A Mathematical Model for the Dynamic Behavior of Melts Subjected to Electromagnetic Forces: Part II. Measurement of Surface Waves and Comparison with Predictions of the Mathematical Model

The waves on the surface of a cylindrical mercury pool subjected to a 3 kHz electromagnetic field have been observed. Oscillations were found to correspond to the known eigenfrequencies of a cylindrical liquid pool with a free surface. Which of the eigenfrequencies was dominant depended on the field strength and the relative position of the pool in the surrounding inductor. The amplitude of the oscillations was found to increase with increasing inductor current. The measurements showed fair to good agreement with the predictions of the mathematical model described in Part 1. A tentative mechanism for the excitation of the eigenfrequencies by the electromagnetic field is advanced and implications for electromagnetic casting are discussed.