Two-Phase Flow Measurements by Nuclear Magnetic Resonance Imaging.

摘要

Nonuniform velocity and concentration profiles have been measured for suspensions of heavy particles flowing in horizontal tubes. All measurements were performed during steady flow conditions; mean particle concentrations were chosen between 1--10% and mean flow Reynolds numbers (based upon the fluid properties and the tube diameter) did not exceed 30. The time-averaged measurements were recorded noninvasively by using a flow-compensating, three-dimensional, pulse Fourier transform, nuclear magnetic resonance (NMR) technique. This method records both the fluid velocity and particle concentration information from a single experiment. Techniques have been implemented to resolve spatially the axial fluid velocity and particle concentration on a plane normal to the flow direction. This NMR scheme permits detailed analysis of the flow-induced structure of two-phase systems that will help to construct and verify the mathematical models used to predict multiphase flow behavior. 10 refs., 6 figs.