©1997 by M. Kostic Ch.9: Pressure & Velocity Measurements Pressure Concept:Pressure Concept: …it is an inward-normal force per unit (contact) area [N/m.

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Presentation transcript:

©1997 by M. Kostic Ch.9: Pressure & Velocity Measurements Pressure Concept:Pressure Concept: …it is an inward-normal force per unit (contact) area [N/m 2, psi, atm, inHg, …] …it is net-effect of change of momentum of a fluid’s molecules collision with real (or imaginary) surface …absolute lack of molecular activity is the zero absolute pressure …it is a material property…it is a material property

©1997 by M. Kostic Pressure Scales Vacuum pressure Gauge pressure Absolute pressure Standard atm. pressure kPa(abs) psi(a) 760 mmHg(a) inHg(a) Local atm. pressure Local atm. pressure

©1997 by M. Kostic Reference pressure instruments

©1997 by M. Kostic U-tube Manometer PAPA PBPB

©1997 by M. Kostic Inclined tube manometer

©1997 by M. Kostic Elastic-element pressure sensors

©1997 by M. Kostic Bourdon tube pressure gauge

©1997 by M. Kostic Diaphragm pressure transducer

©1997 by M. Kostic Piezoelectric pressure transducer

©1997 by M. Kostic Design and errors of Pitot/Prandtl probe

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