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This paper concerns the flow metering of wet gas by a Venturi meter. In many industrial applications dealing with the gas production, annular/dispersed two phase flows are mainly observed. A theoretical approach based on mass and momentum exchange permits prediction of the pressure, droplet velocity and film thickness distributions between the upstream and the downstream pressure taps. To improve these models, an experimental work dealing with the wall film thickness distribution in the convergent part of the Venturi meter is undertaken from flow visualizations and film thickness measurements. Averaged film thickness and wave characteristics in the convergent section are quantified and compared to theoretical results.