Determine the temperature registered by the thermocouple

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Reference no: EM131323841

Heat Transfer Problem -

A thermocouple is to be utilized to measure the temperature of exhaust gases from an automobile engine and the effect of the cylindrical radiation shield installed as shown in the image, is to be investigated. The inner and outer shield diameters are 8mm and 12mm respectively. The emittance of the thermocouple bead and the shields can be taken to be 0.4. If the exhaust gases are at 1200K and the exhaust pipe walls are at 600K determine the temperature registered by the thermocouple for (a) no shield, (ii) one (inner) shield and (iii) two (inner and outer) shields.

Assumptions:

pipe walls are black
neglect the effect of the thermocouple leads
neglect radiation loss through the ends of the shields
neglect entrance flow effects in the shields
assume laminar flow in the shields
heat transfer coefficient on the thermocouple is 300 W/m²K
thermal conductivity of exhaust gases 0.2 W/mK.

Reference no: EM131323841

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