Lecture 17 PES Su 2011 annotated

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

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Unformatted text preview: ME 200: Thermodynamics I Lecture 17: Open system 1 st Law analyses Prof. Sojka Summer 2011 5 July 2011M E 2002 In this Lecture … • We will: – Begin to practice using the 1 st Law to analyze open systems ME 2003 Common Steady-flow Devices Nozzles/ Diffusers Turbines/ Compressors/ Pumps Heat Exchangers and Mixers Throttles 3 ME 200 5 July 2011 ME 2004 Nozzles 4 ME 200 5 July 2011 ME 2005 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 ME 200 5 July ME 2006 Nozzles and Diffusers • Given in problem statement. • Any rotating shafts, electricity, or moving boundaries? No, so it’s 0! • No appreciable elevation change, so ∆ pe ≈ 0. • Their purpose is to transform ke to flow work, and vice versa, so ∆ ke ≠ 0....
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Lecture 17 PES Su 2011 annotated - ME 200 Thermodynamics I...

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