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HW3: The temperature of a gas stream is measured with a thermocouple. The junction may be...
Problem 10.17 The temperature of a flowing gas stream is measured using a bare thermocouple, which...
Problem 10.17
The temperature of a flowing gas stream is measured using a bare
thermocouple, which is a spherical metal bead 1.2 mm in diameter.
The properties of the metal are: denisty = 8000 kg/m^3, cp=450
J/kgK, and k= 25 W/mK. The film coefficient between the gas and the
metal is 310 W/m^2K. If the gas temperature suddenly changes from
200C to 210C, how long will it take for the thermocouple to reach
209C?
10.17. The temperature of a flowing...
3 Lumpy Junction A thermocouple junction, which may be approximated as a sphere, is to be...
3 Lumpy Junction A thermocouple junction, which may be approximated as a sphere, is to be used for temperature measurement in a gas stream. The convection coefficient between the junction surface and the gas is h = 200 W m-2 K-1. The junction properties are k = 35 W m-1 K-1, c = 500 J kg-1 K-1, and p = 8000 kg m-3. Determine the junction diameter needed for the thermocouple to have a time constant of t = 0.8...
The temperature of a flowing gas is to be measured with a thermocouple junction and wire...
The temperature of a flowing gas is to be measured with a thermocouple junction and wire stretched between two legs of a sting, a wind tunnel test fixture. The junc- tion is formed by butt-welding two wires of different material, as shown in the schematic. For wires of diame- ter D = 125 pm and a convection coefficient of h = 700 W/ m K, determine the minimum separation distance between the two legs of the sting, L=L +L, to...
part B ?? The heat transfer to a thermocouple bead is characterized by a heat transfer coefficient of: h- 100 W/m2C. The thermocouple bead can be approximated by a sphere with the following prope...
part B ??
The heat transfer to a thermocouple bead is characterized by a heat transfer coefficient of: h- 100 W/m2C. The thermocouple bead can be approximated by a sphere with the following properties: Diameter, D = 1 mm, Density, ρ = 10,000 kg/m3, Specific Heat, Cp-1001/kgK. 5. a. Find the time constant, t b. Would you recommend using this thermocouple to make temperature measurements on a system whose temperature is oscillating at 1 Hz?
The heat transfer to a...
In an experiment, the temperature of a hot air sS stream is to be measured by...
In an experiment, the temperature of a hot air sS stream is to be measured by a thermocouple with a spherical junction. Due to the nature of this experiment, the response time of the thermocouple to register 99 percent of the initial temperature difference must be within 5s. The properties of the thermocouple junction are k 35 W/m-K, T 8500 kg/m3, and cp 320 J/kg-K The hot air has a free stream velocity and temperature of 3 m/s and 140°C,...
1. (10 points) A spherical thermocouple junction 1 mm in diameter is inserted in a combustion...
1. (10 points) A spherical thermocouple junction 1 mm in diameter is inserted in a combustion chamber to measure the temperature of the products of combustion. The hot gases are at 1000 K and have a velocity of 5 m/s. The thermocouple junction has an emissivity of 50% and the cooled walls of the combustor are at 500 K. The properties of the thermocouple junction are: p = 9000 kg/m”, Cp = 500 J/kg:K, k = 100 W/mK. The properties...
Problem 3 A portable thermocouple is used to measure the air temperature inside of a sauna....
Problem 3 A portable thermocouple is used to measure the air temperature inside of a sauna. The sauna is unbearably hot and a person can only stay for 20 seconds, during which the temperature reading keeps on changing and a steady temperature is not reached. Leaving the thermocouple reader in the sauna for extended period of time has been deemed too risky for an electronics device Fortunately, a transient heat transfer model can be used to extract the temperature in...
Solve the differential equation analytically Suppose a thermocouple is to be used to measure the temperature of a hot gas flowing through a duct. The thermocouple junction is initially at ambient tem...
Solve the differential equation analytically
Suppose a thermocouple is to be used to measure the temperature of a hot gas flowing through a duct. The thermocouple junction is initially at ambient temperature Ti-25°C before it is inserted into the gas stream. Hot duct wall Tsur 400°C Gas stream Junction, Tt) 1,-25°C, D p 8500 kg/m3 T 200°C 0.7 mm 400 Jkg.K Approximating the thermocouple junction as a sphere and using the lumped capacitance model, an energy balance on the thermocouple...
The temperature of air in a duct is measured by a thermocouple as shown. It's to find the he...
The temperature of air in a duct is measured by a thermocouple
as shown.
