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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...
HW3: The temperature of a gas stream is measured with a thermocouple. The junction may be...
HW3: The temperature of a gas stream is measured with a thermocouple. The junction may be approximated as a sphere of diameter D=1 mm, k=20 W/(mK), p= 7800 kg/m² and Cp=0.4 kJ/(kgK). The heat transfer coefficient between the junction and the gas stream is h=100 W/(m²K). If the initial temperature of the thermocouple 20 C and gas stream temperature is 100 C, what will be reading of the thermocouple after t=10 seconds?
The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing...
The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing the temperature–time history of a sphere fabricated from pure copper. The sphere, which is 20.0 mm in diameter, is at 70°C before it is inserted into the gas stream having a temperature of 27°C. A thermocouple on the outer surface of the sphere indicates 50°C 97 s after the sphere is inserted into the hydrogen. Find a) What is the value of the specific...
The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing...
The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing the temperature–time history of a sphere fabricated from pure copper. The sphere, which is 20.0 mm in diameter, is at 90°C before it is inserted into the gas stream having a temperature of 27°C. A thermocouple on the outer surface of the sphere indicates 40°C 97 s after the sphere is inserted into the hydrogen. Step 1 What is the value of the specific...
2. A separation column at a temperature of 100C is subjected for cooling for a certain...
2. A separation column at a temperature of 100C is subjected
for cooling for a certain period of time. If the separation column
is 1500 mm high and 18 cm in diameter, and eventually exposed to an
environment temperature of 35C, determine the following with a
neat diagram:
a) Heat Transfer Coefficient (in J/s m2C and kJ/s m2C)
b) Heat transfer Rate (in W and kW)
Assume the properties of air at mean temperature as density
(ρ) = 1.06 kg/m3,...
Q3. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a...
Q3. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature of 500 K. The cylinder is cooled by a fan. The fan blow airs, with a temperature of 300 K, over the cylinder at a velocity of 6 m/s in a direction perpendicular to the axis of the cylinder. Calculate a) the average convective heat transfer coefficient at the beginning of the cooling process when the initial temperature of the cylinder is...
1) The convection coefficient, (h) for external convection heat transfer depends on the following (with units...
1) The convection coefficient, (h) for external convection heat transfer depends on the following (with units in SI of Watts/(m2 Kelvin): The characteristic length, L The fluid thermal conductivity, k The average fluid velocity, V The fluid viscosity, μ The fluid density, ρ The fluid specific heat, cp Using the Buckingham Pi Theorem, determine a set of dimensionless groups that can be used to correlate test data for this problem. Please show all of your work for this problem (i.e....
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 "C resulting in the convective coefficient, h = 114 W/m' K. The relevant properties of mild steel are given as follows: Density p= 7850 kg/m . Specific heat c = 475 J/kg K and thermal diffusivity a = 0.043 m/hr Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 °C to 95°C. [7 marks] (ii)...
summatize the following info and break them into differeng key points. write them in yojr own...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
summarizr the followung info and write them in your own words and break them into different...
summarizr the followung info and write them in your own words and break them into different key points. 6.5 Metering Chamber: 6.5.1 The minimum size of the metering box is governed by the metering area required to obtain a representative test area for the specimen (see 7.2) and for maintenance of reasonable test accuracy. For example, for specimens incorporating air spaces or stud spaces, the metering area shall span an integral number of spaces (see 5.5). The depth of...
HW3: The temperature of a gas stream is measured with a thermocouple. The junction may be approximated as a sphere of diameter D=1 mm, k=20 W/(mK), p= 7800 kg/m² and Cp=0.4 kJ/(kgK). The heat transfer coefficient between the junction and the gas stream is h=100 W/(m²K). If the initial temperature of the thermocouple 20 C and gas stream temperature is 100 C, what will be reading of the thermocouple after t=10 seconds?
2. A separation column at a temperature of 100C is subjected
for cooling for a certain period of time. If the separation column
is 1500 mm high and 18 cm in diameter, and eventually exposed to an
environment temperature of 35C, determine the following with a
neat diagram:
a) Heat Transfer Coefficient (in J/s m2C and kJ/s m2C)
b) Heat transfer Rate (in W and kW)
Assume the properties of air at mean temperature as density
(ρ) = 1.06 kg/m3,...
Q3. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature of 500 K. The cylinder is cooled by a fan. The fan blow airs, with a temperature of 300 K, over the cylinder at a velocity of 6 m/s in a direction perpendicular to the axis of the cylinder. Calculate a) the average convective heat transfer coefficient at the beginning of the cooling process when the initial temperature of the cylinder is...
1) The convection coefficient, (h) for external convection heat transfer depends on the following (with units in SI of Watts/(m2 Kelvin): The characteristic length, L The fluid thermal conductivity, k The average fluid velocity, V The fluid viscosity, μ The fluid density, ρ The fluid specific heat, cp Using the Buckingham Pi Theorem, determine a set of dimensionless groups that can be used to correlate test data for this problem. Please show all of your work for this problem (i.e....
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 "C resulting in the convective coefficient, h = 114 W/m' K. The relevant properties of mild steel are given as follows: Density p= 7850 kg/m . Specific heat c = 475 J/kg K and thermal diffusivity a = 0.043 m/hr Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 °C to 95°C. [7 marks] (ii)...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
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