Physical Simulation of Mold Level Fluctuation Characteristics

Mold level fluctuations have an essential impact on slab quality control. In this study, the wave height and frequency of the fluctuations were analyzed using significant wave height and fast Fourier transform (FFT) in a water model of the mold. The mold flow field distribution was measured by particle image velocimetry (PIV), and the correlation effect between flow field, wave height, and frequency is discussed. The results show that the frequency change of the fluctuations is mainly influenced by the wavelength. The distance between the position of the vortex center and the narrow face of the mold (NF) increases, the travel of the surface liquid mass point increases, and the wavelength of the generated wave becomes longer, resulting in a decrease in frequency. Increasing the surface velocity will promote the overall fluctuations and have a greater impact on the liquid mass point in the fluctuation generating area, thus making the NF amplitude significantly higher. After entering the fluctuation decay area, the amplitude gradually decreases. Waves with frequencies below 0.1 Hz have the largest amplitude variation and are the most important frequency affecting the fluctuation variation. The maximum main frequency may be spontaneously generated.

Automated summary

In this study, the wave height and frequency of mold level fluctuations were analyzed, and the correlation between flow field, wave height, and frequency was discussed. The results show that the frequency of the fluctuations is mainly influenced by the wavelength, and increasing the surface velocity has a greater impact on the amplitude of the fluctuations. Waves with frequencies below 0.1 Hz have the largest amplitude variation and have the most significant effect on the fluctuations.