Simulation of convective flow and thermal conditions during ultrasonic treatment of an Al-2Cu alloy

Wang, Gui, Croaker, Paul, Dargusch, Matthew, McGuckin, Damian and StJohn, David (2017) Simulation of convective flow and thermal conditions during ultrasonic treatment of an Al-2Cu alloy. Computational Materials Science, 134 116-125. doi:10.1016/j.commatsci.2017.03.041


Author Wang, Gui
Croaker, Paul
Dargusch, Matthew
McGuckin, Damian
StJohn, David
Title Simulation of convective flow and thermal conditions during ultrasonic treatment of an Al-2Cu alloy
Journal name Computational Materials Science   Check publisher's open access policy
ISSN 0927-0256
Publication date 2017-06-15
Sub-type Article (original research)
DOI 10.1016/j.commatsci.2017.03.041
Open Access Status Not yet assessed
Volume 134
Start page 116
End page 125
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Collection year 2018
Language eng
Abstract Grain refinement of an Al-2Cu alloy using ultrasonic treatment was investigated numerically. A finite element model coupling fluid flow and heat transfer was developed and validated by comparing the results of both numerical simulations and physical experiments. The model successfully describes hydrodynamic fields generated by ultrasonic treatment and its influence on heat transfer. The simulations were used to study the influence of the duration of ultrasonic treatment and the associated acoustic streaming on convection and the resulting temperature distribution. It was revealed that a relatively cold sonotrode applied during ultrasonic treatment for up to 4 min created a casting environment that promoted crystal nucleation and enabled their growth and survival during transport of these grains into the bulk of the melt by strong convection. The enhanced convection established a low temperature gradient throughout the melt which favours the formation of an equiaxed grain structure. Therefore, the convection induced by acoustic streaming plays a critical role in facilitating nucleation, growth, and transport of grains.
Keyword Acoustic streaming
Aluminium alloy
Grain refinement
Solidification
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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