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

ME 311 Reading Guide #14
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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