Engine oil flows through a 25-mm-diameter tube at arate of

Chapter 8, Problem 8.26

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Engine oil flows through a 25-mm-diameter tube at arate of 0.5 kg/s. The oil enters the tube at a temperatureof 25C, while the tube surface temperature is main-tained at 100C.(a) Determine the oil outlet temperature for a 5-m andfor a 100-m long tube. For each case, compare thelog mean temperature difference to the arithmeticmean temperature difference.(b) For 5?L?100 m, compute and plot the averageNusselt number and the oil outlet temperatureas a function of L

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