کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7052702 | 1457457 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
An experimental study of a starting plume on a mountain
ترجمه فارسی عنوان
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کلمات کلیدی
شروع سیل، مدل کوه، مخزن آب، تعداد رایلی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Transient natural convection is commonly present on a mountain owing to sun radiation. In this study, a starting plume rising from the mountain is experimentally investigated. Shadowgraph technology is employed to visualize transient natural convection flows on a heated copper mountain model in a water tank for a range of Rayleigh numbers from Raâ¯=â¯7.2â¯Ãâ¯106 to 6.44â¯Ãâ¯107. Transient flows on the mountain model can be characterized by a thermal boundary layer in the conduction stage and by the starting plume in the transition to a quasi-steady state. A very simple scaling analysis is used to discuss the dynamics of transient natural convection flows on the mountain model. The scaling relations of the thickness and the velocity of the thermal boundary layer and the starting plume on the mountain are obtained, some of which, for example, the velocity of the starting plume in the head velocity increase stage, vPâ¯~â¯Îº2tRa/h3(1â¯+â¯Aâ2)1/3, are validated by the experimental data. Additionally, the breaking of the plume head is described and quantified, and the flapping of the plume stem is also discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Communications in Heat and Mass Transfer - Volume 97, October 2018, Pages 1-8
Journal: International Communications in Heat and Mass Transfer - Volume 97, October 2018, Pages 1-8
نویسندگان
Xingyu Wang, Feng Xu, Haoyu Zhai,