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首页> 外文期刊>International Journal of Multiphase Flow >Effect of feedback and inter-particle collisions in an idealized gas-liquid annular flow
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Effect of feedback and inter-particle collisions in an idealized gas-liquid annular flow

机译：理想气液环流中反馈和粒子间碰撞的影响

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An idealized gas-liquid annular flow in a vertical rectangular channel was considered. Point sources of solid spheres were located on the walls to represent an atomizing wall film. The decrease in the deposition coefficient with increasing volume fraction, observed in laboratory studies, was examined by using a direct numerical simulation, which does not fully resolve scales of the size of particles, to calculate the fluid turbulence. The influence of particles on the fluid turbulence was modeled simply by introducing point forces at particle loci. Inter-particle collisions were also considered. Significant attenuation of fluid turbulence at very low concentrations could be observed as resulting from the feedback effect of particles. In the fluid momentum balance the fluid Reynolds shear stresses decrease with increasing the volume fraction in order to accommodate the particle forces. This leads to a decrease in the production of fluid turbulence and, therefore, to a decrease in particle turbulence. Particle turbulence is augmented by elastic inter-particle collisions and can be attenuated by inelastic inter-particle collisions. The decrease in the deposition coefficient, observed in gas-liquid annular flows, can be explained by the feedback effect if droplet collisions are highly inelastic. When feedback and elastic inter-particle collisions are considered, changes in the particle turbulence are mainly associated with elastic inter-particle collisions at large enough volume fractions.
机译：考虑了垂直矩形通道中的理想气液环形流。固体球体的点源位于墙壁上，代表雾化的壁膜。在实验室研究中观察到，沉积系数随体积分数的增加而降低，是通过使用直接数值模拟来检查的，该数值模拟无法完全解析颗粒尺寸的尺度，从而计算出流体湍流。粒子对流体湍流的影响可以简单地通过在粒子位点处引入点力来建模。还考虑了粒子间碰撞。由于颗粒的反馈作用，在非常低的浓度下可以观察到流体湍流的显着衰减。在流体动量平衡中，流体雷诺剪切应力随着体积分数的增加而减小，以适应颗粒力。这导致流体湍流产生的减少，因此导致颗粒湍流的减少。弹性的粒子间碰撞会增加粒子的湍流，而非弹性的粒子间碰撞会削弱粒子的湍流。如果液滴碰撞是高度非弹性的，则可以通过反馈效应来解释在气液环形流中观察到的沉积系数的降低。当考虑反馈和弹性粒子间碰撞时，粒子湍流的变化主要与体积分数足够大时的弹性粒子间碰撞有关。

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