叶片宽度比对同心双螺旋静态混合器混合性能的影响

同心双螺旋静态混合器是一种新型的静态混合装置，能够实现流体在混合管内的同心反向螺旋流动。为探究同心双螺旋元件内外叶片宽度比对混合效果的影响规律，利用Fluent中多相流混合模型对低雷诺数状态下该混合器内的混合过程进行了数值模拟，研究结果表明：在较低雷诺数下，同心双螺旋静态混合器与对应尺寸的传统Kenics型混合器相比混合效果明显提升，在叶片宽度比e为0~3/2时混合效果提升6.9%~28%；随着内外叶片宽度比的增大，混合效果呈现先增后减的规律，当e=2/3时混合效果最好；在不同的宽度比下，流体的分离强度沿混合管轴向变化规律相同，即在第一个混合元件内分离强度下降缓慢，第二、三个元件内下降迅速，第四个元件内几乎保持不变而处于维持混合状态，说明本文所研究的混合器使用较少的混合元件即可达到较好的混合效果。

Effect of twisted elements aspects ratio on the mixing performance of a concentric double helix static mixer

A concentric double-spiral static mixer is a new type of static mixing device, which can realize concentric reverse spiral flow of fluids in a mixing tube. Fluent software was used to explore the influence of the ratio of the widths of the inner and outer blades of the concentric double-spiral element on the mixing effect. The multi-phase-flow mixing model was used to numerically simulate the mixing process in the mixer under low Reynolds number conditions. The results show that the concentric double-spiral static mixer has a significantly improved mixing effect compared with a traditional Kenics type mixer of a comparable size, with the mixing effect increasing by 6.9%-28%, when e, the ratio of blade widths, was varied from 0 to 3/2. With increasing width ratio of the inner and outer blades, the mixing effect initially increases and then decreases, and the mixing effect is the best when e=2/3. For different width ratios, the separation strength of the fluid changes along the axial direction of the mixing tube. The separation strength decreases slowly in the first mixing element, but decreases rapidly in the second and third elements, and remains almost unchanged in the fourth element and maintains a mixing state. The results indicate that, compared with the conventional mixer, the mixer studied in this paper can achieve better mixing results with fewer mixing components.