Preliminary Vorticity Measurements by a Method Based on a MHD Principle
The idea of the method comes from MHD and is based on the equation div j = 0 and the Ohm’s law j = σ(∇⌽) + v × B), where j — is the electric current, — the potential of the electrical field, v — velocity, B — magnetic field intensity. The consequence is ∇2⌽ = Brotv (the term vrotB is several orders smaller). This enables one to measure the component of the vorticity ωB parallel to the magnetic field, by measuring the ∇2⌽ which in turn could be measured using a 7 electrodes probe realizing a central difference approximation of the Laplacian. Thus, the method is an absolute one and for this reason no calibration procedure is necessary.
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