Numerical investigation of effect of electrostatic forces on the hydrodynamics of gas–solid fluidized beds
Numerical investigation of effect of electrostatic forces on the hydrodynamics of gas–solid fluidized beds
复制标题
DOI：
10.1016/j.powtec.2013.05.007
复制
发表时间：
2013-09
影响因子：
5.2
通讯作者：
M. Hassani;R. Zarghami;H. Norouzi;N. Mostoufi
中科院分区：
文献类型：
--
作者：
M. Hassani;R. Zarghami;H. Norouzi;N. Mostoufi
采用三维离散元法（DEM）和计算流体力学（CFD）耦合模型，研究了颗粒间静电力对流化流体力学的影响。为了验证这一代码，气泡直径在单气泡注射和自由起泡制度进行了比较与实验值和可接受的协议观察。模拟结果表明，随着单荷电颗粒进入床层的荷电量的增加，气泡尺寸减小，固体扩散系数减小，孔隙率和颗粒循环量的分布也发生变化，床层趋于均匀。在床层中加入双极性荷电颗粒后，气泡尺寸、固体扩散系数和空隙率分布接近中性床层，颗粒趋于形成颗粒连接链。
A 3D discrete element method (DEM) coupled with computational fluid dynamics (CFD) model was developed for studying the effect of electrostatic forces between particles on fluidization hydrodynamics. To validate this code, bubble diameters in the single bubble injection and freely bubbling regimes were compared with experimental values and acceptable agreement was observed. The simulation results showed that by increasing the charge of mono-charged particles into the bed, the bubble size and solid diffusion coefficient decrease and distribution of porosity and particles circulation also change and bed tends toward more homogeneity. By adding bipolar charged particles into the bed, bubble size, solids diffusivity and voidage distribution approach to that of the neutral bed and particles tend to form chains of connected particles.