A cylindrical metal can, 0.1 m high and 0.05 m in diameter, contains liquid helium at...
A cylindrical metal can, 0.1 m high and 0.05 m in diameter, contains liquid helium at its normal boiling point of -452.074 degree Fahrenheit. At this temperature Helium's heat of vaporization is 20.4 kJ/kg. The walls of the helium container are 1.2 cm thick and have a thermal conductivity of 13.889 W/(m K). The helium container is surrounded by liquid nitrogen at a temperature of -327.64 degrees Fahrenheit.
a) What is the conductive surface area of the metal cylinder?
b) What is the temperature of the liquid helium in Kelvin?
c) What is the temperature of the walls in Kelvin?
d) What is the rate of heat flow into the Helium due to conduction?
e) How much Helium is lost per hour due to conduction?
Homework Answers
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A cylindrical metal can, 0.1 m high and 0.05 m in diameter,
contains liquid helium at...
A cylindrical metal can, 0.1 m high and 0.05 m in diameter, contains liquid helium at...
A cylindrical metal can, 0.1 m high and 0.05 m in diameter, contains liquid helium at its normal boiling point of -452.074 degree Fahrenheit. At this temperature Helium's heat of vaporization is 20.4 kJ/kg. The walls of the helium container are 1.2 cm thick and have a thermal conductivity of 13.889 W/(m K). The helium container is surrounded by liquid nitrogen at a temperature of -327.64 degrees Fahrenheit. a) What is the conductive surface area of the metal cylinder? b)...
Liquid helium us stored in container fitted with 7.00-cm -thick "superinsulation" consisting of numerous lavers of...
Liquid helium us stored in container fitted with 7.00-cm -thick "superinsulation" consisting of numerous lavers of very thin aluminized Mylar sheets. The rate of evaporation of liquid helium in a 200-L container is about 0.700 L per day when the container is stored at room temperature (20 degree C). The density of liquid helium is 0.125 kg/L and the latent heat of vaporization is 21.0 kJ/kg. Estimate the thermal conductivity of the superinsulation. You are in charge of transporting a...
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitroge...
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm....
Liquid nitrogen can be used to cool down objects. The following data of liquid nitrogen and...
Liquid nitrogen can be used to cool down objects. The following data of liquid nitrogen and nitrogen gas can be used around its boiling point: Furthermore, it is given that the molar heat capacity of N_2 (g) is 29.0 J/K, which Is constant over the considered temperature range for N_2 in gas phase. Calculate the boiling point of nitrogen at atmospheric pressure. What is the molar heat of vaporization for N2 at the boiling point and atmospheric pressure? 2.0 moles...
PLEASE ANSWER a,b,c Heat Conduction Heat conduction occurs through any material, represented here by a rectangular...
PLEASE ANSWER a,b,c
Heat Conduction Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the...
Temperatures of gases inside the combustion chamber of a four-stroke automobile engine can reach up to...
Temperatures of gases inside the combustion chamber of a four-stroke automobile engine can reach up to 1000℃. To remove this enormous amount of heat, the engine utilizes a closed liquid- cooled system which relies on conduction to transfer heat from the engine block into the liquid and then into the atmosphere by flowing coolant around the outside surface of each cylinder Assume you have a 4-cylinder engine, and each cylinder has a diameter of 8.00 cm and height of 11.9...
Combined convection and conduction It is desired to transport liquid metal through a pipe embedded in...
Combined convection and conduction It is desired to transport liquid metal through a pipe embedded in a 1.2 m thick wall (k =1.2 W/m.k) at point (x) where the temperature is 650 K. The inside surface of the wall is maintained at 950 K. The outside wall is exposed to air at 300 K with a convective heat transfer coefficient of 10 W/m^2.K. Sketch the system. Calculate the temperature of the outside wall? Calculate the heat flux through the wall?...
Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or...
Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the thickness d. Q kA (T2-T)...
Temperatures of gases inside the combustion chamber of a four-stroke automobile engine can reach up to...
Temperatures of gases inside the combustion chamber of a four-stroke automobile engine can reach up to 1000℃. To remove this enormous amount of heat, the engine utilizes a closed liquid- cooled system which relies on conduction to transfer heat from the engine block into the liquid and then into the atmosphere by flowing coolant around the outside surface of each cylinder. Assume you have a 6-cylinder engine, and each cylinder has a diameter of 9.50 cm and height of 12.2...
- 10 cm Problem 4 A l-m diameter cylindrical container contains a liquid with a specific...
- 10 cm Problem 4 A l-m diameter cylindrical container contains a liquid with a specific gravity of 1.2 to a depth of 0.50 m. A cube of wood which is 10-cm on each side and with a density of 700 kg/m is placed in the cylinder as shown. Determine (a) what percentage of the cube is submerged; and (b) the new depth of liquid, h, in the container. 10 cm NOT TO SCALE
Liquid helium us stored in container fitted with 7.00-cm -thick "superinsulation" consisting of numerous lavers of very thin aluminized Mylar sheets. The rate of evaporation of liquid helium in a 200-L container is about 0.700 L per day when the container is stored at room temperature (20 degree C). The density of liquid helium is 0.125 kg/L and the latent heat of vaporization is 21.0 kJ/kg. Estimate the thermal conductivity of the superinsulation. You are in charge of transporting a...
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm....
Liquid nitrogen can be used to cool down objects. The following data of liquid nitrogen and nitrogen gas can be used around its boiling point: Furthermore, it is given that the molar heat capacity of N_2 (g) is 29.0 J/K, which Is constant over the considered temperature range for N_2 in gas phase. Calculate the boiling point of nitrogen at atmospheric pressure. What is the molar heat of vaporization for N2 at the boiling point and atmospheric pressure? 2.0 moles...
PLEASE ANSWER a,b,c
Heat Conduction Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the...
Temperatures of gases inside the combustion chamber of a four-stroke automobile engine can reach up to 1000℃. To remove this enormous amount of heat, the engine utilizes a closed liquid- cooled system which relies on conduction to transfer heat from the engine block into the liquid and then into the atmosphere by flowing coolant around the outside surface of each cylinder Assume you have a 4-cylinder engine, and each cylinder has a diameter of 8.00 cm and height of 11.9...
Combined convection and conduction It is desired to transport liquid metal through a pipe embedded in a 1.2 m thick wall (k =1.2 W/m.k) at point (x) where the temperature is 650 K. The inside surface of the wall is maintained at 950 K. The outside wall is exposed to air at 300 K with a convective heat transfer coefficient of 10 W/m^2.K. Sketch the system. Calculate the temperature of the outside wall? Calculate the heat flux through the wall?...
Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the thickness d. Q kA (T2-T)...
Temperatures of gases inside the combustion chamber of a four-stroke automobile engine can reach up to 1000℃. To remove this enormous amount of heat, the engine utilizes a closed liquid- cooled system which relies on conduction to transfer heat from the engine block into the liquid and then into the atmosphere by flowing coolant around the outside surface of each cylinder. Assume you have a 6-cylinder engine, and each cylinder has a diameter of 9.50 cm and height of 12.2...
- 10 cm Problem 4 A l-m diameter cylindrical container contains a liquid with a specific gravity of 1.2 to a depth of 0.50 m. A cube of wood which is 10-cm on each side and with a density of 700 kg/m is placed in the cylinder as shown. Determine (a) what percentage of the cube is submerged; and (b) the new depth of liquid, h, in the container. 10 cm NOT TO SCALE
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