کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
650795 1457305 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of coaxial cylinders on the vortex breakdown in a closed flow
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Influence of coaxial cylinders on the vortex breakdown in a closed flow
چکیده انگلیسی

The effect of stationary cylindrical rods located at the centerline axis on the vortex breakdown (VB) in a closed flow is studied experimentally and numerically. The flow takes place in a cylindrical container with a rotating end wall. The dimensionless numbers characterizing the dynamics of the system are the Reynolds number, based on the angular velocity of the rotating wall, the aspect ratio of the container and dimensionless radius of the rod. We find that the onset of VB, as a function of the Reynolds number, is anticipated for very small values of the rod radius RrRr, while it is delayed for values of RrRr beyond a critical value. In order to characterize this effect, the critical Reynolds number for the appearance of the vortex breakdown as a function of the radius of the stationary rods and the different aspect ratios was accurately determined, using digital particle image velocimetry and numerically using a three-dimensional Navier–Stokes solver. The numerical and experimental results are compared showing an excellent agreement.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Mechanics - B/Fluids - Volume 29, Issue 3, May–June 2010, Pages 201–207
نویسندگان
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