Fundamental studies on cavitation melt processing

[摘要] The application of ultrasound to industrial casting processes has attracted research interest during the last 50 years. However, the transfer and scale-up of this advanced and promising technology to industry has been hindered by difficulties in treating large volumes of liquid metal due to the lack of understanding of certain fundamentals. In the current study experimental results on ultrasonic processing in deionised water and in liquid aluminium (Al) are reported. Cavitation activity was determined in both liquid environments and acoustic pressures were successfully measured using an advanced high-temperature cavitometer sensor. Results showed that highest cavitation intensity in the liquid bulk is achieved at lower amplitudes of the sonotrode tip than the maximum available, suggesting nonlinearity in energy transfer to the liquid, while the location of the sonotrode is seen to substantially affect cavitation activity within the liquid. Estimation of real-time acoustic pressures distributed inside a crucible with liquid Al was performed for the first time.

[发布机构] Brunei Centre for Advanced Solidification Technology (BCAST), Brunei University, Uxbridge, Middlesex; UB8 3PH, United Kingdom^1;Acoustics and Ionising Radiation Division, National Physical Laboratory, Hampton Road, Teddington, Middlesex; TW11 0LW, United Kingdom^2;Centre for Numerical Modelling and Process Analysis, University of Greenwich, London; SE10 9LS, United Kingdom^3

[效力级别] 工业技术 [学科分类] 工业工程学

[关键词] Acoustic pressures;Cavitation activity;Cavitation intensity;Fundamental studies;Industrial casting;Liquid environment;Research interests;Ultrasonic processing