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Q.8. Super-heated steam at 875 K is flowing through a thick walled tube of stainless tube...

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Mechanical Engineering

Q.8. Super-heated steam at 875 K is flowing through a thickwalled tube of stainless tube with inside diameter 40mm and outsidediameter50mm such that its inner wall is heated to a uniformtemperature of 875K.To reduce heat loss, the tube is lagged with30mm layer of asbestos insulation k=0.2 W/m.K. Calculate the heatloss using the electrical analogy per metre length if the outersurface temperature of the insulated tube is 350K.Thermalconductivity of steel=19 W/m.k.

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