کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9877650 | 1534088 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Front instability and pattern dynamics in the phase-field model for crystal growth
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
ریاضیات کاربردی
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چکیده انگلیسی
We study front instability and the pattern dynamics in the phase-field model with four-fold rotational symmetry. When the undercooling Î is 1<Î<Îc, the flat interface is linearly unstable, and the deformation of the interface evolves to spatio-temporal chaos or nearly stationary cellular structures appear, depending on the growth direction. When Î<1, the flat interface grows with a power law xâ¼t1/2 and the growth rates of linear perturbations with finite wave number q decay to negative values. It implies that the flat interface is linearly stable as tââ, if the width of the interface is finite. However, the perturbations around the flat interface actually grow since the linear growth rates take positive values for a long time, and the flat interface changes into an array of doublons or dendrites. The competitive dynamics among many dendrites is studied more in detail.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica D: Nonlinear Phenomena - Volume 205, Issues 1â4, 1 June 2005, Pages 222-232
Journal: Physica D: Nonlinear Phenomena - Volume 205, Issues 1â4, 1 June 2005, Pages 222-232
نویسندگان
Hidetsugu Sakaguchi, Seiji Tokunaga,