Advances in the Science and Engineering of Casting Solidification - An MPMD Symposium Honoring Doru Michael Stefanescu
Advances in the Science and Engineering of Casting Solidification - An MPMD Symposium Honoring Doru Michael Stefanescu
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铸造凝固科学与工程进展 - 纪念 Doru Michael Stefanescu 的 MPMD 研讨会
DOI：
10.1002/9781119093367.ch4
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Lebon G
中科院分区：
文献类型：
--
作者：
Lebon G
从Keller-Miksis方程出发，建立了一个均匀空化模型，并将其应用于气泡在熔体中的生长、破裂和传播的两相问题。数值模拟了浸没声棒的超声场，并将计算的声压应用于气泡输运方程的源项，以预测空化气泡在熔体中的产生、传播和破裂。研究了在洗衣管道中使用挡板来改变流型和放大声波，以确定在高空化活动区最大化液体停留时间的最佳构型。模拟结果表明，与其他维度相比，与整数波长匹配的维度与行波共振是可取的，因为它们导致了液体中成核气泡浓度的增加。
A homogeneous cavitation model, derived from the Keller–Miksis equation, is developed and applied to the two-phase problem of bubble growth, break-up and propagation in the melt. Numerical simulations of the ultrasonic field emanating from an immersed sonotrode are performed, and the calculated acoustic pressure is applied to the source term of the bubble transport equation to predict the generation, propagation and collapse of cavitation bubbles in the melt. The use of baffles to modify the flow pattern and amplify sound waves in a launder conduit is examined to determine the optimum configuration that maximizes the residence time of the liquid in high cavitation activity regions. The simulation results demonstrate that dimensions that match integer wavelengths, and are therefore in resonance with the travelling waves, are desirable since they lead to an increase in the concentration of nucleating bubbles in the liquid compared with other dimensions.