The use of critical flow venturi nozzles with saturated wet steam

Amini, A. and Owen, I. (1995) The use of critical flow venturi nozzles with saturated wet steam. Flow Measurement and Instrumentation, 6 (1). pp. 41-47. ISSN 0955-5986

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Item Type:Article
Item Status:Live Archive

Abstract

This paper describes the results of an investigation into the use of critical flow venturi nozzle flowmeters with wet saturated steam. The real-gas flow coefficient has been calculated using the equations of state for steam, which show the steam behaviour to be far from ideal along the saturation line. The nozzle was calibrated using superheated steam and the mass flow rate measured using a condensate weightank was seen to agree with the flow rate measured by the nozzle to within ±2, although up to half of this uncertainty may be due to the uncertainty in the calibration rig and in the measured parameters used in the nozzle equation. The nozzle was then calibrated in saturated steam with dryness fractions down to 84. The nozzle can still be used by including a wet steam correction factor in the flow rate calculation, or a more practical approach might be to precede the nozzle by an efficient steam/water separator, assume the steam then to be dry saturated and accept an uncertainty in the mass flow of 3. © 1995.

Keywords:Calculations, Calibration, Compressibility of gases, Equations of state of gases, Flow measurement, Flowmeters, Pressure, Specific heat, Steam, Temperature, Condensate weightank, Critical flow venturi nozzles, Discharge coefficient, Dryness fractions, Mass flow rate, Real gas flow coefficient, Saturated wet steam, Superheated steam, Nozzles, Flowmeters, Nozzles, Venturi Meters
Subjects:H Engineering > H141 Fluid Mechanics
Divisions:College of Science > School of Engineering
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ID Code:18280
Deposited On:08 Aug 2015 17:22

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