27 مهر 1398
ابراهيم محمدي منش

ابراهیم محمدی منش

مرتبه علمی: استادیار
نشانی: ملایر- کیلومتر 5 جاده اراک- پردیس دانشگاه ملایر- دانشکده علوم- گروه فیزیک
تحصیلات: دکترای تخصصی / فیزیک حالت جامد
تلفن: 081-32355404
دانشکده: علوم پایه

مشخصات پژوهش

عنوان
COMPUTATIONAL FLUID DYNAMICS AND HEAT TRANSFER IN CZOCHRALSKI GROWTH OF SAPPHIRE CRYSTAL
نوع پژوهش مقاله ارائه شده
کلیدواژه‌ها
Computer simulation, Heat transfer, Fluid flow, Czochralski method.
سال
2010
پژوهشگران ابراهیم محمدی منش

چکیده

The goal of the research presented here is to apply a global analysis of an inductively heated Czochralski furnace for a real sapphire crystal growth system and predict the characteristics of the temperature and flow fields in the system. To do it, for the beginning stage of a sapphire growth process, influence of melt and gas convection combined with radiative heat transfer on the temperature field of the system and the crystal-melt interface have been studied numerically using the steady state two-dimensional finite element method. For radiative heat transfer, internal radiation through the grown crystal and surface to surface radiation for the exposed surfaces have been taken into account. The numerical results demonstrate that there are a powerful vortex which arises from the natural convection in the melt and a strong and large vortex that flows upwards along the afterheater side wall and downwards along the seed and crystal sides in the gas part. In addition, a wavy shape has been observed for the crystal-melt interface with a deflection towards the melt.