Multiphysics Modelling of Ultrasonic Melt Treatment in the Hot-Top and Launder during Direct-Chill Casting: Path to Indirect Microstructure Simulation

被引:7
|
作者
Beckwith, Christopher [1 ]
Djambazov, Georgi [1 ]
Pericleous, Koulis [1 ]
Subroto, Tungky [2 ]
Eskin, Dmitry G. [2 ,3 ]
Roberts, Dan [4 ]
Skalicky, Ivan [4 ]
Tzanakis, Iakovos [5 ,6 ]
机构
[1] Univ Greenwich, Computat Sci & Engn Grp, 30 Pk Row, London SE10 9LS, England
[2] Brunel Univ London, Brunel Ctr Adv Solidificat Technol BCAST, Uxbridge UB8 3PH, Middx, England
[3] Tomsk State Univ, Fac Phys & Engn, Dept Math Phys, Tomsk 634050, Russia
[4] Brunel Univ London, Constellium UTC, Uxbridge UB8 3PH, Middx, England
[5] Oxford Brookes Univ, Fac Technol Design & Environm, Oxford OX33 1HX, England
[6] Univ Oxford, Dept Mat, Oxford OX1 3PH, England
基金
英国工程与自然科学研究理事会;
关键词
ultrasonic processing; DC casting; cavitation; Lagrangian tracking; NONLINEAR HELMHOLTZ-EQUATION; STRICT FORMULATION; GRAIN-REFINEMENT; PROPAGATION; PRESSURE; ALUMINUM; SOUND;
D O I
10.3390/met11050674
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study concerns the numerical simulation of two competing ultrasonic treatment (UST) strategies for microstructure refinement in the direct-chill (DC) casting of aluminium alloys. In the first, more conventional, case, the sonotrode vibrating at 17.3 kHz is immersed in the hop-top to treat the sump melt pool, in the second case, the sonotrode is inserted between baffles in the launder. It is known that microstructure refinement depends on the intensity of acoustic cavitation and the residence time of the treated fluid in the cavitation zone. The geometry, acoustic field intensity, induced flow velocities, and local temperature are factors which affect this treatment. The mathematical model developed in this work couples flow velocity, acoustics modified by cavitation, heat transfer, and solidification at the macroscale, with Lagrangian refiner particles, used to determine: (a) their residence time in the active zones, and (b) their eventual distribution in the sump as a function of the velocity field. This is the first attempt at using particle models as an efficient, though indirect, alternative to microstructure simulation, and the results indicate that UST in the launder, assisted with baffle separators, yields a more uniform distribution of refining particles, avoiding the strong acoustic streaming jet that, otherwise, accompanies hot-top treatment, and may lead to the strong segregation of refining particles. Experiments conducted in parallel to the numerical studies in this work appeared to support the results obtained in the simulation.
引用
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页数:14
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