کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
658755 1458089 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of rotating cylinder on heat transfer in a square enclosure filled with nanofluids
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Effect of rotating cylinder on heat transfer in a square enclosure filled with nanofluids
چکیده انگلیسی
Convective heat transfer in a differentially heated square enclosure with an inner rotating cylinder is studied theoretically. The free space between the cylinder and the enclosure walls is filled with water-Ag, water-Cu, water-Al2O3 or water-TiO2 nanofluids. The governing equations are formulated for velocity, pressure and temperature formulation and are modeled in COMSOL, a partial differential equation (PDE) solver based on the Galerkin finite element method (GFEM). The governing parameters considered are the solid volume fraction, 0.0 ⩽ ϕ ⩽ 0.05, the cylinder radius, 0 ⩽ R ⩽ 0.3 and the angular rotational velocity, −1000 ⩽ Ω ⩽ 1000. The results are presented to show the effect of these parameters on the heat transfer and fluid flow characteristics. It is found that the strength of the flow circulation is much stronger for a higher nanoparticle concentration, a better thermal conductivity value and a smaller cylinder with a faster, negative rotation. The maximum heat transfer are obtained at a high nanoparticle concentration with a good conductivity value, a slow positive rotation and a moderate cylinder size located in the center of the enclosure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 55, Issues 23–24, November 2012, Pages 7247-7256
نویسندگان
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