Example 4.13. A thermocouple junction is in the form of 8 mm diameter sphere. Properties of material are: C = 420 J/kg°C; p = 8000 kg/m2; k = 40 W/m°C and h = 40 W/m2°C. %3D This junction is initially at 40°C and inserted in a stream of hot air at 300°C. Find: (i) Time constant of the thermocouple; (ii) The thermocouple is taken out from the hot air after 10 seconds and kept in still air at 30°C. Assuming the heat transfer coefficient in air 10 W/m2° C, find the temperature attained by the junction 20 seconds after removing from hot air. (P.U.)
Example 4.13. A thermocouple junction is in the form of 8 mm diameter sphere. Properties of material are: C = 420 J/kg°C; p = 8000 kg/m2; k = 40 W/m°C and h = 40 W/m2°C. %3D This junction is initially at 40°C and inserted in a stream of hot air at 300°C. Find: (i) Time constant of the thermocouple; (ii) The thermocouple is taken out from the hot air after 10 seconds and kept in still air at 30°C. Assuming the heat transfer coefficient in air 10 W/m2° C, find the temperature attained by the junction 20 seconds after removing from hot air. (P.U.)
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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