A Nuclear Magnetic Resonance Method for the Investigation of Two-Phase Flow

A new NMR flow measurement method has been developed, which is applicable over a wide range of velocities and flow conditions (velocity range at present 0.3 to 100 m/s; applicable at laminar, turbulent, plug flow etc.). It is particularly well suited for highly turbulent flow. It uses the efflux of nuclear spins out of the NMR RF coil. The efflux curve, thus obtained is analysed in terms of a distribution of velocities, the respective amplitudes of which form the velocity probability distribution function. The mass flow of different phases in the flow pattern can be obtained, provided they possess different average velocities.