Dr. André Bieberle
Phone: +49 351 260 2913

Prof. Dr.-Ing. Dr. h. c. Uwe Hampel

Experimental Thermal Fluid Dynamics
Phone: +49 351 260 2772

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Centrifugal pumps

Pumping liquids from a reservoir with a free surface, like basins or waterbodies, may lead to gas entrainment via hollow vortices, e.g. when the intake pipe socket is not sufficiently covered by liquid. Gas within the pump leads to a reduction of conveying capacity up to the point of collapse or damage of the pump. When the pump is part of a safety system, e.g. as an emergency cooling in a power plant, this must be avoided. Within the BMBF funded project SAVE the behaviour of an industrial pump operating in two-phase mode has been extensively analysed concerning different gas volume rates and gas patterns. Furthermore, arrangements have been analysed that can either avoid gas intake or convey the gas phase outside the pump. Gamma-ray CT was used to disclose the gas distribution in the impeller of the pump during rotation.

In another project together with TU Dresden also the interaction between gas phase and the impeller of a 200 mm axial pump was visualised using gamma-ray CT, which gave a fundamental insight into the collection of gas behind impeller blades for this type of pump.


  • T. Schaefer et al.
    Application of gamma-ray computed tomography for the analysis of gas holdup distributions in centrifugal pumps
    Flow Measurement and Instrumentation 46, pp. 262-267, 2015. [doi:10.1016/j.flowmeasinst.2015.06.001]
  • A. Bieberle et al.
    Validation of high-resolution gamma-ray computed tomography for quantitative gas holdup measurements in centrifugal pumps
    Measurement Science and Technology 26/9, pp.1-12, 2015, [doi:10.1088/0957-0233/26/9/095304]
  • M. Neumann et al.
    An experimental study on the gas entrainment in horizontally and vertically installed centrifugal pumps
    Journal of Fluids Engineering 138 (09130) pp. 1-9, 2016. [doi: 10.1115/1.4033029]
  • T. Schaefer et al
    Experimental investigations on a common centrifugal pump operating under gas entrainment conditions
    Nuclear Engineering and Design 316, pp.1–8, 2017. [doi: 10.1016/j.nucengdes.2017.02.035]
  • H.-M. Prasser et al.
    Time Resolving Gamma-Tomography for Periodically Changing Gas Fraction Fields
    Flow Measurement and Instrumentation 14, pp. 119-125, 2003. [doi:10.1016/S0955-5986(03)00010-4]