Question: Engine oil is heated by flowing through a circular tube of diameter D = 50 mm and length L = 25 m and whose surface

Engine oil is heated by flowing through a circular tube of diameter D = 50 mm and length L = 25 m and whose surface is maintained at 150°C.

(a) If the flow rate and inlet temperature of the oil are 0.5 kg/s and 20°C, what is the outlet temperature

Tm,o? What is the total heat transfer rate q for the tube?

(b) For flow rates in the range 0.5 < m < 2.0 kg/s, compute and plot the variations of Tm,o and q with m. For what flow rate(s) are q and Tm,o maximized? Explain your results.

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