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PRESSURE MEASUREMENT Methods and Applications 1CE319F - Elementary Mechanics of Fluids - LaboratoryUT Austin

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Overview Pressure (P ) expresses the magnitude of normal force (F-N) per unit area (A-m 2 ) applied on a surface (Crowe et al. 2005) Units: Pa(= N/m 2), psi(=lbf/in 2 ), bar (=10 5 Pa=100 kPa), mbar (=100 Pa=1 hPa), atm (=101.3 kPa), mmHg (or Torr), inHg, etc. Note: For every Unit: hUnit=hectoUnit=100 Unit Where P abs : Absolute pressure P atm : Atmospheric pressure (standard is: kPa = psi=760 mmHg=29.92 inHg) P gage : Gage pressure 2CE319F - Elementary Mechanics of Fluids - LaboratoryUT Austin

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Pressure Measuring Devices Bourdon Gage: Applications: tire pressure, pressure at the top or along the walls of tanks or vessels Principles: change in curvature of the tube is proportional to difference of pressure inside from that outside the tube 3CE319F - Elementary Mechanics of Fluids - LaboratoryUT Austin

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Pressure Measuring Devices Strain Gage Applications: Sensors for internal combustion engines, automotive, research etc. Principles: ∆ P ∆ Resistance ∆ Voltage 4CE319F - Elementary Mechanics of Fluids - LaboratoryUT Austin

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Pressure Measuring Devices Quartz Gage Applications: measurements with high accuracy, good repeatability, high resolution. e g. Quartz Clock Principles: ∆ Pressure ∆ Charge ∆ Voltage Piezoelectric transducers 5CE319F - Elementary Mechanics of Fluids - LaboratoryUT Austin

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Pressure Measuring Devices Applications: Very accurate for small pressure differentials e.g. Difference between indoor and outdoor pressure Principles: ∆Pressure = ∆Charge = ∆Resistance = ∆Voltage Piezoresistive Gage Digital Manometer 6CE319F - Elementary Mechanics of Fluids - LaboratoryUT Austin

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Pressure Measuring Devices U-tube Manometer Principles: Hydrostatic Law ∆P=ρ g h 7CE319F - Elementary Mechanics of Fluids - LaboratoryUT Austin

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Pressure Measuring Devices U-tube Manometer Air Water Manometer Mercury Water Manometer Applications: air pressure, pipe pressure, etc. 8CE319F - Elementary Mechanics of Fluids - LaboratoryUT Austin

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UT Manometer Applet Click here Click here to connect to UT’s Interactive Fluids Applets website 9CE319F - Elementary Mechanics of Fluids - LaboratoryUT Austin

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