X-ray and micro-focus X-ray computed tomography

X-ray tomography enables a non-invasive superposition-free visualisation of the density distribution in an object. Beside the slice-wise two-dimensional reconstruction with a conventional 2D CT setup it is today possible to employ cone-beam tomography by using a two-dimensional X-ray detector and applying cone-beam reconstruction algorithms. This enables reconstruction of the 3D structure of an object from a single tomographic measurement cycle. In the frame of research in thermal fluid dynamics we use X-ray radiography and tomography techniques for the measurement of gas and liquid hold-up in chemical vessels and experimental flow loops.

The Institute of Fluid Dynamics utilizes different X-ray devices for various application areas. These comprise a conventional X-ray system, a micro-focus X-ray assembly and some ultrafast X-ray CT setups. These systems are being used for radiography, radioscopy and cone-beam tomography and of small and medium sized vessels thereby achieving spatial resolutions from 0.5 mm down to 5 µm. Conventional X-ray system with two X-ray radiators, 2D detector and object manipulation stage

Gas hold-up distribution in a stirred reactor with gas inducing turbine (measured with conventional cone-beam CT, spatial resolution approx. 0.5 mm)

Highest spatial resolutions are achievable by employing a micro-focus X-ray system. Such a system is used for measurements on small objects and in micro-fluidic applications (crystallisation processes, capillary flows, micro structure tomography). Micro focus X-ray system Macropores in a nascent polyolefin particle (microfocus CT, spatial resolution approx. 3 µm)

Liquid phase in the capillaries of a monolith catalyst (microfocus CT, spatial resolution approx. 3 µm)

Publications

Per-reviewed journal articles:

• M. Schubert, A. Bieberle, F. Barthel, S. Boden, U. Hampel
  Advanced Tomographic Techniques for Flow Imaging in Columns with Flow Distribution Packings⁽¹⁾
  Chemie Ingenieur Technik 83(2011), 979-991.

• U. Hampel, J. Otahal, S. Boden, M. Beyer, E. Schleicher, W. Zimmermann, M. Jicha
  Miniature conductivity wire-mesh sensor for gas-liquid two-phase flow measurement⁽²⁾
  Flow Measurement and Instrumentation 20(2009), 15-21.

• S. Boden, M. Bieberle, G. Weickert, U. Hampel
  Three-dimensional analysis of macroporosity distributions in polyolefin particles using X-ray microtomography⁽³⁾
  Powder Technology 188(2008), 81-88.

• S. Boden, M. Bieberle, U. Hampel
  Quantitative measurement of gas hold-up distribution in a stirred chemical reactor using X-ray cone-beam computed tomography⁽⁴⁾
  Chemical Engineering Journal 139(2008), 351-362.

• H. V. Hristov, S. Boden, U. Hampel, H. Kryk, G. Hessel, W. Schmitt
  A study on the two-phase flow in a stirred tank reactor agitated by a gas-inducing turbine⁽⁵⁾
  Chemical Engineering Research and Design 86(2008), 75-81.

Conference contributions:

• H. V. Hristov, S. Boden, U. Hampel, H. Kryk, W. Schmitt, G. Hessel
  Experimental and numerical assessment of the phase distribution in a stirred tank reactor agitated by a gas-inducing turbine⁽⁶⁾
  DECHEMA 2006 - GVC/DECHEMA-Jahrestagungen 2006, Rhein-Main-Hallen, Wiesbaden, 26.-28.09.2006, Wiesbaden, Germany
  Chemie Ingenieur Technik 78(2006), 1274.

• S. Boden, M. Bieberle, U. Hampel
  Measurement of porosity in polyolefin particles using X-ray microtomography⁽⁷⁾
  Proceedings 4th International Symposium on Process Tomography, Warzaw, Sept. 2006.

• H. V. Hristov, S. Boden, U. Hampel, H. Kryk, W. Schmitt, G. Hessel
  Experimental and CFD analysis of a stirred tank reaction mechanically agitated by gas-inducing turbine⁽⁸⁾
  Proceedings 17th International Congress of Chemical and Process Engineering, CHISA, 27.-31.08.2006, Praha, Czech Republic.

• H.V. Hristov, S. Boden, U. Hampel, H. Kryk, W. Schmitt, G. Hessel
  CFD simulations and X-ray measurements of the local gas hold-up in a stirred tank reactor agitated by a gas-inducing turbine⁽⁹⁾
  ANSYS-FZD Multiphase Flow: Simulation, Experiment and Application, 26.-29.06.2006, Dresden, Germany.

• M. Schubert, S. Boden, U. Hampel, R. Lange
  Untersuchung der Mehrphasenströmung in Trickle-Bed Reaktoren mittels Röntgenradiographie und –tomographie⁽¹⁰⁾
  Chemie Ingenieur Technik, 77(2005), 1215.

• S. Boden, U. Hampel, M. Speck
  Quantitative Measurement of Gas Distributions in a Stirred Chemical Reactor with Cone-Beam X-ray Computed Tomography⁽¹¹⁾
  Proceedings of the 4th World Congress on Industrial Process Tomography, Aizu, Japan, Sept. 2005, 813-818.

Miscellaneous publications:

• S. Boden, U. Hampel, M. Speck
  Cone-beam X-ray tomography of a batch reactor with gassing stirrer⁽¹²⁾
  Institute of Safety Research, Annual Report, FZR-420, 45-52, 2004.

• S. Boden
  Computertomographische Untersuchung von Phasenverteilungen in chemischen Rührkesselreaktoren⁽¹³⁾
  Diplomarbeit, Fakultät Elektrotechnik, TU Dresden, 2004.

Content from Sidebar

URL of this article
https://www.hzdr.de/db/Cms?pOid=25280

Links of the content