Magnetohydrodynamic Experiments in NaK Karlsruhe

The MEKKA-facility consists of a large Na22K78 (NaK) liquid metal loop and a magnet with a vertical magnetic field. The entire NaK loop with the test section can be moved on rails along the axis of the magnet. This allows a good access to the instrumented test section and variable positioning of the experiment within the magnets. Due to the model fluid NaK this facility is capable of attaining MHD parameters relevant for liquid-metal fusion blankets at room temperature (Interaction parameters in the range of N=102-105, Hartmann numbers up to Ha=104). Therewith, thermoelectric perturbations are minimized, which enables highly accurate results.


Magnet Dipol magnet            
Magnetic gap shape Cuboid, closed
Space of homogeneous field (mm) L=800, H=165, W=483
max. field strength /Tesla/ 2.1


Liquid metal loop  
NaK inventory 200 l
Electromagnetic pump
  • Used for high temperature applications
  • Suitable for moderate flow rates
Mechanical centrifugal pump
  • Maximum flow rate: 25 m3/h
  • Maximum pressure head: 9 bar
  • Operational T<150°C


Sketch of MEKKA Loops MEKKA-Labor

MEKKA loop