Ultrafast Multiphase Flow Imaging by Electron Beam X-ray Computed Tomography


Ultrafast Multiphase Flow Imaging by Electron Beam X-ray Computed Tomography

Bieberle, M.; Fischer, F.; Schleicher, E.; Franke, M.; Menz, H.-J.; Mayer, H.-G.; Laurien, E.; Hampel, U.

Ultrafast electron beam X-ray computed tomography (CT) is an imaging technique (Bieberle & Hampel., 2006), which is able to recover the cross-sectional density distribution of multiphase flows with a frame rate of up to 10,000 fps and a spatial resolution of about 1 mm. Originally, electron beam CT was developed for cardiac imaging by Boyd (1983) and modern medical systems reach frame rates of about 20 fps. During the last years, this measurement technique has been advanced and qualified for flow imaging by the Forschungszentrum Dresden-Rossendorf and the University of Stuttgart. Its applicability to different two-phase flows has been demonstrated in a number of experiments (Bieberle et al., 2007, Bieberle et al., 2009). Specifically adapted image reconstruction methods allow to extract the phase boundaries and thus to determine the phase fractions within the tomography plane. The latest developments in ultrafast electron beam X-ray CT include the extension towards two or more tomography planes which enable furthermore to measure phase velocities by using cross correlation techniques. This in turn is essential for determining bubble volumes and volumetric flow rates, which are important parameters for the validation of CFD codes.

Keywords: X-ray; computed tomography; ultrafast multiphase flow imaging

  • Contribution to proceedings
    7th International Conference on Multiphase Flow, 30.05.-04.06.2010, Tampa, FL, USA
    Proceeding of 7th International Conference on Multiphase Flow, 9.3.2
  • Lecture (Conference)
    7th International Conference on Multiphase Flow, 30.04.-04.06.2010, Tampa, FL, USA

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Publ.-Id: 13904