A High-Speed Imaging and Modeling Study of Dendrite Fragmentation Caused by Ultrasonic Cavitation
A High-Speed Imaging and Modeling Study of Dendrite Fragmentation Caused by Ultrasonic Cavitation
复制标题
超声空化引起的枝晶破碎的高速成像和建模研究
DOI：
10.1007/s11661-012-1188-3
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发表时间：
2012-10-01
影响因子：
2.8
通讯作者：
Grant, Patrick S.
中科院分区：
文献类型：
--
作者：
Shu, Da;Sun, Baode;Grant, Patrick S.
超声诱导空化气泡的动态行为及其对固化丁二腈1重量%樟脑有机透明合金的枝晶晶粒的破碎的影响进行了实验研究，使用高速数字成像和声波传播，空化动力学，和速度场在附近的内爆空化气泡的补充数值分析。实时成像和分析显示，气泡的剧烈内爆会产生局部冲击波，可以在几十毫秒内将附近的枝晶粉碎成小碎片。这些灾难性的事件是有效的，在打破生长的树枝状晶粒，并创建丰富的碎片晶体，可能会作为胚胎晶粒，因此，这些事件中扮演着重要的角色，在冶金合金的晶粒细化。
The dynamic behavior of ultrasound-induced cavitation bubbles and their effect on the fragmentation of dendritic grains of a solidifying succinonitrile 1 wt pct camphor organic transparent alloy have been studied experimentally using high-speed digital imaging and complementary numerical analysis of sound wave propagation, cavitation dynamics, and the velocity field in the vicinity of an imploding cavitation bubble. Real-time imaging and analysis revealed that the violent implosion of bubbles created local shock waves that could shatter dendrites nearby into small pieces in a few tens of milliseconds. These catastrophic events were effective in breaking up growing dendritic grains and creating abundant fragmented crystals that may act as embryonic grains; therefore, these events play an important role in grain refinement of metallurgical alloys.