کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4992333 1457262 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An energy analysis of convective instabilities of the Bödewadt and Ekman boundary layers over rough surfaces
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
An energy analysis of convective instabilities of the Bödewadt and Ekman boundary layers over rough surfaces
چکیده انگلیسی
An energy balance equation for the three-dimensional Bödewadt and Ekman layers of the so called “BEK family” of rotating boundary-layer flows is derived. A Chebyshev discretization method is used to solve the equations and investigate the effect of surface roughness on the physical mechanisms of transition. All roughness types lead to a stabilization of the Type I (cross-flow) instability mode for both flows, with the exception of azimuthally-anisotropic roughness (radial grooves) within the Bödewadt layer which is destabilizing. In the case of the viscous Type II instability mode, the results predict a destabilization effect of radially-anisotropic roughness (concentric grooves) on both flows, whereas both azimuthally-anisotropic roughness and isotropic roughness have a stabilization effect. The results presented here confirm the results of our prior linear stability analyses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Mechanics - B/Fluids - Volume 61, Part 2, January–February 2017, Pages 310-315
نویسندگان
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