Scale up design study on process vessel dimensions for ultrasonic processing of water and liquid aluminium.
Scale up design study on process vessel dimensions for ultrasonic processing of water and liquid aluminium.
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DOI：
10.1016/j.ultsonch.2021.105647
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发表时间：
2021-08
影响因子：
8.4
通讯作者：
Tzanakis I
中科院分区：
文献类型：
--
作者：
Khavari M;Priyadarshi A;Subroto T;Beckwith C;Pericleous K;Eskin DG;Tzanakis I
按比例放大超声空化熔体处理（UST）需要以最小的能量需求进行有效的流量管理。为此，导致共振的容器尺寸在放大空化的压力振幅中起着至关重要的作用。为了量化液态铝处理过程中共振长度的重要性，我们使用校准的高温空化计（在8-400 kHz的范围内），以测量和记录在19.5 kHz激发的液态铝和去离子水（用作铝的模拟物）的空化诱导环境内的声压分布。为了实现声压场的全面映射，在相对于振动的超声波发生器探头的三个不同的空化计位置处进行测量，并且基于处理介质中的声速针对多个共振和非共振容器长度进行测量。结果表明，共振长度影响空泡计各位置的压力大小，而水对共振长度不敏感。超声波在铝加工中的一个重要实际应用涉及晶粒细化。出于这个原因，UST处理的Al-Cu-Zr-Ti合金的晶粒尺寸分析被用作熔体处理效率的指标。结果表明，与其他测试长度相比，在（Al中的声波波长）的谐振槽中的处理给出了最佳的结构细化。这里给出的数据有助于在连续铸造中的超声波工艺的优化，通过提供关键隔室（例如，在直接激冷铸造的流槽中）尺寸的最佳值。
Scaling up ultrasonic cavitation melt treatment (UST) requires effective flow management with minimised energy requirements. To this end, container dimensions leading to the resonance play a crucial role in amplifying pressure amplitude for cavitation. To quantify the importance of resonance length during the treatment of liquid aluminium, we used calibrated high-temperature cavitometers (in the range of 8–400 kHz), to measure and record the acoustic pressure profiles inside the cavitation-induced environment of liquid Al and deionized water (used as an analogue to Al) excited at 19.5 kHz. To achieve a comprehensive map of the acoustic pressure field, measurements were conducted at three different cavitometer positions relative to the vibrating sonotrode probe and for a number of resonant and non-resonant container lengths based on the speed of sound in the treated medium. The results showed that the resonance length affected the pressure magnitude in liquid Al in all cavitometer positions, while water showed no sensitivity to resonance length. An important practical application of UST in aluminium processing concerns grain refinement. For this reason, grain size analysis of UST-treated Al-Cu-Zr-Ti alloy was used as an indicator of the melt treatment efficiency. The result showed that the treatment in a resonance tank of (the wavelength of sound in Al) gave the best structure refinement as compared to other tested lengths. The data given here contribute to the optimisation of the ultrasonic process in continuous casting, by providing an optimum value for the critical compartment (e.g. in a launder of direct-chill casting) dimension.
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