# Volume Flow Measurements Obstruction Meters Orifice Meters Venturi Meters Flow N

## Volume Flow Measurements Obstruction Meters Orifice Meters Venturi Meters Flow N

Fong, Richard, Features Editor has reference to this Academic Journal, PHwiki organized this Journal Volume Flow Measurements Obstruction Meters Orifice Meters Venturi Meters Flow Nozzles Flow through a Nozzle Basic Equations: a.) Continuity: mass in = mass out b.) Bernoullis Eqn. Total pressure is constant throughout

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Flow through a Nozzle Flow through a Nozzle Flow through a Nozzle DP

Flow through a Nozzle Y = Compressibility Factor =1 as long as incompressible flow or when DP Pabs C= Discharge Coefficient =f(Re) in addition to nature of specific flow meter DP P Flow through a Venturi Meter In a venturi, 0.95 < C < 0.98 Advantage: Pressure recovery Uses little power Flow through a Venturi Meter C Re 2 x 105 0.98 Based upon the conditions in the pipe approaching the meter Back to the Nozzle P1 P2 P P1 P2 The Nozzle Flowmeter Shorter in addition to cheaper than venturi But larger pressure drop. Thus, more power lost in operating. C 0.86 0.98 103 105 Re Flow Through an Orifice Meter Flow Through an Orifice Meter P1 P2 P P1 d D Flow Through an Orifice Meter Cheapest in addition to Simplest But biggest pressure drop in addition to power lost (C~0.6 - 0.7) Side Note: Pressure drop caused by friction in addition to turbulence of shear layer downstream of vena contracta 0.6 0.85 b=d/D 0.1 0.8 Re 100k 5000 10k Elbow Flowmeter Laminar Flowmeter Pitot-Static Tubes Rotameter, variable-area-flowmeter Force balance Drag Force Gravity Buoyancy (usually negligible) Derived on next slide For a fixed x-position, A is fixed. Then Rotameter Equations Turbine Flow Meters Vortex meters operate on the principle that when a non-streamlined object is placed in the middle of a flow stream, vortices are shed alternately downstream of the object. The frequency of the vortex shedding is directly proportional to the velocity of the liquid flowing in the pipeline. Magnetic flowmeter Magnetic flowmeter Based upon Faradays Law The fluid is the conductor, must be electrically conductive. E=BDVx10-8 E=voltage, volts B=magnetic flux density, gauss D= length of the conductor, cm V=velocity of the conductor, cm/sec Magnetic Flow Meter

Coriolis Mass Flow Meter Coriolis Mass Flow Meter Vibrating Flow Tube Fluid Force is Reacting to Vibration of Flow Tube End View of Flow Tube Showing Twist Twist Angle Twist Angle Flow Force Flow Force Flow Flow Coriolis Mass Flow Meter

Positive Displacement Meters

## Fong, Richard Features Editor

Fong, Richard is from United States and they belong to Dsport and they are from  Huntington Beach, United States got related to this Particular Journal. and Fong, Richard deal with the subjects like Aftermarket Industry; Automotive Industry

## Journal Ratings by Wentworth Institute of Technology

This Particular Journal got reviewed and rated by Wentworth Institute of Technology and short form of this particular Institution is MA and gave this Journal an Excellent Rating.