7000kw horizontal oil fired steam boiler for chemical industry

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    6. An oil is acting as a lubricant for a pair of cylindrical surfaces. The angular velocity of the outer cylinder is 7908 rpm. The outlet cylinder has a radius of 5.08 cm and the clearance between the cylinder is 0.027 cm. What is the maximum temperature in the oil if both wall temperature are known to be 70°C.

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