Experimental and numerical investigation of acoustic pressures in different liquids
Experimental and numerical investigation of acoustic pressures in different liquids
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DOI：
10.1016/j.ultsonch.2017.12.002
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发表时间：
2018-04-01
影响因子：
8.4
通讯作者：
Eskin, Dmitry
中科院分区：
文献类型：
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作者：
Lebon, G. S. Bruno;Tzanakis, Iakovos;Eskin, Dmitry
在试图量化的瞬时压力场在空化液体在大的强制信号，压力进行了测量，在四个不同的液体包含在容器中的频率模式与强制信号的共振。首次对液态金属中的压力场进行了量化，在液态铝中测得的最大压力为10-15 MPa。这些高压被认为是负责解聚和树枝状金属间化合物和其他夹杂物的碎片。数值模拟表明，声屏蔽衰减压力远离超声波发生器，它是突出的透明液体研究，但在铝，这表明铝的行为是不同的。由于声屏蔽的存在，所提出的数值模型不能充分地捕捉远离强空化区的压力场，但能很好地定性描述空化活动。所获得的结果有助于理解金属合金的超声熔体处理（UST）的过程，同时进一步促进在工业水平上控制UST的指导方针的制定和可重复的协议。
In an attempt to quantify the instantaneous pressure field in cavitating liquids at large forcing signals, pressures were measured in four different liquids contained in vessels with a frequency mode in resonance with the forcing signal. The pressure field in liquid metal was quantified for the first time, with maximum pressures of the order of 10-15 MPa measured in liquid aluminium. These high pressures are presumed to be responsible for deagglomeration and fragmentation of dendritic intermetallics and other inclusions. Numerical modelling showed that acoustic shielding attenuates pressure far from the sonotrode and it is prominent in the transparent liquids studied but less so in aluminium, suggesting that aluminium behaviour is different. Due to acoustic shielding, the numerical model presented cannot adequately capture the pressure field away from the intense cavitation zone, but gives a good qualitative description of the cavitation activity. The results obtained contribute to understanding the process of ultrasonic melt treatment (UST) of metal alloys, while facilitating further the guidelines formulation and reproducible protocols for controlling UST at industrial levels.