Flow measurement analysis

Instrumentation Flow
1

Flow measurement play an important role from calculating mass flow to volumetric flow which are critical and important parameter to know about actual total flow generated.flow can be measured for liquid or gas. both can be measured in mass or volumetric flow. in both case material related bases on flowing fluid’s density. however, in case of liquid it is totally independent of density and in case of gas density mostly depends upon temperature and pressure.

let distinguish between mass flow and volumetric flow by definition,

Mass Flow - Mass flow rate is a mass of fluid which passes per unit of time. mass flow measured in kg/s or kg/h represented by symbol m.

Volumetric Flow - volumetric flow is a volume of fluid which passes per unit of time. volumetric flow measured in m3/s or m3/hr denoted by Q.

effect on measurement due to different measuring condition,

Gas - gase are compressible and change its volume due to different pressure and temperature. so volume at one temperature and pressure can never be same at different temperature. in case of actual flow rate measured through meter and standard flow rate can be measured through meter using unit like actual cubic meter per hour or standard cubic meter per hour. mass of gas can directly measured measure independent of temperature and pressure using different flow measuring technique.

Liquid - liquid has no effect of any condition whatsoever which can be measured in variety unit out them most commonly used unit is gallon per min.

Types of Flow Measurement Method

there are various method to measure flow based on condition we can use appropriate method which can give best result. method are,

1) Mechanical Flow Meter

  1. Turbine Flow Meter

  2. oval gear meter

  3. paddle wheel meter

  4. current meter

2) Obstruction Based Meter

  1. Orifice plate

  2. venturi tube

  3. wedge type

  4. annubar

  5. pitot tube

  6. Flow nozzle

3) Variable Area Flow Meter

  1. Rotameter

  1. Thermal Mass Meter

  2. Ultrasonic Flow Meter

  3. Electromagnetic Flow Meter

  4. Vortex Flow Meter

  5. Coriolis Mass Flow Meter

  6. Laser Doppler Flow Meter

  7. Sonar Flow Meter

  8. Open Channel Flow Meter

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