브로민화 수은 (I)(Hg2Br2) 물리적 증착공정에서 온도농도대류의 기초연구
Fundamental studies on thermosolutal convection in mercurous bromide (Hg2Br2) physical vapor transport processes
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브로민화 수은 (I)(Hg₂Br₂) 물리적 증착법 공정에서 구성요소 B의 분압 , PB를 40 Torr에서 200 Torr로 증가시켰을때 1개의 셀(unicell)이 결정성장영역에서 기체상 공간의 중심으로 이동함을 보여주고 있다. PB =40 Torr에서는 경계층 흐름이 지배적이고, PB =200 Torr에서는 코어영역흐름 (core region)을 보이고 있다. 고려되는 물리적 증착법 공정에서 PB =40 Torr와 PB =200Torr에서 1개(single)의 셀(cell) 형태로 3차원의 유동의 흐름과 x, y 직교 중심축에 대하여 비대칭 유동흐름을 나타내고 있다. 소스와 결정 영역 사이의 임계 온도차는 약 30K입니다. Hg₂Br₂의 총 몰 플럭스는 임계값에 도달할 때까지 온도차에 따라 증가한다. 임계 총 몰 플럭스에서 총 몰 플럭스는 갑자기 감소한다.
Abstract
During the Hg₂Br₂ physical vapor transport process, with increasing the partial pressure of component B, PB from 40 Torr to 200 Torr, a unicellular convective flow structures move from the crystal growth region to the center region in the vapor phase. The boundary layer flow is dominant for PB = 40 Torr, and the core region flow is dominant for PB = 200 Torr. The flow in the vapor phase shows a three-dimensional convective flow structure with a single cell (unicellular) for PB = 40 Torr and 200 Torr, exhibits an asymmetrical flow with respect to the x, y central axis under the horizontally oriented configuration with an aspect ratio (length-to-width) of 3 and linear conducting walls. The critical temperature difference between the source and crystal region is about 30 K. The total molar flux of Hg₂Br₂ increases with the temperature difference until the total molar flux reaches the critical value. At the critical total molar flux, the total molar flux abruptly decreases.
참고문헌 (10)
- N. B. Singh, "Mercurous bromide acoustooptic devices", J. Cryst. Growth, 89, pp.527~ (1988)
- N. B. Singh, "Growth and characterization of mercurous halide crystals : mercurous bromide system", J. Cryst. Growth, 137, pp.155~ (1994)
- Tae Hyeon Kim, "In-depth Investigation of Hg2Br2 Crystal Growth and Evolution", Materials, 12(24), pp.4224~ (2019), MDPI AG[DOI]
- Ojun Kwon, "Comparative Analysis of Hg2Br2 and Hg2BrxCl2-x Crystals Grown via PVT", Crystals, 10(12), pp.1096~ (2020), MDPI AG[DOI]
- W. M. B. Duval, "Convective effects during the physical vapor transport process--I : Thermal convection", J. Mater. Processing Manu. Sci, 1, pp.83~ (1992)
- W. M. B. Duval, "Convective effects during the physical vapor transport process--II : Thermosolutal convection", J. Mater. Processing Manu. Sci, 1, pp.295~ (1993)
- W. M. B. Duval, "Transition to chaos in the physical vapor transport process - I", proceeding of the ASME-WAM winter Annual Meeting, Symposium in fluid mechanics phenomena in microgravity, ASME-WAM (1993)
- W. M. B. Duval, "Physical vapor transport of mercurous chloride crystals : design of a microgravity experiment", J. Cryst. Growth, 174, pp.120~ (1997)
- W. M. B. Duval, "Mixing driven by transient buoyancy flows. I. Kinematics", Physics of Fluids, 30(5), pp.054104~ (2018), AIP Publishing[DOI]
- W. M. B. Duval, "Mixing driven by transient buoyancy flows.II. Flow dynamics", AIP Advances, 11(8), pp.085118~ (2021), AIP Publishing[DOI]