This preview shows page 1. Sign up to view the full content.
Unformatted text preview: tem
isolated from its environment, the entropy of that system will tend not to decrease.
From 1st law, for a reversible process:
This is the wide used Gibbs equation. Consider of
, we can get:
For ideal gas,
for isentropic flow, is constant,
Solve for ⇒ Integrate: SHU Fall 2012 3 Thermodynamics (Review) LEC 2 Example 1:
Air flow through a long duct of constant area at 0.15
. A short section of the duct is
cooled by liquid nitrogen the surrounds the duct. The rate of heat loss in the section is
from the air. The absolute pressure, temperature, and velocity entering the
cooled section are 188 kPa, 440 , and 210
, respectively. At the outlet, the absolute
pressure and temperature are 213
View Full Document
This note was uploaded on 09/03/2013 for the course AE 339 taught by Professor Wei during the Fall '12 term at NMSU.
- Fall '12