Study of gas-liquid two-phase flow in pipes with ultrafast electron beam X-ray CT


Study of gas-liquid two-phase flow in pipes with ultrafast electron beam X-ray CT

Fischer, F.; Hampel, U.

Electron beam X-ray CT is capable of fast measurement of multi-phase flows with frame rates of 1000 images per second and higher. The principle is based on the creation of a moving X-ray spot by electromagnetic deflection of a high-intensity electron beam across a circular target within an evacuated scanner enclosure. Together with a fixed fast X-ray detector this setup allows scanning of objects at frame rates well beyond that of classical CT machines. Our group has developed a scanner that is capable of scanning at up to 7 kHz frame rate and approximately 1 mm spatial resolution. The technique allows visualizing and measuring multiphase flows in vessels of moderate size. We have applied this fast electron X-ray tomography to the study of gas-liquid flow in a vertical pipe of 50 mm inner diameter. Different two-phase flow regimes from bubbly flow to churn-turbulent flow were produced and scanned. The data were processed using self-made image reconstruction software which implements the filtered backprojection technique and further post-processing algorithms for determination of gas-phase parameters, such as temporal and radial gas fraction profiles.

Keywords: Electron beam tomography; X-ray tomography; flow measurement; two-phase flow

  • Lecture (Conference)
    6th World Congress of Industrial Process Tomography, 06.-09.09.2010, Peking, China

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Publ.-Id: 14619