Lecture 14 Nozzles, Diffusers, Turbines

Lecture 14 Nozzles, Diffusers, Turbines - Thermal and...

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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski Lecture 14 – Nozzles, Diffusers, and Turbines Nozzles and Diffusers The first law for an open system is 22 cv i e cv cv i i i e e e dE QW m h g z mh g z dt ⎛⎞ =−+ + + − + + ⎜⎟ ⎝⎠ ∑∑ ± ± ±± VV We now apply the first law to a variety of engineering devices. First consider a nozzle. In a nozzle, fluid velocity increases over a short distance through a smoothly varying area. Assumptions for a nozzle include: - adiabatic - no work - steady operation - no change in potential energy The first law for a nozzle becomes 12 11 2 2 0 =+− + One stream enters and one stream leaves. From conservation of mass Lecture 14 Page 1
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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski 12 mm = ±± The first law specialized for a nozzle becomes 22 hh += + V A diffuser is the opposite of a nozzle. In a diffuser, velocity decreases over a short distance through a smoothly varying area.
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Lecture 14 Nozzles, Diffusers, Turbines - Thermal and...

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