کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
237155 465697 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modelling of turbulent gas-particle flows with focus on two-way coupling effects on turbophoresis
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Modelling of turbulent gas-particle flows with focus on two-way coupling effects on turbophoresis
چکیده انگلیسی

An Eulerian model was developed for turbulent gas-particle flow that takes into account the influence of particles on the gas-phase turbulence. For the description of the particle-phase stress the kinetic theory of granular flow and the simpler Hinze model were adopted. A K-ω model was used as the gas phase turbulence model. The difference between one- and two-way coupling was investigated for different particle volume fractions and particle diameters. It was found that particles with a much higher density than the fluid substantially affect the gas-phase in turbulent channel flow for particle volume fractions as low as 10− 4. The models with the particle-phase stress described by the kinetic theory of granular flow and the simpler Hinze model produce similar results for particles with small response times but deviate for larger response times. The study shows that two-way coupling and the turbophoretic effect must be taken into account in models even at relatively low particle volume fractions.

Mean velocity of the gas-phase for four different particle diameters and a simulation without particles. ρp = 910 kg/m3 and Φ0 = 2 ⋅ 10− 4.Figure optionsDownload as PowerPoint slideHighlights
► An Eulerian two-phase flow for turbulent gas-particle flows is developed.
► Gas-particle flow in a vertical channel is simulated.
► Influence of two-way coupling is significant for volume fractions as low as 10−4.
► Particles strongly accumulate near the wall due to turbophoresis.
► Hinze's model for particle fluctuations is accurate only in dilute flows.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Powder Technology - Volume 224, July 2012, Pages 36–45
نویسندگان
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