کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4924327 1430839 2017 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Damping of a fluid-conveying pipe surrounded by a viscous annulus fluid
ترجمه فارسی عنوان
دم کردن یک لوله انتقال مایع، احاطه شده توسط یک مایع حلقه چسبناک است
کلمات کلیدی
برداشت انرژی، دمیدن، لوله انتقال سیالات، تولید هیدروکربن، عملکرد هیدرودینامیکی، مایع حلقه ویسکوز،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
To further the development of a downhole vibration based energy harvester, this study explores how fluid velocity affects damping in a fluid-conveying pipe stemming from a viscous annulus fluid. A linearized equation of motion is formed which employs a hydrodynamic forcing function to model the annulus fluid. The system is solved in the frequency domain through the use of the spectral element method. The three independent variables investigated are the conveyed fluid velocity, the rotational stiffness of the boundary (using elastic springs), and the annulus fluid viscosity. It was found that, due to the hydrodynamic functions frequency-dependence, increasing the conveyed fluid velocity increases the systems damping ratio. It was also noted that stiffer systems saw the damping ratio increase at a slower rate when compared to flexible systems as the conveyed fluid velocity was increased. The results indicate that overestimating the stiffness of a system can lead to underestimated damping ratios and that this error is made worse if the produced fluid velocity or annulus fluid viscosity is underestimated. A numeric example was provided to graphically illustrate these errors. Approved for publication, LA-UR-15-28006.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sound and Vibration - Volume 394, 28 April 2017, Pages 575-592
نویسندگان
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