In the following, only a phenomenological analysis of the phenomenon has been performed with the aim of investing the applicability of the Venturi meter like an argon detector.
Figures 17-19 show the pressure profiles, at the centerline of the Venturi meter, with different value of the Ar volume fraction: it is possible to remark how the pressure drop in the convergent nozzle was approximatively the same for all cases, and the difference could be comparable with the uncertainty of the available (existing) meter.
(iv) A phenomenological investigation of the buoyancy contributions in the pressure drop across the Venturi meter will have to be carried out, in order to define the parameters (e.g., lead velocity, Reynolds number, and Venturi geometry) that most affect the considered phenomena.
Caption: FIGURE 8: Modifications of the Venturi meter geometry.
Figures 4 shows a 4-inch, 0.6 beta ratio Venturi meter under test at the CEESI wet natural gas flow facility.
Figure 8 shows wet gas flow and the corresponding diagnostic result when the wet gas flow induces a Venturi meter to over-read the gas flow rate.
Figure 12 shows a Solartron-manufactured 6-inch Venturi meter under standard calibration and simultaneously diagnostic calibration for Centrica at the GL Flow Center natural gas flow test facility in the UK.
Prognosis is now in use with Venturi meters. Petronas in Malaysia and Centrica in the UK have both independently added the diagnostic system to Venturi meters destined for offshore platforms.
Accuracy is derived from the flow of liquids through their special design, and can be as good as +/- 0.25 per cent of actual rate of flow for Venturi meters
that are independently lab calibrated, and +/-0.5 per cent of actual rate of flow in the case of the wedge-type products.
For gas flow measurement, installation requirements for orifice meters, coriolis meters, turbine meters, ultrasonic meters, and venturi meters
are provided in the guideline.