کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4995232 | 1458702 | 2017 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of enclosure geometry and thermal boundary condition on Rayleigh-Bénard convection of cold water near its maximum density
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of enclosure geometry and thermal boundary condition on Rayleigh-Bénard convection of cold water near its maximum density Effects of enclosure geometry and thermal boundary condition on Rayleigh-Bénard convection of cold water near its maximum density](/preview/png/4995232.png)
چکیده انگلیسی
A series of three-dimensional numerical simulations on Rayleigh-Bénard convection of cold water with the density inversion phenomenon in different enclosed containers with two thermal boundary conditions on the sidewalls are performed by using the finite volume method. Rayleigh number ranges from 2Â ÃÂ 103 to 3Â ÃÂ 105. The effects of density inversion parameter, aspect ratio, geometrical shape of the enclosure and thermal boundary conditions are discussed in detail. Results indicate that the density inversion phenomenon and the aspect ratio have a significant influence on the flow pattern and heat transfer. At a large Rayleigh number, the period oscillatory R-B flow is observed in the rectangular container with conducting sidewalls. However, the unsteady R-B flow in the cylindrical container with insulating sidewalls behaves as the single period, multi-period and chaotic flow characteristics with the increase of Rayleigh number. The heat transfer ability is enhanced by increasing Rayleigh number and the aspect ratio, while it's weakened with the increase of the density inversion parameter. The average Nusselt number of Rayleigh-Bénard convection of cold water in the rectangular container is larger than that in the cylindrical container, but nearly the same for the insulating and conducting sidewalls.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 120, October 2017, Pages 220-232
Journal: International Journal of Thermal Sciences - Volume 120, October 2017, Pages 220-232
نویسندگان
Yu-Peng Hu, You-Rong Li, Ming-Hai Li, Li Zhang, Si-Zhong Li,