کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7055311 1458039 2016 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Taylor flow in intermediate diameter channels: Simulation and hydrodynamic models
ترجمه فارسی عنوان
جریان تیلور در کانال های قطر متوسط: مدل های شبیه سازی و هیدرودینامیکی
کلمات کلیدی
جریان تیلور، حجم مایع جریان دو مرحله ای، پمپ حباب،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The two-phase Taylor flow pattern has been studied extensively. However, limited information is available for flows in intermediate diameter channels (5≲Bo≲40, or 6mm≲D≲27mm for ambient gas-water flows), as found in air-lift and bubble pumps. Previous investigations have primarily evaluated Taylor flow models in terms of overall pressure drop, which incorporates hydrostatic and multiple hydrodynamic components. Thus, individual sub-models and sources of error could not be directly assessed. In this investigation, volume-of-fluid (VOF) based Taylor flow simulations are performed over a wide range of laminar and turbulent conditions in the intermediate Bond number regime (5 < Bo < 20, 250 < Nf < 1000, and 20 < Rej < 8100). Results are applied to individually evaluate hydrodynamic sub-models for bubble-region frictional pressure drop gradient (∇pf,b), slug frictional pressure drop gradient (∇pf,s), and flow transition pressure loss (Δptrans). Based on these results, recommendations are provided for selection of hydrodynamic sub-models. These hydrodynamic closure models are integrated with kinematic flow models to yield a complete intermediate Bond number Taylor flow formulation for which all submodels were independently validated. The resulting model achieves improved accuracy for predicting experimental liquid flow rates compared with previous Taylor flow models (81% of cases within 50% of measured flows rates).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 103, December 2016, Pages 1108-1124
نویسندگان
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