Search

Article

x

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

Experimental study of the settling and melting characteristics of equiaxed crystals in a falling tube

Zhou Peng Wang Meng Lin Xin Chen Lei Qiu Feng Huang Wei-Dong

Experimental study of the settling and melting characteristics of equiaxed crystals in a falling tube

Zhou Peng, Wang Meng, Lin Xin, Chen Lei, Qiu Feng, Huang Wei-Dong
PDF
Get Citation

(PLEASE TRANSLATE TO ENGLISH

BY GOOGLE TRANSLATE IF NEEDED.)

Metrics
  • Abstract views:  1199
  • PDF Downloads:  469
  • Cited By: 0
Publishing process
  • Received Date:  01 July 2012
  • Accepted Date:  17 August 2012
  • Published Online:  05 January 2013

Experimental study of the settling and melting characteristics of equiaxed crystals in a falling tube

  • 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Fund Project:  Project supported by the National Basic Research Program of China (Grant No. 2011CB10402), the National Natural Science Foundation of China (Grant Nos. 50901061, 50971102) and the Foundation of State Key Laboratory of Solidification Processing, China (Grant Nos. 02-TZ-2008, 36-TP-2009).

Abstract: The morphology evolution of NH4Cl equiaxed crystal settling in a falling tube filling with its superheated aqueous solution is studied. The effects of superheating and initial crystal size on settling rate and melting velocity are analyzed. The results show that for a non-spinning equiaxed crystal, it will transform from a "quasi-symmetrical" morphology to "quasi-delta" morphology, and for a spinning equiaxed crystal, it is more likely to sustain its initial "quasi-symmetrical" morphology. By analyzing the drag coefficients of equiaxed crystals settling in the solution at different superheating degrees, it is found that higher superheating leads to a smoother shape of the equiaxed crystal, thus increasing its settling rate. For a large equiaxed crystal, higher complexity in shape and increase in settling velocity will lead to a higher melting velocity. In the settling process of crystal in superheated melt, the solute transport condition on the melting interface is weakened by the gradually reducing the settling velocity, resulting in a relatively steady melting velocity for a certain equiaxed crystal.

Reference (26)

Catalog

    /

    返回文章
    返回