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Received January 8, 2019
Accepted February 7, 2019
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Preliminary Studies on Double-Diffusive Natural Convection During Physical Vapor Transport Crystal Growth of Hg2Br2 for the Spaceflight Experiments
Department of Advanced Materials and Chemical Engineering, Hannam University, 1646, Yuseong-daero, Yuseong-gu, Daejeon, 34054, Korea
geugtaekim@gmail.com
Korean Chemical Engineering Research, April 2019, 57(2), 289-300(12), 10.9713/kcer.2019.57.2.289 Epub 5 April 2019
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Abstract
We have conducted a preliminary numerical analysis to understand the effects of double-diffusive convection on the molar flux at the crystal region during the growth of mercurous bromide (Hg2Br2) crystals in 1 g and microgravity (μg) conditions. It was found that the total molar fluxes decay first-order exponentially with the aspect ratio (AR, transport length-to-width), 1 ≤ AR ≤ 10. With increasing the aspect ratio of the horizontal enclosure from AR = 1 up to Ar = 10, the convection flow field shifts to the advective-diffusion mode and the flow structures become stable. Therefore, altering the aspect ratio of the enclosure allows one to control the effect of the double diffusive natural convection. Moreover, microgravity environments less than 10-2g make the effect of double-diffusive natural convection much reduced so that the convection mode could be switched over the advective-diffusion mode.
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Kim GT, Duval WMB, Glicksman ME, Model. Simul. Mater. Sci. Eng., 5, 289 (1997)
Kim GT, Duval WMB, Glicksman ME, Chem. Eng. Commun., 162, 45 (1997)
Tebbe PA, Loyalka SK, Duval WMB, Finite Elements in Analysis and Design, 40, 1499-1519(2004).
Singh NB, Gottlieb M, Goutzoulis AP, Hopkins RH, Mazelsky R, J. Cryst. Growth, 89, 527 (1988)
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Amarasinghe PM, Kim JS, Chen H, Trivedi S, Qadri SB, Soos J, Diestler M, Zhang DJ, Gupta N, Jensen JL, Jensen J, J. Cryst. Growth, 450, 96 (2016)
Shi YG, Yang JF, Liu HL, Dai PY, Liu BB, Jin ZH, Qiao GJ, Li HL, J. Cryst. Growth, 349(1), 68 (2012)
Fanton MA, Li Q, Polyakov AY, Skowronski M, Cavalero R, Ray R, J. Cryst. Growth, 287(2), 339 (2006)
Paorici C, Razzetti C, Zha M, Zanotti L, Carotenuto L, Ceglia M, Mater. Chem. Phys., 66(2-3), 132 (2000)
Rosenberger F, Muller G, J. Cryst. Growth, 65, 91 (1983)
Markham BL, Rosenberger F, Chem. Eng. Commun., 5, 287 (1980)
Bird RB, Stewart WE, Lightfoot EN, Transport Phenomena, John Wiley and Sons, New York, NY (1960).
Reid RC, Prausnitz JM, Poling BE, The Properties of Gases & Liquids, 4th ed., McGraw-Hill, New York, NY(1987).
Oppermann H, Proceedings of the 2nd Int’l Symposium on Univalent Mercury Halides, Czechoslovakia (1989).
Weaver JA, Viskanta R, Int. J. Heat Mass Transf., 34, 3107 (1991)
Patankar SV, Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing Corp., Washington D. C.(1980).
Catton I, J. Heat Transfer, 94, 446 (1974)
Nadarajah A, Rosenberger F, Alexander J, J. Cryst. Growth, 118, 49 (1992)
Kim GT, Kwon MH, Korean Chem. Eng. Res., 52(1), 75 (2014)
Singh NB, Gottlieb M, Hopkins RH, Mazelsky R, Duval WMB, Glicksman ME, Prog. Crystal Growth Charact., 27, 201 (1993)
