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Lecture 17 PES Su 2011 annotated

Lecture 17 PES Su 2011 annotated - ME 200 Thermodynamics I...

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ME 200: Thermodynamics I Lecture 17: Open system 1 st Law analyses Prof. Sojka Summer 2011
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5 July 2011 ME 200 2 In this Lecture … We will: Begin to practice using the 1 st Law to analyze open systems
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ME 200 3 Common Steady-flow Devices Nozzles/ Diffusers Turbines/ Compressors/ Pumps Heat Exchangers and Mixers Throttles 5 July 2011
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ME 200 4 Nozzles 5 July 2011
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ME 200 5 Nozzles and Diffusers A nozzle is used to increase fluid velocity . The velocity increase ( Δ ke>0) comes at the expense of a pressure decrease (flow work). A diffuser is used to increase the fluid pressure . The pressure increase (flow work) comes at the expense of a velocity decrease ( Δ ke<0 ). 5 July
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ME 200 6 Nozzles and Diffusers Given in problem statement. Any rotating shafts, electricity, or moving boundaries? No, so it’s 0! No appreciable elevation change, so Δ pe 0. Their purpose is to transform ke to flow work, and vice versa, so Δ ke 0.
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