کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4995579 1458997 2017 35 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Viscous fingering regimes in elasto-visco-plastic fluids
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Viscous fingering regimes in elasto-visco-plastic fluids
چکیده انگلیسی
We experimentally study the Saffman-Taylor instability of air invasion into a non-Newtonian fluid (i.e., Carbopol solution) in a rectangular Hele-Shaw cell. In addition to viscous features, the non-Newtonian fluid used exhibits yield stress, shear-thinning as well as elastic behaviors. The key dimensionless parameters that govern the various flow regimes are the Bingham number (Bn), the capillary number (Ca), the Weber number (We), the Weissenberg number (Wi), the channel aspect ratio (δ ≫ 1), and the shear-thinning power-law index (n). Three main flow regimes are observed, i.e., a yield stress regime, a viscous regime and an elasto-inertial regime. We present a detailed description for each regime and quantify their transition boundaries versus dimensionless groups. Some of the secondary flow aspects, e.g., the wall residual layer thickness and a network structure regime, have been also studied.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 243, May 2017, Pages 79-94
نویسندگان
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