کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4994914 1458481 2017 39 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characteristics of stratified flows of Newtonian/non-Newtonian shear-thinning fluids
ترجمه فارسی عنوان
خصوصیات جریان های طبقه بندی شده از مایعات برشی نیوتنی / غیر نیوتنی
کلمات کلیدی
جریان تقسیم شده، مایع برش باریک، نگه داشتن راه حل های چندگانه، عوامل شکل، دو مدل مایع،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Exact solutions for laminar stratified flows of Newtonian/non-Newtonian shear-thinning fluids in horizontal and inclined channels are presented. An iterative algorithm is proposed to compute the laminar solution for the general case of a Carreau non-Newtonian fluid. The exact solution is used to study the effect of the rheology of the shear-thinning liquid on two-phase flow characteristics considering both gas/liquid and liquid/liquid systems. Concurrent and counter-current inclined systems are investigated, including the mapping of multiple solution boundaries. Aspects relevant to practical applications are discussed, such as the insitu hold-up, or lubrication effects achieved by adding a less viscous phase. A characteristic of this family of systems is that, even if the liquid has a complex rheology (Carreau fluid), the two-phase stratified flow can behave like the liquid is Newtonian for a wide range of operational conditions. The capability of the two-fluid model to yield satisfactory predictions in the presence of shear-thinning liquids is tested, and an algorithm is proposed to a priori predict if the Newtonian (zero shear rate viscosity) behaviour arises for a given operational conditions in order to avoid large errors in the predictions of flow characteristics when the power-law is considered for modelling the shear-thinning behaviour. Two-fluid model closures implied by the exact solution and the effect of a turbulent gas layer are also addressed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Multiphase Flow - Volume 97, December 2017, Pages 109-133
نویسندگان
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