scholarly journals Effects of anisotropic interface kinetics and surface tension on deep cellular crystal growth in directional solidification

2017 ◽  
Vol 66 (10) ◽  
pp. 106801
Author(s):  
Jiang Han ◽  
Chen Ming-Wen ◽  
Wang Tao ◽  
Wang Zi-Dong
Keyword(s):  
Surface Tension ◽  
Crystal Growth ◽  
Directional Solidification ◽  
Interface Kinetics

Effect of anisotropy on deep cellular crystal growth in directional solidification

2016 ◽  
Vol 30 (17) ◽  
pp. 1650205 ◽  
Author(s):  
Han Jiang ◽  
Ming-Wen Chen ◽  
Guo-Dong Shi ◽  
Tao Wang ◽  
Zi-Dong Wang
Keyword(s):  
Crystal Growth ◽  
Directional Solidification ◽  
Expansion Method ◽  
Matched Asymptotic Expansion ◽  
Curvature Radius ◽  
Root Depth ◽  
Anisotropic Surface ◽  
Interface Kinetics ◽  
Multiple Variable ◽  
Asymptotic Expansion Method

The effect of anisotropic surface tension and anisotropic interface kinetics on deep cellular crystal growth is studied. An asymptotic solution of deep cellular crystal growth in directional solidification is obtained by using the matched asymptotic expansion method and the multiple variable expansion method. The results show that as the anisotropic parameters increase, the total length of deep cellular crystal increases and the root depth increases, whereas the curvature of the interface near the root increases or the curvature radius decreases.

scholarly journals Effect of anisotropic surface tension on deep cellular crystal growth in directional solidification

2014 ◽  
Vol 63 (3) ◽  
pp. 038101
Author(s):  
Chen Ming-Wen ◽  
Chen Yi-Chen ◽  
Zhang Wen-Long ◽  
Liu Xiu-Min ◽  
Wang Zi-Dong
Keyword(s):  
Surface Tension ◽  
Crystal Growth ◽  
Directional Solidification ◽  
Anisotropic Surface

EFFECT OF ANISOTROPIC SURFACE TENSION ON THE MORPHOLOGICAL STABILITY OF DEEP CELLULAR CRYSTAL GROWTH IN DIRECTIONAL SOLIDIFICATION

2019 ◽  
Vol 26 (06) ◽  
pp. 1850210
Author(s):  
HAN JIANG ◽  
MING-WEN CHEN ◽  
ZI-DONG WANG
Keyword(s):  
Surface Tension ◽  
Crystal Growth ◽  
Directional Solidification ◽  
Low Frequency ◽  
Expansion Method ◽  
Frequency Instability ◽  
Morphological Stability ◽  
Global Instability ◽  
Anisotropic Surface ◽  
Low Frequency Instability

This paper studies the effect of anisotropic surface tension on the morphological stability of deep cellular crystal in directional solidification by using the matched asymptotic expansion method and multiple variable expansion method. We find that the morphological stability of deep cellular crystal growth with anisotropic surface tension shows the same mechanism as that with isotropic surface tension. The deep cellular crystal growth contains two types of global instability mechanisms: the global oscillatory instability, whose neutral modes yield strong oscillatory dendritic structures, and the low-frequency instability, whose neutral modes yield weakly oscillatory cellular structures. Anisotropic surface tension has the significant effect on the two global instability mechanisms. As the anisotropic surface tension increases, the unstable domain of global oscillatory instability decreases, whereas the unstable domain of the global low-frequency instability increases.

Optimization of Bulk Hgcdte Growth in a Directional Solidification Furnace by Numerical Simulation

1995 ◽  
Vol 398 ◽  
Author(s):  
A.V. Bune ◽  
D.C. Gillies ◽  
S.L. Lehoczky
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Finite Element ◽  
Crystal Growth ◽  
Numerical Model ◽  
Directional Solidification ◽  
Growth Conditions ◽  
Finite Element Code ◽  
Interface Shape ◽  
Solidification Furnace

ABSTRACTA numerical model of heat transfer by combined conduction, radiation and convection was developed using the FIDAP finite element code for NASA's Advanced Automated Directional Solidification Furnace (AADSF). The prediction of the temperature gradient in an ampoule with HgCdTe is a necessity for the evaluation of whether or not the temperature set points for furnace heaters and the details of cartridge design ensure optimal crystal growth conditions for this material and size of crystal. A prediction of crystal/melt interface shape and the flow patterns in HgCdTe are available using a separate complementary model.

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