Question
Consider an isentropic flow of air (ratio of specific heats = 1.4) through a duct as shown in the figure.
The variations in the flow across the cross-section are negligible. The flow conditions at Location 1 are given as follows:
π1 = 100 kPa, π1 = 1.2 kg/m3 , π’1= 400 m/s
The duct cross-sectional area at Location 2 is given by A2 = 2A1, where A1 denotes the duct cross-sectional area at Location 1. Which one of the given statements about the velocity π’2 and pressure π2 at Location 2 is TRUE?
Options :
π’2 < π’1 , π2 < π1
π’2 < π’1 , π2 > π1
π’2 > π’1 , π2 < π1
π’2 > π’1 , π2 > P1
Answer :
π’2 > π’1 , π2 < π1
Solution :
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