How to Calculate Velocity and Entropy Change in Throttled Airflow?

[deepthishan]

air flows at 2.3kg/s in 15cm diameter pipe. it has pressure= 7bar and temperature=368K before getting throttled by a valve to 3.5bar.
whats the velocity downstream and the change in entropy??

data: y=1.4, C_p=1005J/kgK, R=287
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i really am a little lost as to how to proceed

 

[tiny-tim]

Welcome to PF!

air flows at 2.3kg/s in 15cm diameter pipe. it has pressure= 7bar and temperature=368K before getting throttled by a valve to 3.5bar.
whats the velocity downstream and the change in entropy??

data: y=1.4, C_p=1005J/kgK, R=287

Hi deepthishan! Welcome to PF!

Use Bernoulli's equation … if you're still stuck, show us how far you've got, and then we'll know how to help.