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Effects of Aspect Ratio on Diffusive-Convection During Physical Vapor Transport of Hg2Cl2 with Impurity of NO

염화제일수은과 일산화질소의 물리적 승화법 공정에서의 확산-대류에 미치는 에스펙트 비율의 영향

  • Kim, Geug-Tae (Department of Advanced Materials and Chemical Engineering, Hannam University)
  • 김극태 (한남대학교 화공신소재공학과)
  • Received : 2015.10.14
  • Accepted : 2015.11.10
  • Published : 2015.12.10

Abstract

This study investigates the effects of aspect ratio (transport length-to-width) on diffusive-convection for physical vapor transport processes of $Hg_2Cl_2-NO$ 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 $g_0$ is greater twice than at the level of 0.1 $g_0$, 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

Acknowledgement

Supported by : Hannam University

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