Engine oil flows at a rate of 1 kg/s through a 5-mmdiameter straight tube. The oil has an inlet temperature of 45°C and it is desired to heat the oil to a mean temperature of 80°C at the exit of the tube. The surface of the tube is maintained at 150°C. Determine the required length of the tube. Hint: Calculate the Reynolds numbers at the entrance and

length of tube = 4.12 m

Explanation:

Given data:

flow rate of engine oil = 1 kg/s

diameter of tube = 5-mm

inlet temperature of oil = 45°C

exit temperature of oil = 80°C

surface temperature of tube = 150°C

Determine the required length of the tube

attached below is a detailed solution to the given problem

length of tube = 4.12 m

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