ME 311 Reading Guide #4
1/2
ME/NE 311
Introduction to Thermal and Fluid Sciences
Reading Guide #4
Chapter 2
Sections 12 through 14
Section 2.12: Polytropic Processes for an Ideal Gas
1.
A polytropic process is one in which the pressure varies inversely with the volume (or
specific volume) raised to the ‘n’ power. T or F
2.
Write the equation for work between state 1 and state 2 if a system undergoes a polytropic
process with a value of ‘n’ equal to one.
_______________________________________________________________________
3.
Is the process presented in #2 above restricted to ideal gases? Y or N
4.
Write the equation for work between state 1 and state 2 if a system undergoes a polytropic
process with a value of ‘n’ NOT equal to one.
_______________________________________________________________________
5.
Explain why ‘an isothermal process of an ideal gas is polytropic with n=1.’ _________________
______________________________________________________________________________________________________
6.
Under what conditions (restrictions or assumptions) will ‘n’ be equal to ‘k’, the latter of which
is known as the ratio of specific heats? ____________________, _________________________,
________________________________, ___________________________________
7.
(Ask this question in class). How much variation in specific heat between the value at the
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 Spring '11
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