Flow Measurement (Orificemeter)teacher.buet.ac.bd/ashfaqansery/Fluid Me… · PPT file · Web...
Transcript of Flow Measurement (Orificemeter)teacher.buet.ac.bd/ashfaqansery/Fluid Me… · PPT file · Web...
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Flow MeasurementFlow Measurement(Orifice meter)(Orifice meter)
bybyAshfaq Md. AnseryAshfaq Md. Ansery
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Orifice meter It may be installed in pipeline with a minimum of trouble and expense
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Orifice meter
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Orifice meter
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Theory (Orifice meter)
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Variation of K with Re
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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
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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
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Placement of Pressure Tap
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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)
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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
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Orifice meter DisadvantageIts practical disadvantage is
that-it offers greater
frictional resistances as compared to venturimeter
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Reference
Chapter 12, Fluid MeasurementsFLUID MECHANICS with Engineering Applications
(SI Metric Addition)
Robert L. Daugherty Joseph B. Franzini
E. John Finnemore
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Reference (cont…)
Chapter 15, Flow Measurement, Page 440-447
Applied Fluid Mechanics (5th Edition)Robert L. Mott