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A bubble-based EMMS model for pressurized fluidization and its validation with data from a jetting fluidized bed

机译：基于气泡的EMMS模型用于加压流化并通过喷射流化床数据进行验证

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摘要

A bubble-based EMMS model for a Pressurized Fluidized Bed (PFB) was revised on the basis of an energy minimization multi-scale (EMMS) method. In the new revised model, in order to calculate the heterogeneous index accounting for the hydrodynamic disparity between heterogeneous and homogeneous fluidization, a bubble size correlation derived from experiments on a pressurized jetting fluidized bed with a conical distributor was introduced. With given operating pressure and gas superficial velocity, a heterogeneous index was calculated by integrating the bubble size correlation under elevated pressure with the EMMS model. The heterogeneous index, which decreased with the height above the distributor and also had its lowest lever when the mean voidage is in the range of (epsilon(mf), 1.0), was fitted into a surface and incorporated into Fluent as a user-defined function (UDF). The new bubble-based EMMS/PFB drag model was validated by predicting successfully the solid concentration distribution, the velocity of particles near the wall above the distributor, the radial profiles of particles' vertical motion and the average bubble size.
机译：在最小化多尺度能量（EMMS）方法的基础上，修改了用于加压流化床（PFB）的基于气泡​​的EMMS模型。在新的修订模型中，为了计算考虑到非均质流化和均质流化之间流体动力学差异的非均质指数，引入了采用锥形分配器的加压喷射流化床实验得出的气泡尺寸相关性。在给定的工作压力和气体表观速度的情况下，通过将高压下的气泡尺寸相关性与EMMS模型进行积分来计算非均质指标。当平均空隙度在（epsilon（mf），1.0）范围内时，异质指数会随着分布器上方的高度而降低，并且具有最低的杠杆，该异质指数被安装到一个表面中，并根据用户定义并入Fluent中功能（UDF）。通过成功预测固体浓度分布，分布器上方壁附近的粒子速度，粒子垂直运动的径向轮廓和平均气泡大小，验证了基于气泡的新EMMS / PFB阻力模型。

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