Mixing is an inseparable part of many industries. Static mixers are motionless inserts that are widely used for mixing. In this study, planar laser-induced fluorescence (PLIF) was used to study the mixing characteristics of a multilayer static mixer. The effects of the arrangement angle of layer elements of the static mixer were examined. Arrangement angles of 0°, 45°, and 90° were investigated at four different flow-rate ratios of two mixing fluids. The mixing performance of each angle was evaluated with both qualitative and quantitative approaches. The volume fractions of the flows were obtained from the PLIF results, and the mixing index was calculated. The friction factor was measured to assess the pressure loss of each arrangement angle. The results show that the arrangement angles do not affect the mixing index for higher flow ratios. However, at the lowest flow ratio, the angle of 45° resulted in the highest mixing index of 74.9%, while at 0° and 90°, the values reached 66.4% and 69.8%, respectively. In regard to pressure loss, 45° also resulted in the lowest friction factor.

Graphic abstract

中文翻译：

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平面激光诱导荧光定量观察多层静态混合器的混合特性

混合是许多行业不可分割的一部分。静态混合器是静止混合器，广泛用于混合。在这项研究中，使用平面激光诱导荧光（PLIF）来研究多层静态混合器的混合特性。检查了静态混合器的层元件的布置角度的影响。在两种混合流体的四种不同流量比下，研究了0°，45°和90°的布置角度。使用定性和定量方法评估每个角度的混合性能。从PLIF结果获得流量的体积分数，并计算混合指数。测量摩擦系数以评估每个布置角度的压力损失。结果表明，对于较高的流量比，布置角度不会影响混合指数。但是，在最低的流量比下，45°的角度导致最高混合指数为74.9％，而在0°和90°时，混合指数分别达到66.4％和69.8％。关于压力损失，45°也导致最低的摩擦系数。

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