Mathematical model of electromagnetic elimination in tubule with high frequency magnetic field
(1.辽宁省大连市大连理工大学国家重点实验室激光材料改性，离子和电子束材料科学与工程学院2.辽宁省大连市大连理工大学铸造工程研究中心3.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院4.广东省广州市科学院广州能源研究所)
Abstract: In order to find the ways to improve the elimination efficiency with high frequency magnetic field, a mathematical model of electromagnetic elimination (EME) in the tubule with high frequency magnetic field was set up. The calculated results show that by ignoring the flow of molten metal, when the surface magnetic induction intensity of the metal (B0) is 0.03 T and the diameter of the tubule is 8 mm, the non-metallic inclusions with 30 μm diameter can be wiped off in 7 s from the center of the molten aluminum, whereas the elimination time of the 5 μm non-metallic inclusions is more than 240 s. When B0 is 0.03 T, the diameter of the tubule is 8 mm and elimination time is more than 30 s, the elimination efficiency of 5μm, 10 μm and 30 μm non-metallic inclusions is about 60%, 90% and 100%, respectively, the elimination efficiency increases with the decreasing diameter of the tubule. It can be concluded that increasing the magnetic induction intensity or decreasing the diameter of the tubule can decrease the elimination time and improve the elimination efficiency in EME with high frequency magnetic field.
Key words: electromagnetic elimination, non-metallic inclusions, elimination time, elimination efficiency