Ch.9: Pressure

1
Ch.9 Pressure Velocity Measurements

• Pressure Conceptit is an inward-normal force
  per unit (contact) area N/m2, psi, atm, inHg,
• it is net-effect of change of momentum of a
  fluids molecules collision with real (or
  imaginary) surface
• absolute lack of molecular activity is the zero
  absolute pressure
• it is a material property

2
Pressure Scales
3
Reference pressure instruments
4
U-tubeManometer

5
Inclined tube manometer
6
Elastic-element pressure sensors
7
Bourdon tube pressure gauge
8
Diaphragm pressure transducer
9
Piezoelectric pressure transducer
10
Design and errors of Pitot/Prandtl probe