کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
672438 887504 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
CFD simulation of smooth and T-abrupt exits in circulating fluidized bed risers
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
CFD simulation of smooth and T-abrupt exits in circulating fluidized bed risers
چکیده انگلیسی
Gas-solid flow in circulating fluidized bed (CFB) risers depends not only on operating conditions but also on exit configurations. Few studies investigated the effects of exit configurations on flow structure using computational fluid dynamics (CFD). This paper provides a 2D two-fluid model to simulate a cold bench-scale square cross-section riser with smooth and T-abrupt exits. The drag force between the gas and solid phases plays an important role in CFD. Since the drag force model based on homogeneous two-phase flow, such as the Wen-Yu correlation, could not capture the heterogeneous structures in gas-solid flow, the structure-dependent energy-minimization multi-scale (EMMS) drag force model (Wang, Ge, & Li, 2008), applicable for Geldart B particles (sand), was integrated into the two-fluid model. The calculated axial solids hold-up profiles were respectively exponential curve for smooth exit and C-shaped curve for T-abrupt exit, both consistent with experimental data. This study once again proves the key role of drag force in CFD simulation and also shows the validity of CFD simulation (two-fluid model) to describe exit effects on gas-solid flow in CFB risers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Particuology - Volume 8, Issue 4, August 2010, Pages 343-350
نویسندگان
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