화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.26, No.6, 746-752, December, 2015
DOI10.14478/ace.2015.1112  Export Citation
염화제일수은과 일산화질소의 물리적 승화법 공정에서의 확산-대류에 미치는 에스펙트 비율의 영향
Effects of Aspect Ratio on Diffusive-Convection During Physical Vapor Transport of Hg2Cl2 with Impurity of NO
김극태†
  • 한남대학교 화공신소재공학과
Geug-Tae Kim†
  • Department of Advanced Materials and Chemical Engineering, Hannam University, 1646, Yuseong-daero, Yuseong-gu, Daejeon, 34054 Rep. of KOREA, Korea
E-mail:
초록
본 연구에서는 Hg2Cl2-NO의 물리적 승화법 공정에서의 확산-대류에 미치는 에스펙트 비율(길이/폭)의 영향에 대한 것이다. 원료물질 영역과 결정영역에서의 온도 차 20 K, 벽에서의 선형 온도분포를 가진 계에서, 대류의 영향 때문에, 총몰플럭스와 상호계면에서의 비균일성에 관하여서는, 에스펙트 비율이 2인 경우가 비율이 5인 경우보다 상당히 크다. 지상중력 하에서의 최고 총몰플럭스는 지상중력의 0.1 상태에 비하여 대략 2배 정도 크다. 에스펙트 비율을 2에서 5로 증가시켰을 때, 확산-대류형이 대류형으로 전이되며, 또한 확산의 강도도 확산-대류형의 강도를 지배하게 된다.
This study investigates the effects of aspect ratio (transport length-to-width) on diffusive-convection for physical vapor transport processes of Hg2Cl2-NO system. For a system with the temperature difference of 20 K between an interface at the source material region and growing crystal interface, the linear temperature profiles at walls, the total molar fluxes at Ar = 2 are much greater than Ar = 5 as well as the corresponding nonuniformities in interfacial distributions due to the effect of convection. The maximum total molar flux at the gravitational acceleration of 1 g0 is greater twice than at the level of 0.1 g0, where g0 denotes the gravitational acceleration on earth. With increasing aspect ratio from 2 to 5, a diffusive-convection mode is transited into the diffusion mode, and then the strength of diffusion is predominant over the strength of diffusive-convection.
Keywords:aspect ratio;physical vapor transport
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