7-92 FES A thermocouple with a spherical junction diameterof 1 mm is used for measuring the temperature ofa hydrogen gas stream. The properties of the thermocouplejunction are k = 35 W/m-K, p = 8500 kg/m³, andc, = 320 J/kg-K. The hydrogen gas, behaving as an ideal gasCpat 1 atm, has a free stream temperature of 200°C. If the initialtemperature of the thermocouple junction is 10°C, evaluate thetime for the thermocouple to register 99 percent of the initialtemperature difference at different free stream velocities of thehydrogen gas. Using the EES (or other) software, perform theevaluation by varying the free stream velocity from 1 to100 m/s. Then, plot the thermocouple response time and theconvection heat transfer coefficient as a function of free streamvelocity. Hint: Use the lumped system analysis to determinethe time required for the thermocouple to register 99 percent ofthe initial temperature difference (verify application of thismethod to this problem).H2 gas flow, VT, hThermocouple junctionD=1 mmFIGURE P7-921111

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EES |of 1 mm is used for measuring the temperature of a hydrogen gas stream. The properties of the thermocouple unction are k = 35 W/m·K, p = 320 J/kg-K. The hydrogen gas, behaving as an ideal gas at 1 atm, has a free stream temperature of 200°C. If the initial emperature of the thermocouple junction is 10°C, evaluate the ime for the thermocouple to register 99 percent of the initial emperature difference at different free stream velocities of the nydrogen gas. Using the EES (or other) software, perform the evaluation by varying the free stream velocity from 1 to 100 m/s. Then, plot the thermocouple response time and the 8500 kg/m?, and %3D convection heat transfer coefficient as a function of free stream velocity. Hint: Use the lumped system analysis to determine he time required for the thermocouple to register 99 percent of he initial temperature difference (verify application of this method to this problem).

EES |of 1 mm is used for measuring the temperature of a hydrogen gas stream. The properties of the thermocouple unction are k = 35 W/m·K, p = 320 J/kg-K. The hydrogen gas, behaving as an ideal gas at 1 atm, has a free stream temperature of 200°C. If the initial emperature of the thermocouple junction is 10°C, evaluate the ime for the thermocouple to register 99 percent of the initial emperature difference at different free stream velocities of the nydrogen gas. Using the EES (or other) software, perform the evaluation by varying the free stream velocity from 1 to 100 m/s. Then, plot the thermocouple response time and the 8500 kg/m?, and %3D convection heat transfer coefficient as a function of free stream velocity. Hint: Use the lumped system analysis to determine he time required for the thermocouple to register 99 percent of he initial temperature difference (verify application of this method to this problem).

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

7-92 FES A thermocouple with a spherical junction diameter
of 1 mm is used for measuring the temperature of
a hydrogen gas stream. The properties of the thermocouple
junction are k = 35 W/m-K, p = 8500 kg/m³, and
c, = 320 J/kg-K. The hydrogen gas, behaving as an ideal gas
Cp
at 1 atm, has a free stream temperature of 200°C. If the initial
temperature of the thermocouple junction is 10°C, evaluate the
time for the thermocouple to register 99 percent of the initial
temperature difference at different free stream velocities of the
hydrogen gas. Using the EES (or other) software, perform the
evaluation by varying the free stream velocity from 1 to
100 m/s. Then, plot the thermocouple response time and the
convection heat transfer coefficient as a function of free stream
velocity. Hint: Use the lumped system analysis to determine
the time required for the thermocouple to register 99 percent of
the initial temperature difference (verify application of this
method to this problem).
H2 gas flow, V
T, h
Thermocouple junction
D=1 mm
FIGURE P7-92
1111

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