The experiment METERO is designed by the French Atomic Energy commission to provide data necessary for the validation of two-phase-CFD simulations in adiabatic conditions. The horizontal test section, equipped with several measurement techniques, allows the exploration of different water/air flow regimes (including bubbly, stratified and transition from bubbly to stratified flow). Measurements of the axial and radial components of the water instantaneous velocity have been carried out using hot film anemometry to characterise the water single-phase flow development. The mean velocity, the fluctuation r.m.s and the turbulent kinetic energy have been inferred. The first results exhibit a good agreement with the literature on turbulent pipe flows. The second campaign is devoted to the study of the bubbly flow configuration for various air mass flowrates. Local void fraction, interfacial area concentration and interface velocity measurements are also performed, using home-made optical probes. After a definition of the needs for CFD validation, the experiments and the measurements techniques are presented and the first test results are shown. The uncertainty associated with the measurement techniques is also discussed. 1
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