Research Article

Experiments in Fluids

, Volume 47, Issue 3, pp 369-378

Experimental two-phase flow measurement using ultra fast limited-angle-type electron beam X-ray computed tomography

  • M. BieberleAffiliated withInstitute of Safety Research, Forschungszentrum Dresden-Rossendorf e. V. Email author 
  • , F. FischerAffiliated withInstitute of Safety Research, Forschungszentrum Dresden-Rossendorf e. V.
  • , E. SchleicherAffiliated withInstitute of Safety Research, Forschungszentrum Dresden-Rossendorf e. V.
  • , D. KochAffiliated withInstitute of Nuclear Energy Technology and Energy Systems, Stuttgart University
  • , H.-J. MenzAffiliated withInstitute of Nuclear Energy Technology and Energy Systems, Stuttgart University
  • , H.-G. MayerAffiliated withInstitute of Nuclear Energy Technology and Energy Systems, Stuttgart University
  • , U. HampelAffiliated withInstitute of Safety Research, Forschungszentrum Dresden-Rossendorf e. V.

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Abstract

An experimental evaluation of a novel limited-angle-type ultra fast electron beam X-ray computed tomography approach for the visualization and measurement of a gas–liquid two-phase flow is reported here. With this method, a simple linear electron beam scan is used to produce instantaneous radiographic views of a two-phase flow in a pipe segment of a flow loop. Electron beam scanning can be performed very rapidly, thus a frame rate of 5 kHz is achieved. Radiographic projections are recorded by a very fast detector arc made of zink–cadmium–telluride elements. This detector records the X-ray radiation passing through the object with a sampling rate of 1 MHz. The reconstruction of slice images from the recorded detector data is a limited-angle problem since in our scanning geometry the object’s Radon space is only incompletely sampled. It was investigated here, whether this technology is able to produce accurate gas fraction data from bubbly two-phase flow. Experiments were performed both on a Perspex phantom with known geometry and an experimental flow loop operated under vacuum conditions in an electron beam processing box.