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quiz4-key 2005

quiz4-key 2005 - CHE 4253 Quiz 4 Instructor Dimitrios V...

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CHE 4253 - Quiz 4 Instructor: Dimitrios V. Papavassiliou November 22, 2005. Name:………………………. OU ID or SSN:……………………… Answer all questions and show your calculations, if any are necessary. 1. (10 points) Indicate whether the following statements are True or False. (a) To avoid the formation of slugs in a two-phase flow pipe, we tilt the pipe upwards. TRUE FALSE We actually tilt downwards! (b) The flow regime called “stratified flow” cannot occur in vertical two phase flow (gas-liquid flow). TRUE FALSE Stratified flow happens in horizontal flow, because of density differences between the liquid and the gas. In vertical flow, there is no such difference to force the liquid on one side of the pipe (c) The lower the pinch point in a heat exchanger, the smaller the area of heat exchange. TRUE FALSE In fact, when the pinch point goes to zero, the area goes to infinity (d) The flow regime called “annular flow” cannot occur in vertical two phase flow (gas-liquid flow).

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quiz4-key 2005 - CHE 4253 Quiz 4 Instructor Dimitrios V...

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