Magnetic field influence on the slip ratio in liquid metal bubbly flows
In order to describe the behaviour of a MHD two-phase flow a one-dimensional model for
the bubbly flow regime has been developed. The model provides basic information and
tendencies about the dependence of the slip ratio S on the applied magnetic field.
Two opposite tendencies can be observed in the case of a transverse magnetic field. On the
one hand the drag coefficient of a single bubble grows linearly with increasing field
strength. On the other hand hand the electromagnetic braking of the mean flow has to be
taken into account. Thus, at first the slip ratio decreases in the range of small field
values, reaches a minimum and increases again for a further growth of B.
The theoretical predictions were qualitatively confirmed by measurements in a sodium argon
flow at the sodium loop of the Forschungszentrum
Rossendorf.
Numerical and experimental results for the slip ratio S as a function of the field
strength B (Re = 18600)
Numerical and experimental results for the slip ratio S as a function of the field
strength B (Re = 46500)
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