Solution Found!
Repeat Prob. 9-20 for helium gas.PROBLEM: Air expands
Chapter 2, Problem 63P(choose chapter or problem)
QUESTION:
Problem 63P
Repeat Prob. 9-20 for helium gas.
PROBLEM: Air expands isentropically from 1.5 MPa and 60°C to 0.4 MPa. Calculate the ratio of the initial to final speed of sound.
Questions & Answers
QUESTION:
Problem 63P
Repeat Prob. 9-20 for helium gas.
PROBLEM: Air expands isentropically from 1.5 MPa and 60°C to 0.4 MPa. Calculate the ratio of the initial to final speed of sound.
ANSWER:
Solution to 63P
Step 1
We need to find the ratio of initial speed to final speed of sound if helium expands from 1.5MPa at 600C to 0.4MPa isentropically.
To calculate we need to use the equation for isentropic flow applied to ideal gases.
P=pressure
V=volume
𝝲=specific heat of the gas
T =temperature