The effect of turbulence on mass transfer rates between inertial polydisperse particles and fluid

被引:13
作者
Karchniwy, Ewa [1 ,3 ]
Klimanek, Adam [3 ]
Haugen, Nils Erland L. [1 ,2 ]
机构
[1] Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, Kolbjorn Hejes Vei 1B, N-7491 Trondheim, Norway
[2] SINTEF Energi AS, Sem Saelands Vei 11, N-7034 Trondheim, Norway
[3] Silesian Tech Univ, Inst Thermal Technol, Konarskiego 22, PL-44100 Gliwice, Poland
关键词
combustion; reacting multiphase flows; turbulent reacting flows; DIRECT NUMERICAL-SIMULATION; PULVERIZED COAL COMBUSTION; JET FLAME; CLUSTERS; IGNITION; MODEL;
D O I
10.1017/jfm.2019.493
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The current work investigates how turbulence affects the mass transfer rate between inertial particles and fluid in a dilute, polydisperse particle system. Direct numerical simulations are performed in which all scales of turbulence are fully resolved and particles are represented in a Lagrangian reference frame. The results show that, similarly to a monodisperse system, the mass transfer rate between particles and fluid decreases as a result of particle clustering. This occurs when the flow time scale (based on the turbulence integral scale) is long relative to the chemical time scale, and is strongest when the particle time scale is one order of magnitude smaller than the flow time scale (i.e. the Stokes number is around 0.1). It is also found that for larger solid mass fractions, the clustering of the heavier particles is enhanced by the effect of drag force from the particles on the fluid (momentum back-reactions or two-way coupling). In particular, when two-way coupling is accounted for, locations of particles of different sizes are much more correlated, which leads to a stronger effect of clustering, and thus a greater reduction of the particle-fluid mass transfer rate.
引用
收藏
页码:1147 / 1168
页数:22
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