کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4994083 1458030 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Three-phase computation of solidification in an open horizontal circular cylinder
ترجمه فارسی عنوان
محاسبه سه فاز جامد در سیلندر افقی دایره ای باز
کلمات کلیدی
ردیابی جبهه شبیه سازی سه فاز، تعامل، جامد سازی، سیلندر افقی را باز کنید
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
We present numerical simulations of solidification in an open vertical circular cylinder with the presence of a gas phase and natural convection. The numerical technique used is a two-dimensional front-tracking method combined with an interpolation method. A simple tri-junction condition, in terms of the growth angle ϕgr, is included due to the presence of three phases. Effects of various dimensionless parameters such as the Prandtl number Pr, the Stefan number St, the Rayleigh number Ra, the Weber number We, the dimensionless initial temperature θ0, the density ratio of the solid to liquid phases ρsl and the thermal expansion coefficient ratio of the gas to liquid phases βgl are investigated. Numerical results show that, the shape of the solidified phase is strongly affected by ρsl and ϕgr. Volume expansion (ρsl < 1.0) produces a “cone-like” top surface while shrinkage (ρsl > 1.0) forms a cavity at the center of the cylinder. An increase in ϕgr in the range of 0-15° results in an increase in the slope of the top solid interface near the center. Decreasing St in the range of 1.0-0.01, with the presence of volume expansion, results in a steeper solid interface near the center. Without volume change (ρsl = 1.0), the top surface of the solidified phase becomes more curved with an increase in Pr in the range of 0.01-10, Ra in the range of 103-5 × 105, or We in the range of 10−5-4 × 10−3. In contrast, varying θ0 (in the range of 1.0-2.5) or βgl (in the range of 5 × 10−4-5 × 10−1) has a very minor effect on the top surface. In addition, the effects of these parameters on the evolution of the solidification front are also investigated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 111, August 2017, Pages 398-409
نویسندگان
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