Engineering, 04.05.2021 01:00, sindy35111
Question 4
A steel rod of 20 mm diameter passes centrally through a copper tube of 50 mm external diameter
and 40 mm internal diameter. The tube is closed at each end by rigid plates of negligible thickness.
The nuts are tightened lightly home on the projecting parts of the rod. If the temperature of the
assembly is raised by 50°C, calculate the stresses developed in copper and steel. Take E for steel
and copper as 200 GN/m² and 100 GN/m² and α for steel and copper as 12x 10-6
per °C and 18 x
10-6
per °C
Answers: 3
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Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.
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Question 4
A steel rod of 20 mm diameter passes centrally through a copper tube of 50 mm external...
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