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311_guide14 - ME/NE 311 Introduction to Thermal and Fluid...

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ME 311 Reading Guide #14 1/2 ME/NE 311 Introduction to Thermal and Fluid Sciences Reading Guide #14 Chapter 6 Sections 6.2, 6.5 – 6.7 Section 6.2: Nozzles and Diffusers 1. What device is used to accelerate flow at subsonic conditions? __________________________________ 2. What device is used to decelerate flow at subsonic conditions? __________________________________ 3. What conservation equation is used to analyze nozzles and diffusers? __________________________ 4. Can changes in kinetic energy be neglected in nozzles and diffusers? Y or N 5. When simplified based on assumptions, the governing equation of a nozzle and that of a diffuser is identical. T or F Section 6.5: Throttling Valves 1. What is another name for a flow restriction device? __________________________ 2. What is the objective of a flow restriction device? _____________________________________ 3. Given the typical range of assumptions for a throttle, what is the relation between the inlet and exit enthalpies of a throttle? _______________________________ 4. Given that enthalpies are functions of temperature only for an ideal gas, is it safe to say that the flow through a throttle for an ideal gas is isothermal (given the typical range of assumptions)? Y or N
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