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수직 방향 응고시에 열-용질 대류의 발생
The Onset of Thermosolutal Convection during Upwards Solidification
HWAHAK KONGHAK, December 1991, 29(6), 727-735(9), NONE
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Abstract
이성분 용융액의 수직 방향 응고시에 열-용질 대류의 발생에 대해 선형 안정성 이론을 근거로 조사하였다. 본 연구의 주요한 관심은 열-용질 대류 발생에 있어 온도의 안정화 효과이다. 열 Rayleigh수가 증가하면 임계 용질 Rayleigh수가 증가하는 결과로부터 열 Rayleigh수가 증가가 대류발생에 안정화 효과를 주는 것을 알았다. 또한 Lewis수나 Schmidt수가 커지면 계는 불안정해지고, 대류 발생시에는 계면 가까운 곳에 한정되는 다중셀 대류가 나타남을 알 수 있었다. 열 Rayleigh수가 증가함에 따라 이러한 열-용질 대류는 점점 응고 계면에 가까운 곳에서 발생하게 되며 다중셀의 경향이 더 나타났다.
The onset of thermosolutal convection during upwards solidification of a binary melt is investiga-ted by using linear stability theory. The present study concerns the stabilizing effect of temperature on the onset of thermosolutal convection. The results show that the critical solutal Rayleigh number increases with increasing the thermal Rayleigh number. This reflects the fact that an increase in thermal Rayleigh number makes the system more stable, while the system becomes more unstable with an increase in Lewis number or schmidt number. Multicell convection is exhibited at onset condition and this thermosolutal convec-tion is confined mainly to the vicinity of the interface. With increasing the thermal Rayleigh number, this trend becomes more pronounced with multicell patterns more distinguished.
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