lecture 14 - Thermal and Fluids Engineering I Lecture 14...

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Thermal and Fluids Engineering I Lecture 14 Page 1 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 Q W m h gz m h gz 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 mh =+ + One stream enters and one stream leaves. From conservation of mass
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Thermal and Fluids Engineering I Lecture 14 Page 2 12 mm = && The first law specialized for a nozzle becomes 22 hh += + VV 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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This note was uploaded on 04/08/2008 for the course ENGR 2250 taught by Professor Borca-tasciuc during the Spring '08 term at Rensselaer Polytechnic Institute.

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lecture 14 - Thermal and Fluids Engineering I Lecture 14...

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