کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4993015 1457472 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Double-diffusive laminar free convection in a porous cavity simulated with the two-energy equation model
ترجمه فارسی عنوان
جابه جایی آزاد بدون لایه دوگانه در یک حفره متخلخل با مدل معادلات دو انرژی شبیه سازی شده است
کلمات کلیدی
مدل غیر تعادل حرارتی، رسانه های متخلخل، دو نفره، پودر طبیعی جریان آرام،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Numerical simulations for laminar double-diffusive free convection in a porous square cavity using the Thermal Non-Equilibrium Model were presented. Vertical surfaces were maintained at constant temperature and concentration whereas horizontal walls were kept insulated. The cavity was filled with a rigid and isotropic porous matrix, which was saturated with an incompressible fluid. Transport equations were discretized by means of the control volume method leading to a coupled algebraic equation set that was solved via the SIMPLE method. Results pointed that both Nuw and Shw are dependent on porosity ϕ and on the thermal conductivity ratio ks/kf. Nuw decreases as ϕ decreases or ks/kf increases due to enhancement of conduction transport across the cavity. On the other hand, Shw and wall mass flux increases as porosity decreases or ks/kf increases. Such dependence of Shw arises from the intensification of recirculating motion in the cavity as ϕ is reduced or ks/kf is of a higher value, which affects heat exchange between phases and, consequently, wall mass fluxes. Finally, this study shows that both average Nusselt and Sherwood numbers diverge from published correlation when ks/kf > 1 for same Da value.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Communications in Heat and Mass Transfer - Volume 82, March 2017, Pages 89-96
نویسندگان
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