Abstract
Steady state temperature distribution in a model Czochralski crucible has been mapped by liquid crystal thermography (LCT). The crucible is a water-filled glass beaker. Water is used as the test fluid because of ease of experimentation, as well as the availability of correct thermo-physical properties. In addition, the Prandtl number of water matches those of molten oxides. A copper cylinder whose diameter is smaller than that of the beaker is placed centrally at the water surface. Convection patterns are set up by applying constant temperature difference between the crucible wall and the cylinder surface, in the temperature range of the liquid crystals. The cylinder is given a fixed rotation, thus creating mixed convection conditions in the test fluid. The LCT images recorded in the present study clearly reveal convective rolls, and the interaction of buoyancy-driven convection in the crucible with cylinder rotation. The resulting temperature distributions match numerical simulation quite well. The pure buoyancy and pure rotation experiments result in axisymmetric temperature fields, while in mixed convection, the field is unsteady and three dimensional.
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Banerjee, Jyotirmay: He completed his doctoral thesis on “Czochralski Growth of Oxide Crystals: Numerical Simulation and Experiments” in the Department of Mechanical Engineering, IIT Kanpur (India) in January 2005. He is a lecturer in Mechanical Engineering at SVNIT, Surat (India).
Bharadwaj, R.: He is a doctoral student in the Department of Mechanical Engineering, SUNY, New York. Earlier he was a project associate at IIT Kanpur (India).
Muralidhar, K.: He is a Professor of Mechanical Engineering at IIT Kanpur (India). His research interests are in laser measurements, crystal growth, and transport phenomena in porous media.
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Banerjee, J., Bharadwaj, R. & Muralidhar, K. Experimental study of convection in a model Czochralski crucible using liquid crystal thermography. J Vis 9, 111–119 (2006). https://doi.org/10.1007/BF03181574
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DOI: https://doi.org/10.1007/BF03181574