کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
660175 | 1458122 | 2010 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Direct numerical simulation for a time-developing combined-convection boundary layer along a vertical flat plate
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
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چکیده انگلیسی
Time-developing combined-convection boundary layers induced by imposing aiding and opposing flows to the natural-convection boundary layer in air along a hot vertical flat plate have been examined with a direct numerical simulation. As the freestream velocity increases, the transition from laminar to turbulence delays for aiding flow and quickens for opposing flow, corresponding well to actual observations in space-developing flows. The calculated profiles of mean streamwise velocity, mean temperature, intensities of streamwise velocity fluctuation and temperature fluctuation in the laminarization process of the boundary layer for aiding flow agree relatively well with the existing data. Also, the distributions of turbulent statistics and instantaneous fluid motions in the combined-convection boundary layers with adding and opposing flows are displayed, and the regimes of the boundary layer flows obtained from the calculations are compared with those observed in the experiment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 53, Issues 9â10, April 2010, Pages 2113-2122
Journal: International Journal of Heat and Mass Transfer - Volume 53, Issues 9â10, April 2010, Pages 2113-2122
نویسندگان
Mohammad Zoynal Abedin, Toshihiro Tsuji, Yasuo Hattori,