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Chin. Phys. B, 2013, Vol. 22(1): 018101    DOI: 10.1088/1674-1056/22/1/018101
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Settling velocity of equiaxed dendrites in a tube

Zhou Peng (周鹏), Wang Meng (王猛), Lin Xin (林鑫), Huang Wei-Dong (黄卫东)
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Abstract  The settling velocity of equiaxed dendrites can cause macrosegregation and influence the structure of the equiaxed zone during the casting solidification process. So an understanding of the settling characteristics is needed to predict the structure and segregation in castings. The settling velocity of NH4Cl equiaxed dendrites of non-spherical geometry was studied experimentally in an NH4Cl-70wt.%H2O solution. A calculation formula was proposed to calculate the settling velocity of sediment equiaxed dendrites in a tube filling with saturated solution at a moderate Reynolds number region. The retardation effects of wall and morphology of the equiaxed dendrite on the settling velocity were taken into account in the development of the calculation formula, and the correction function B of drag coefficient with consideration of the retardation effects of wall and morphology of the equiaxed dendrite on the settling velocity of the equiaxed dendrite was calibrated according to the experimental results. A comparison showed that the formula has a good accordance with the experimental results.
Keywords:  equiaxed dendrite      settling velocity      morphology effect      wall effect  
Received:  08 August 2012      Revised:  31 October 2012      Accepted manuscript online: 
PACS:  81.05.Bx (Metals, semimetals, and alloys)  
  47.50.Cd (Modeling)  
  47.57.ef (Sedimentation and migration)  
Fund: Project supported by the National Basic Research Program of China (Grant No. 2011CB10402), the National Natural Science Foundation of China (Grant Nos. 50901061 and 50971102), and the Foundation of State Key Laboratory of Solidification Processing, China (Grant Nos. 02-TZ-2008 and 36-TP-2009).
Corresponding Authors:  Wang Meng     E-mail:  wangmeng@nwpu.edu.cn

Cite this article: 

Zhou Peng (周鹏), Wang Meng (王猛), Lin Xin (林鑫), Huang Wei-Dong (黄卫东) Settling velocity of equiaxed dendrites in a tube 2013 Chin. Phys. B 22 018101

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