کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
235627 465643 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Momentum transport between two granular phases of spherical particles with large size ratio: Two-fluid model versus discrete element method
ترجمه فارسی عنوان
انتقال مماس بین دو مرحله دانه ذرات کروی با نسبت اندازه بزرگ: مدل دو مایع در مقایسه با روش عنصر گسسته
کلمات کلیدی
جریان چند مرحله ای جامد گاز، کشیدن جامد جامد، مدل یولر دو موتوره، روش عنصر گسسته
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Solid–solid drag is studied when the size ratio is 10 in bidisperse mixtures.
• Discrete element method (DEM) is employed versus two-fluid Eulerian model.
• Results of Eulerian model significantly differ from DEM for large size ratio.

Two-fluid Eulerian method is widely used in computer simulations of gas–solid systems such as fluidized beds. The models for describing drag forces play key roles in the reliability of simulation results. The solid–solid drag model is calculated by the formulas such as Syamlal-O'Brian's model [Syamlal, M. The particle–particle drag term in a multiparticle model of fluidization. Topical report, DOE/MC/21353-2373, NTIS/DE87006500, National Technical Information Service, Springfield, VA. 1987]. However, the performance of the model has not been examined in the mixtures of solid phases with a large size ratio between the particles of the phases, which is found in fluidized beds containing biomass particles (big particles) and the neutral phase particles (small particles) such as sand. The present study compares the results of Eulerian simulations using the Syamlal-O'Brian's formula with the results of Lagrangian simulations performed by the discrete element method (DEM) in the bidisperse mixtures of the size ratio of 10. Results suggest a significant difference between the Eulerian model and the DEM, which is basically due to the inhomogeneities triggered by the existence of large particles. The current methodology can be used to present correction factors for the solid–solid drag forces in Eulerian simulations for the bidisperse mixtures of large size ratios.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Powder Technology - Volume 273, March 2015, Pages 13–18
نویسندگان
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