Three thin hollow cylinders of 100, 200, and 300 mm diame ters are arranged concentrically. If the inner (100 mm diameter) and the outer (300 mm diameter) cylinders are maintained at 727°C and 27°C...

Three thin hollow cylinders of 100, 200, and 300 mm diame ters are arranged concentrically. If the inner (100 mm diameter) and the outer (300 mm diameter) cylinders are maintained at 727°C and 27°C respectively, and assuming vacuum in the annular spaces, estimate the steadystate temperature of the middle cylinder (200 mm diameter). Take
 Determine the rate of heat loss per metre length of the composite cylinder and the convective heat transfer coefficient on the outer surface, if the surrounding air temperature is 10°C.