An alumun um rod 22 cm diameter is screwed at the ends, and passes through a steel tube 2.5 cm internal diameter and 03 em thick Both are heated to a temperature of 140 C, when the nuts on the rod are serewed lghtly on to the ends of the tube Estumate the stress in the tod when the common temperature has fallen to 20 C For steel, 20OGNm and a 12 10 per "C, and for alumanium, E - 70 GN/m and a23 10 per C, where Eis Young's modulus and a as the coefficient of laneat expansion

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Q: True of False? Steel structures are more susceptible to premature failures.

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Temperature Difference and Heat Transfer

Whenever there is a flow of heat flux resulting from a temperature gradient within the material or between two materials, there is heat transfer. Heat transfer primarily arises due to temperature differences between two bodies or within bodies. The term temperature gradient denotes temperature differences or variation of temperature due to change in some quantity. The fundamental use of the concept of temperature is found in the zeroth law of thermodynamics.