# Temperature and pressure change in a diffuser

1. Dec 6, 2013

### LauraMorrison

I am totally stuck on this question. It is about a diffuser and it does not tell you what fluid is running through the system.

"A diffuser has the following inlet conditions:

p1=100kPa
T1=300K
Velocity=200m/s
Area=100m2
Specific Volume=1.6445m3/kg

The exit velocity is 20m/s

Calculate the exit pressure, temperature and the mass flow rate. (Assume adiabatic operation)."

Would it be correct to use the Bernoulli equation, taking into account enthalpy and kinetic energy changes, to calculate the exit pressure? This is assuming density is constant.

I am not aware of any equation which will allow me to work out the exit temperature without knowing what substance is actually contained in the system.

Any help with this would be very much appreciated,
Thanks

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