Unused engine oil with a 100?C inlet temperature flows at a rate of 250 g/sec through a 5.1-cm-ID pipe that is enclosed by a jacket containing condensing steam at 150?C. If the pipe is 9 m long, determine the outlet temperature of the oil.GIVENUnused engine oil flows through a pipe enclosed by a jacket containing condensing steam.Oil flow rate, m = 250 g/s = 0.25 kg/s.Oil inlet temperature, Tb,in = 100?C.Inner or inside diameter of pipe in which oil flows, D = 5.1 cm = 0.051 m.Length of heated pipe (heated by condensing steam) in which oil flows, L = 9m.Temperature of condensing steam, Ts = 150?C.ASSUMPTIONSSteady-state flow of oil and its heating by the condensing steam in the outer jacket.The temperature of condensing steam is constant and uniform across the length of pipe.The thermal resistance of the pipe is negligible, and hence the inside surface temperature of the pipe is Tw = Ts, this represents a uniform pipe surface temperaturecondition.

Transcribed Image Text:

Steam @ T,= 150°C- OI: TAn - 100°c- m-0.25 g/s Plpe ID=0.051 m -L-9m