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	侧向凝固通道偏析的数值模拟
	曹海峰 ; 沈厚发 ; 柳百成 ; CAO Haifeng ; SHEN Houfa ; LIU Baicheng
	2010-06-08 ; 2010-06-08
关键词	凝固 通道偏析 数值模拟 双扩散对流 局部流动 solidification,segregation in channel, numerical simulation, double-diffusive convection, plume TG111.4
其他题名	NUMERICAL SIMULATION OF SEGREGATION IN CHANNEL DURING HORIZONTAL SOLIDIFICATION
中文摘要	建立了二元系凝固过程通道偏析形成的数学模型,给出了描述焓与温度及固相分数耦合关系的表达式.在实验验证的基础上,对亚共晶与过共晶成分的NH4Cl-H2O侧向凝固通道偏析的形成位置与生长方向进行了数值模拟研究.模拟计算结果表明,偏析通道起源于糊状区,偏析通道中的富集溶质从糊状区流向液相区.为了维持偏析通道中的液体流动,枝晶间液体可通过糊状区从液相区得到补充.糊状区中富集溶质的流动方向取决于析出溶质的密度.NH4Cl-70%H2O侧向凝固时,析出的溶质密度较小,偏析通道倾斜向上生长,在糊状区上部形成A偏析.NH4Cl-90%H2O侧向凝固时,析出的溶质密度较大,在糊状区下部偏析通道倾斜向下生长.; A mathematical model for the segregation formation in channel during solidification process of binary alloys has been built and a set of expressions coupling the temperature and solid fraction with enthalpy is determined. The formation position and growth direction of the segregation during the horizontal solidification of NH4Cl-H2O with hypoeutectic and hypereutectic compositions are numerically studied based on the experiment. The simulation results show that the segregation originates from the mushy zone and the solute-rich liquid flows from mush into liquid. In order to supply the mass equilibrium in the channels, the fresher liquid may penetrate via the mushy zone from pure liquid region. The flow direction of solute-rich liquid in mush depends on its density. Because of the lower density of the rejected solute during the horizontal solidification of NH4C1-70%H2O, channels grow slantways and upwards and A type segregates form in the upper region of mush. While the density of the rejected solute during the horizontal solidification of NH4C1-90%H2O, channels grow slantways and downwards in the lower region of mush.; 国家自然科学重大基金项目59990470-3; 国家重点基础研究发展规划项目G2000067208-3资助
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/48446]
专题	清华大学
推荐引用方式 GB/T 7714	曹海峰,沈厚发,柳百成,等. 侧向凝固通道偏析的数值模拟[J],2010, 2010.
APA	曹海峰,沈厚发,柳百成,CAO Haifeng,SHEN Houfa,&LIU Baicheng.(2010).侧向凝固通道偏析的数值模拟..
MLA	曹海峰,et al."侧向凝固通道偏析的数值模拟".(2010).

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