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Essence of thermal convection for physical vapor transport of mercurous chloride in regionsof high vapor pressures

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2007, 17(6), pp.231-237
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Geug Tae Kim 1 Jeong-Gil Choi 1 Kyong-Hwan Lee 2

1한남대학교
2한국에너지기술연구원

Accredited

ABSTRACT

For an aspect ratio (transport length-to-width) of 5, Pr = 3.34, Le = 0.078, Pe = 4.16, Cv = 1.01, PB = 50 Torr, only thermally buoyancy-driven convection (Gr = 4.83 × 10 5 ) is considered in this study in spite of the disparity in the molecular weights of the component A (Hg2Cl2) and B which would cause thermally and/or solutally buoyancy-driven convection. The crystal growth rate and the maximum velocity vector magnitude are decreased exponentially for 3 ≤ Ar ≤ 5, for (1) adiabatic walls and (2) the linear temperature profile, with a fixed source temperature. This is related to the finding that the effects of side walls tend to stabilize convection in the growth reactor. The rate for the linear temperature profiles walls is slightly greater than for the adiabatic walls for varied temperature differences and aspect ratios. With the imposed thermal profile, a fixed source region, both the rate and the maximum velocity vector magnitude increase linearly with increasing the temperature difference for 10 ≤ ΔT ≤ 50 K.e

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