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Study of Flow Behavior of Granular Material Inside Cylindrical Silo Using Ultrafast X-Ray Imaging Technique

Waktola S., Bieberle A., Barthel F., Bieberle M., Hampel U., Grudzień K., Babout L.

Image Processing & Communications

2017

Vol. 22, no. 2

49--56

This paper presents an application of an ultrafast electron beam X-ray CT scanner for investigating the gravitational flow behavior of granulates through cylindrical silo model. The CT scanner allows obtaining crosssectional images of the granular material distribution with a spatial resolution of approximately 1 mm and a time resolution of 2 kHz. In order to conduct a deep analysis of the granular flow concentration changes, two image processing algorithm steps were applied. The first step deals with preprocessing and re-centering stacks of raw images. The second step divides the preprocessed image into several concentric rings and calculates the mean value to study radial concentration changes. Independent analysis of granular concentration in each ring provides useful knowledge to study the silo discharging during mass flow and funnel flow.

Recent progress in ultra fast electron beam X-ray computed tomography

Hampel U., Fischer F., Bieberle M., Schleicher E.

Zeszyty Naukowe. Elektryka / Politechnika Łódzka

2009

z. 114

145-148

A new ultra fast electron beam X-ray CT scanner has been developed, implemented and tested in different applications. It consists, amongst other components, of an electron beam unit with 10 kHz scanning capability and 1 mm focal spot size and a 240 element circular CZT detector arc. The system is capable to produce slice images at up to 7 kHz frame rate of moderately absorbing objects with maximum 120 mm diameter. The paper introduces the scanner and first results for two-phase flow measurements in a bubble column and a fluidized bed.

Implementation of temperature control into a high resolution gamma ray detector for tomography applications

Bieberle M., Bärtling Y., Fleischer A., Sühnel T., Zimmermann W., Schleicher E., Hampel U.

Zeszyty Naukowe. Elektryka / Politechnika Łódzka

2009

z. 114

167-172

In this paper the development of a new thermal control design for a high resolution gamma ray computed tomography detector is presented. The new design has become necessary due to stringent requirements on count rate accuracy under varying thermal conditions at thermal hydraulic test loops. The components of the existing tomography detector have been analysed with respect to their thermal response and a new arrangement has been devised that is optimized with respect to efficient heat conduction from internal as well as external heat sources to a cooling circuit.