کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
668454 1458745 2014 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
3D effects in numerical simulations of convective flows in cubical open cavities
ترجمه فارسی عنوان
اثرات سه بعدی در شبیه سازی عددی جریانهای کنسانتره در حفره های باز مکانیکی
کلمات کلیدی
جریان آشفته شبیه سازی عددی سه بعدی، اثرات سه بعدی، سیستم های غیرفعال حرارتی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Buoyancy-driven flows established in open cubical cavities are investigated. Three-dimensional, laminar, transitional and turbulent simulations are obtained, considering both uniform wall temperature and uniform heat flux heating. Aiming the study of 3D effects, results are compared with those previously obtained for 2D situations. To take into account the effects of the variable properties of air, it is assumed that both thermal conductivity and the viscosity depend on temperature, with the density estimated from the state equation. The low-Reynolds k-ω turbulence model is employed to simulate the transitional or fully turbulent flow. The average Nusselt number and the dimensionless mass flow rate have been obtained for Rayleigh numbers ranging 106 ≤ RaH ≤ 1012. The results obtained taking into account variable properties effects are compared with those calculated assuming constant properties and the Boussinesq approximation. In addition, the influence of considering an internal wall (adiabatic or isothermal) is also studied, as well as the influence of the slope of external heated wall.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 77, March 2014, Pages 172-185
نویسندگان
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