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Flow Measurement

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Published in: Physics
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Orifice Meter and Venturi Meter

Gaurav / Kota

2 years of teaching experience

Qualification: B.Tech.

Teaches: Mathematics, Physics

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  1. Flow Measurement (Orifice meter)
  2. Venturi Service: Clean Liquids, Gases Steam Slurries and Dirty Fluids Scale: Square Root Accuracy: 1% Full Scale Rangability: 3:1 Permanent Pressure Loss: Low Cost: High
  3. Venturi Effect The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section of pipe. The Venturi effect is a jet effect; as with an (air) funnel, or a thumb on a garden hose, the velocity of the fluid increases as the cross sectional area decreases, with the static pressure correspondingly decreasing. 5/6/2015
  4. Venturi Meter From Bernoulli Equation: 2 —2 2g PA PB=h in theoretical velocity: = CVVB t B,act Upstream pressure tap pa Flow direction Downstream pressure tap Flow dire on C takes into account reduction Flow mass is given by: lh=Cv AB VB t Substituting with know values we have: = 0.962 cvhl/2 Density P Venturi tube
  5. Flow Nozzle Service: Liquids, Gases, Steam, High Velocity FIOWS Scale: Square Root Accuracy: 1% Full Scale Rangability: 3:1 Permanent Pressure Loss: High Cost: High
  6. Venturi & Flow Nozzle High Pressure Tap ÅJ Short-Form Venturi Tube B) Universal Venturi C) Flow Nozzle
  7. Orifice meter ' It may be installed in pipeline with a minimum of trouble and expense
  8. Orifice Service: Clean Liquids, Gases Steam,(no slurries or corrosive) Scale: Square Root Accuracy: 1% Full Scale Permanent Pressure Loss: High Cost: Low
  9. Orifice meter Flow Orifice plate to manometer (b) Sketch of orifice installation pipe diarneter
  10. Orifice From Bernoulli Equation: 2 —2 2g in theoretical velocity: = C v VFt F,act Flow mass is given by: m = CC A Cc takes into account the area contraction: cc CD takes into account reduction CD = CCCV Substituting with know values we have: m = 1.398 CDhl/2 Meter O' f ferenttai pressure Pressure DO tum Courtesy of Superior Products, Inc. www.orificeplates.com Differential pressure 10
  11. Variation of K with Re ' At high Reynolds number K is essentially constant, but as Reynolds number is lowered, K is also increased ' ICmaxm at 200-600
  12. Variation of K with Re 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 102 2 5 103 0.50 0.30 5 107 2 Reynolds number of approach,
  13. Variation of K with Re (cont) The lowering of Reynolds number increases viscous action which causes a decrease in cv and an increase in C 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
  14. Orifice meter ' Disadvantage Its practical disadvantage is that- it offers greater frictional resistances as compared to

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