Contactless Ultrasound Generation in a Crucible
Contactless Ultrasound Generation in a Crucible
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DOI：
10.1007/s11661-015-2824-5
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发表时间：
2015-07-01
影响因子：
2.8
通讯作者：
Pericleous, Koulis A.
中科院分区：
文献类型：
--
作者：
Bojarevics, Valdis;Djambazov, Georgi S.;Pericleous, Koulis A.
超声波处理在轻合金凝固过程中用于细化微观结构、去除气体或分散浸入的颗粒。当探头尖端振动导致气穴时，浸入熔体中的机械超声焊极最有效。液体与探头的接触对于高温或反应性熔体可能是有问题的，从而导致污染。提出了一种利用电磁感应产生超声波的非接触式方法。作为奖励，EM力引起剧烈搅拌，分布效果以处理更大体积的材料。在一个典型的应用中，围绕坩埚的感应线圈-也用于熔化合金-可以通过适当的调谐用于此目的。或者，可以使用浸入熔体中的顶部线圈（但由于EM力排斥而仍然是非接触的）。声，流，和EM场的数值模拟表明，大的压力振幅，导致空化可以实现这种方法。
Ultrasound treatment is used in light alloys during solidification to refine microstructure, remove gas, or disperse immersed particles. A mechanical sonotrode immersed in the melt is most effective when probe tip vibrations lead to cavitation. Liquid contact with the probe can be problematic for high temperature or reactive melts leading to contamination. An alternative contactless method of generating ultrasonic waves is proposed, using electromagnetic (EM) induction. As a bonus, the EM force induces vigorous stirring distributing the effect to treat larger volumes of material. In a typical application, the induction coil surrounding the crucible-also used to melt the alloy-may be adopted for this purpose with suitable tuning. Alternatively, a top coil, immersed in the melt (but still contactless due to EM force repulsion) may be used. Numerical simulations of sound, flow, and EM fields suggest that large pressure amplitudes leading to cavitation may be achievable with this method.