Assignment 1 - material balancea platinum wire of length, Ask an Expert

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Assignment 1 - Material Balance

A platinum wire of length 0.5m and diameter 1mm conducts a current of 10A. The ambient temperature is 20oC, and the heat transfer coefficient at the surface of the wire is 20 W.m-2.K-1. The thermal conductivity of platinum is 47 W.m-1.K-1 and the specific resistivity is 10.6 ??.cm. Calculate:

(a) The temperatures at the centreline and the surface of the wire
(b) The wire is coated with a 1 mm layer of plastic insulating material of km = 0.1W.m-1.K-1. Calculate the temperature at the inner and outer surfaces of the insulation.

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