کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4993841 1458027 2017 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
ReviewHeat transfer of a buoyancy-aided turbulent flow in a trapezoidal annulus
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
ReviewHeat transfer of a buoyancy-aided turbulent flow in a trapezoidal annulus
چکیده انگلیسی


- Buoyancy redistributes flow in sub-channels, 'distorting' heat transfer.
- Buoyancy alters the unsteady large flow structures.
- Buoyancy-induced heat transfer deterioration varies in sub-channels.
- Overall, heat transfer deterioration is weaker in non-uniform channel.

The objective of this paper is to report a numerical investigation into the heat transfer of a buoyancy-aided flow in a rod-bundle-like channel. The flow field is simulated using large eddy simulation (LES) with WALE SGS model and the buoyant force is taken into account using the Boussinesq approximation. The general trend of the effect of buoyancy on the overall heat transfer is similar to that in a pipe flow, but the effect on the regional heat transfer varies greatly. This has resulted from a number of interplaying factors, including, the redistribution of the mass flow in the various sub-channels, the non-uniform buoyancy effects on turbulence in different regions of the domain and the behaviour of the large flow structures in the flow channel. These factors together make the effect of buoyancy on heat transfer in the considered flow channel really complicated, while the last factor has been found to have the most pronounced effect in most cases studied.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 114, November 2017, Pages 211-224
نویسندگان
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