image Guest

You need to login to ask any Questions from chapter Transient-(Unsteady-State-Heat-Conduction) of Heat-Transfer

Chapter:

Transient-(Unsteady-State-Heat-Conduction)

A rmocouple junction of spherical form is to be used to measure temperature of gas stream. The junction is at 20 degree Celsius and is placed in a gas stream which is at 200 degree Celsius. Make calculations for junction diameter needed for rmocouple to have rmal time constant of one second. Assume rmos-physical properties as given below
k = 20 W/ m K
h = 350 W/m2 K
c = 0.4 k J/kg K
p = 8000 kg/m3


Hint Answer

Previous Question
Next Question

All Chapters

View all Chapter and number of question available From each chapter from Heat-Transfer

Similar Question

This Chapter Transient-(Unsteady-State-Heat-Conduction) consists of the following topics

A centrifugal pump which circulates a hot liquid metal at 500 degree Celsius is driven by a 3600 rpm electric motor. The motor is coupled to the pump impeller by a horizontal steel shaft of dia 25 mm. Let us assume the motor temperature as 60 degree Celsius with the ambient air at 25 degree Celsius, what length of shaft should be specified between the motor and the pump? It may be presumed that the thermal conductivity of the shaft material is 35W/m K and that the convective film coefficient between the steel shaft and the ambient air is 15.7W/square m K

A rmocouple junction of spherical form is to be used to measure temperature of gas stream. The junction is at 20 degree Celsius and is placed in a gas stream which is at 200 degree Celsius. Make calculations for junction diameter needed for rmocouple to have rmal time constant of one second. Assume rmos-physical properties as given below
k = 20 W/ m K
h = 350 W/m2 K
c = 0.4 k J/kg K
p = 8000 kg/m3

A low value of time constant can be achieved for a thermocouple by
(i) Increasing the wire diameter
(ii) Increasing the value heat transfer coefficient
(iii) Use light metals of low density and low specific heat

A thermocouple junction of spherical form is to be used to measure the temperature of the gas stream. The junction is at 20 degree Celsius and is placed in a gas stream which is at 200 degree Celsius. Make calculations for junction diameter needed for the thermocouple to have thermal time constant of one second. Assume the thermos-physical properties as given below k = 20 W/ m K h = 350 W/m2 K c = 0.4 k J/kg K p = 8000 kg/m3

Transient (Unsteady State Heat Conduction)

Heat-Transfer