QQ客服 官方微博 反馈留言

	Modelling of the thermosolutal convection and macrosegregation in the solidification of an Fe-C binary alloy
	Han, Z.Q. ; Lewis, R.W. ; Liu, B.C.
	2010-05-10 ; 2010-05-10
关键词	Theoretical or Mathematical/ carbon casting channel flow convection finite difference methods flow simulation iron alloys segregation solidification two-phase flow/ thermosolutal convection macrosegregation solidification binary alloy casting numerical simulation mass conservation equation momentum conservation equation energy conservation equation species conservation equation control volume-based finite difference method upwind scheme tridiagonal matrix algorithm velocity-pressure coupling SIMPLE algorithm liquid flow dendritic front channel segregation crystal movement FeC/ A4725Q Convection and heat transfer A4755K Multiphase flows A4760 Flows in ducts, channels, and conduits A4710 General fluid dynamics theory, simulation and other computational methods A4785 Applied fluid mechanics A6470D Solid-liquid transitions A6475 Solubility, segregation, and mixing A0260 Numerical approximation and analysis E2130 Fluid mechanics and aerodynamics (mechanical engineering) E2120 Heat and thermodynamic processes (mechanical engineering) E1520G Forming processes E0210L Numerical analysis/ FeC/bin Fe/bin C/bin
中文摘要	Purpose - The motivation for this work is to establish a model that not only includes the main factors resulting in macrosegregation but also retains simplicity and consistency for the sake of potential application in casting practice. Design/methodology/approach - A mathematical model for the numerical simulation of thermosolutal convection and macrosegregation in the solidification of multicomponent alloys is developed, in which the coupled macroscopic mass, momentum, energy and species conservation equations are solved. The conservation equations are discretized by using the control volume-based finite difference method, in which an up-wind scheme is adopted to deal with the convection term. The alternative direction implicit procedure and a line-by-line solver, based on the tri-diagonal matrix algorithm, are employed to iteratively solve the algebraic equations. The velocity-pressure coupling is handled by using the SIMPLE algorithm. Findings - Based on the present study, the liquid flow near the dendritic front is believed to play an important role in large-scale transport of the solute species. The numerical or experimental results in the literatures on the formation of channel segregation, especially those about the location of the initial flow as well as the morphology of the liquidus front, are well supported by the present investigation. Research limitations/implications - The modelling is limited to dealing with the thermosolutal convection of two-dimensional cases. More complicated phenomena (e.g. crystal movement) and 3D geometry should be considered in future research. Practical implications - The present model can be used to analyze the effects of process parameters on macrosegregation and, with further development, could be applied as a useful tool in casting practice. Originality/value - The numerical simulation demonstrates the capability of the model to simulate the thermosolutal convection and macrosegregation in alloy solidification. It also shows that the present model has good application potential in the prediction and control of channel segregation.
语种	英语 ; 英语
出版者	Emerald ; UK
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/24297]
专题	清华大学
推荐引用方式 GB/T 7714	Han, Z.Q.,Lewis, R.W.,Liu, B.C.. Modelling of the thermosolutal convection and macrosegregation in the solidification of an Fe-C binary alloy[J],2010, 2010.
APA	Han, Z.Q.,Lewis, R.W.,&Liu, B.C..(2010).Modelling of the thermosolutal convection and macrosegregation in the solidification of an Fe-C binary alloy..
MLA	Han, Z.Q.,et al."Modelling of the thermosolutal convection and macrosegregation in the solidification of an Fe-C binary alloy".(2010).

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。