Flow Measurement (Orifice meter)

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Presentation transcript:

Flow Measurement (Orifice meter) by Ashfaq Md. Ansery

Orifice meter It may be installed in pipeline with a minimum of trouble and expense

Orifice meter

Orifice meter

Theory (Orifice meter)

Variation of K with Re

Variation of K with Re (cont) At high Reynolds number K is essentially constant, but as Reynolds number is lowered, K is also increased K~maxm at Re= 200-600

Variation of K with Re (cont) The lowering of Reynolds number increases viscous action which causes a decrease in Cv and an increase in Cc The latter apparently predominates over the former until Cc reaches its maximum value (about to 1) With further decrease in Re, ‘K’ then becomes smaller because Cv continues to decrease

Placement of Pressure Tap

Difference between an Orifice meter and Venturimeter For venturi tube, there is no contraction- Area of the jet is always equal to the area of the throat and is fixed While for the orifice the area of the jet is a variable (less than Ao, the area of the orifice)

Difference between an Orifice meter and Venturimeter For venturitube Cd = Cv (Cc=1.0) While for the orifice, it is much more affected by variations in Cc than it is by variations in Cv

Orifice meter Disadvantage Its practical disadvantage is that- it offers greater frictional resistances as compared to venturimeter

Reference Robert L. Daugherty Chapter 12, Fluid Measurements FLUID MECHANICS with Engineering Applications (SI Metric Addition) Robert L. Daugherty Joseph B. Franzini E. John Finnemore

Chapter 15, Flow Measurement, Page 440-447 Reference (cont…) Chapter 15, Flow Measurement, Page 440-447 Applied Fluid Mechanics (5th Edition) Robert L. Mott