Consider temperature measurement of a very hot gas flowing i

Consider temperature measurement of a very hot gas flowing inside a tube, using a thermometer.

a) what will be the effect of radiation on measured temperature?

b) which physical characterisitic of the thermometer (in the above case) would be most significant if radiation effects are to be minimized?

Solution

a) The radiation will lead to increase in measured temperature.

b) The emissivity of the thermometer body would be most significant if radiation effects are to be minimized.