It's to find the heat flux of the thermocouple
problem 8.5 Problem 8.5 The temperature of air in a duct is measured by a thermocouple, as shown. The tip of the thermocouple is a d-2 mm diameter sphere of metallic alloy, having thermal conductivity of k-60 W/m-K, and emissivity, 0.6 . The thermocouple wires are thin and long. The duct walls are at T- 130 C....
A thermocouple is used to measure the temperature of hot air flowing in a duct whose...
A thermocouple is used to measure the temperature of hot air flowing in a duct whose walls are maintained at Tw = 500 K. The thermocouple shows a temperature reading of Tt h = 850 K. Assuming the emissivity of the thermocouple junction to be 0.6, and the convection heat transfer coefficient to be 60 W/m2 · K, (a) draw the thermal resistance network, and (b) determine the actual temperature of the air.
Problem 10.17
The temperature of a flowing gas stream is measured using a bare
thermocouple, which is a spherical metal bead 1.2 mm in diameter.
The properties of the metal are: denisty = 8000 kg/m^3, cp=450
J/kgK, and k= 25 W/mK. The film coefficient between the gas and the
metal is 310 W/m^2K. If the gas temperature suddenly changes from
200C to 210C, how long will it take for the thermocouple to reach
209C?
10.17. The temperature of a flowing...
3 Lumpy Junction A thermocouple junction, which may be approximated as a sphere, is to be used for temperature measurement in a gas stream. The convection coefficient between the junction surface and the gas is h = 200 W m-2 K-1. The junction properties are k = 35 W m-1 K-1, c = 500 J kg-1 K-1, and p = 8000 kg m-3. Determine the junction diameter needed for the thermocouple to have a time constant of t = 0.8...
The temperature of a flowing gas is to be measured with a thermocouple junction and wire stretched between two legs of a sting, a wind tunnel test fixture. The junc- tion is formed by butt-welding two wires of different material, as shown in the schematic. For wires of diame- ter D = 125 pm and a convection coefficient of h = 700 W/ m K, determine the minimum separation distance between the two legs of the sting, L=L +L, to...
part B ??
The heat transfer to a thermocouple bead is characterized by a heat transfer coefficient of: h- 100 W/m2C. The thermocouple bead can be approximated by a sphere with the following properties: Diameter, D = 1 mm, Density, ρ = 10,000 kg/m3, Specific Heat, Cp-1001/kgK. 5. a. Find the time constant, t b. Would you recommend using this thermocouple to make temperature measurements on a system whose temperature is oscillating at 1 Hz?
The heat transfer to a...
In an experiment, the temperature of a hot air sS stream is to be measured by a thermocouple with a spherical junction. Due to the nature of this experiment, the response time of the thermocouple to register 99 percent of the initial temperature difference must be within 5s. The properties of the thermocouple junction are k 35 W/m-K, T 8500 kg/m3, and cp 320 J/kg-K The hot air has a free stream velocity and temperature of 3 m/s and 140°C,...
1. (10 points) A spherical thermocouple junction 1 mm in diameter is inserted in a combustion chamber to measure the temperature of the products of combustion. The hot gases are at 1000 K and have a velocity of 5 m/s. The thermocouple junction has an emissivity of 50% and the cooled walls of the combustor are at 500 K. The properties of the thermocouple junction are: p = 9000 kg/m”, Cp = 500 J/kg:K, k = 100 W/mK. The properties...
Problem 3 A portable thermocouple is used to measure the air temperature inside of a sauna. The sauna is unbearably hot and a person can only stay for 20 seconds, during which the temperature reading keeps on changing and a steady temperature is not reached. Leaving the thermocouple reader in the sauna for extended period of time has been deemed too risky for an electronics device Fortunately, a transient heat transfer model can be used to extract the temperature in...
Solve the differential equation analytically
Suppose a thermocouple is to be used to measure the temperature of a hot gas flowing through a duct. The thermocouple junction is initially at ambient temperature Ti-25°C before it is inserted into the gas stream. Hot duct wall Tsur 400°C Gas stream Junction, Tt) 1,-25°C, D p 8500 kg/m3 T 200°C 0.7 mm 400 Jkg.K Approximating the thermocouple junction as a sphere and using the lumped capacitance model, an energy balance on the thermocouple...
The temperature of air in a duct is measured by a thermocouple
as shown.
It's to find the heat flux of the thermocouple
problem 8.5 Problem 8.5 The temperature of air in a duct is measured by a thermocouple, as shown. The tip of the thermocouple is a d-2 mm diameter sphere of metallic alloy, having thermal conductivity of k-60 W/m-K, and emissivity, 0.6 . The thermocouple wires are thin and long. The duct walls are at T- 130 C....
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