کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6591032 | 456868 | 2014 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Applicability of a Taylor-Couette device to characterization of turbulent drag reduction in a pipeline
ترجمه فارسی عنوان
کاربرد یک دستگاه تیلور کویت برای مشخص کردن کاهش کشش آشفته در یک خط لوله
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کلمات کلیدی
دستگاه کویت، کاهش کشیدن، مدل سازی، پلیمر لوله آشفتگی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
A model of turbulent drag reduction in a pipe is developed. The model employs a well-known two layer representation of the boundary layer structure. An approach of Yang and Dou (2010) to model the drag reduction effect, as a phenomenon caused by a non-Newtonian rheology of a viscous sublayer flow, is employed. The modified Prandtl-Karman equation for calculation of the friction factor in a pipe flow of a dilute polymer solution is derived. This equation contains the only empirical parameter that is a function of a polymer type and concentration. The results obtained using the model developed are in a good agreement with those calculated by the Yang and Dou (2010) model, verified against experimental data. An engineering model of a turbulent dilute polymer solution flow in a Couette device is also developed. The same approach to modeling drag reduction as that in a pipe flow is applied. The model allows to compute the dimensionless torque applied to the Couette device rotor as a function of the rotation speed for a given polymer type and concentration. Thus, the empirical parameter, characterizing drag reduction by using a certain polymer additive, can be identified from laboratory Couette device experiments requiring small fluid amounts, and then applied to forecast drag reduction in industrial-scale pipeline flows.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 116, 6 September 2014, Pages 275-283
Journal: Chemical Engineering Science - Volume 116, 6 September 2014, Pages 275-283
نویسندگان
Dmitry Eskin,