Light Metals 2019
Light Metals 2019
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2019年轻金属
DOI：
10.1007/978-3-030-05864-7_196
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Tonry C
中科院分区：
文献类型：
--
作者：
Tonry C
非接触式超声波使用来自次级线圈的洛伦兹力来诱导合金熔体中的超声波振动。为了达到足够高的空化压力，需要共振。然而，由于声音在坩埚壁内的传输和反射，坩埚内熔体共振模式的预测是复杂的。比较了两种声学模型，一种在时域求解简化动量方程，另一种在频域求解亥姆霍兹方程。频域模型允许快速扫描频率进行共振调谐，瞬态模型可以进行更详细的分析。验证是根据特定于液态金属介质的边界条件导出的分析测试案例和在铝熔化坩埚中获得的实验数据进行的。结果证实，声音在坩埚壁上的传播对共振频率有显著影响，需要考虑。
Contactless ultrasound uses Lorentz forces from a secondary coil to induce ultrasonic vibrations in alloy melts . To achieve pressures high enough for cavitation , resonance is required. However, the prediction of the resonant modes for a melt in a crucible is complex, due to the transmission and reflection of sound within the crucible walls. Two acoustic models, one solving a simplified momentum equation in the time domain, the other solving the Helmholtz equation in the frequency domain are compared. The frequency domain model allows a fast sweep of frequencies for resonance tuning, and the transient model enables a more detailed analysis. Validation is against analytic test cases derived with boundary conditions specific for the liquid metal medium and against experimental data obtained in an aluminum melting crucible. Results confirm that sound transmission into the crucible walls has a significant effect on resonant frequencies and needs to be accounted for.