Advances in the Science and Engineering of Casting Solidification
Advances in the Science and Engineering of Casting Solidification
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铸件凝固科学与工程进展
DOI：
10.1007/978-3-319-48117-3_4
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Lebon G
中科院分区：
文献类型：
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作者：
Lebon G
本文从Keller-Miksis方程出发，建立了一个均相空化模型，并将其应用于熔体中气泡的生长、破裂和传播的两相问题。数值模拟的超声场从浸没的超声波发生器进行，并计算的声压施加到气泡输运方程的源项预测的产生，传播和崩溃的空化气泡在熔体中。使用挡板来修改流型和放大在流槽管道中的声波进行检查，以确定最佳的配置，最大限度地提高在高空化活性区域的液体的停留时间。模拟结果表明，匹配整数波长的尺寸，并因此与行波共振，是可取的，因为它们导致在液体中的成核气泡的浓度增加相比，其他尺寸。
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.