Thermal...
3. Consider a cylinder of 20 mm in diameter (D) and 100 mm in length (L) that is installed in a duct. Air moves in cross flow over the side surface of the cylinder at a temperature (To) and velocity (V) of 33.7 C and 30 m/s, respectively. If the average cylinder surface temperature (T) is maintained at 120°C, what is the required power generation of the cylinder? Note: (1) Air properties can be found from Table A.4 in the...
Al m diameter sphere is exposed to an en covered with a layer of insulation 2.5 cm thick whose thermal conductivity temperature of the sphere on the inside of the insulation is 315ºC. Assuming emissivity of 0.9, compute the value of the conve 's compute the value of the convection heat transfer coefficient that must be maintained on the outer surface of the insulation to ensure that the outer surface not exceed 41°C. exposed to an environmental temperature of 28°C....
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