On the use of nuclear magnetic resonance to characterize vertical two-phase bubbly flows

▶ We provide a complete theory of the PGSE measurement in single and two-phase flow. ▶ Friction velocity can be directly determinated from measured velocity distributions. ▶ Fast determination of moments shorten PGSE process with small loss of accuracy. ▶ Turbulent diffusion measurements agree well with known trends and existing models. ▶ We think NMR can be a tool to benchmark thermal anemometry in two-phase flow.