An oil preheater consists of a single tube of 10 mm diameter and 5 m length, with
Question:
An oil preheater consists of a single tube of 10 mm diameter and 5 m length, with its surface maintained at 175o C by swirling combustion gases. The engine oil (new) enters at 75o C. What flow rate must be supplied to maintain an oil outlet of 100o C? What is the corresponding heat transfer rate?
Engine oil flows at a rate of I kg/s through a 5-mm-diameter 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 exit of the tube before proceeding with your analysis.
Process Dynamics And Control
ISBN: 978-0471000778
2nd Edition
Authors: Dale E. Seborg, Thomas F. Edgar, Duncan A. Mellich