Development of non-contact electromagnetic sensor for the meniscus velocity measurement of molten metal flow

A velocimeter was proposed for the measurement of the surface velocity of molten metal flow. Cold model experiments were carried out to evaluate its accuracy. Wave motions were imposed on the molten Wood's metal surface by means of the Lorentz force. The propagation times of the waves in the upstream and downstream directions were detected with two level sensors. The surface velocity of molten Wood's metal flow was calculated from the propagation time difference and the distance between the two level sensors. The surface velocity could be accurately measured even if wave motions, i.e., meniscus level fluctuations caused by other external and internal oscillations existed on the molten metal surface. These disturbances can readily be removed using a narrow band pass filter because the frequency of the imposed wave motions is predetermined.