quiz4-key - CHE 4253 - Quiz 4 Instructor: Dimitrios V....

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CHE 4253 - Quiz 4 Instructor: Dimitrios V. Papavassiliou November 21, 2006. Name:………………………. OU ID:……………………… Answer all questions and show your calculations, if any are necessary. 1. (10 points) Indicate whether the following statements are True or False. (a) The overall heat transfer coefficient for a heat exchanger changes if we pass a different fluid through its tube side at the same Reynolds number. TRUE FALSE Yes, because the heat transfer coefficient on the tube side depends on the Pr (b) The overall heat transfer coefficient through a pipe increases when fouling occurs. TRUE FALSE The coefficient goes down, and the resistance goes up. (c) The lower the pinch point in a heat exchanger, the smaller the area of heat exchange. TRUE FALSE (d) In a co-current flow heat exchanger, (i.e., single shell, single tube) the lines in the T-Q diagram cross. TRUE FALSE No, it would violate the 2 nd Thermo law. (e) If we want to decrease friction drag in a pipe we will operate in the turbulent flow regime (high
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quiz4-key - CHE 4253 - Quiz 4 Instructor: Dimitrios V....

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