论文标题
在同质各向同性湍流中，碰撞引起的聚集物的破裂，带有粘合剂颗粒
Collision-induced breakage of agglomerates in homogenous isotropic turbulence laden with adhesive particles
论文作者
论文摘要
我们进行直接的数值模拟，并结合粘附的离散元件计算，以研究均匀各向同性湍流中碰撞引起的聚集物的破裂。基于广泛的仿真运行，构建了一个粘附参数ADN，以量化发生，反弹和破裂事件的可能性。然后根据Smoluchowski方程和破裂分数制定碰撞引起的破损率。然后，通过碰撞速度的概率分布和通用传递函数的概率来分析估计的断裂分数，被定义为导致破裂的碰撞的比例。结果表明，随着粘附参数的粘附参数ADN的增加，破裂率是指数降低的，并且尺寸的线性函数增加，而斜率由ADN控制。这些结果允许人们估计任意大小的早期聚集体的破裂率。此外，还检查了流量结构在碰撞引起的破裂中的作用。暴力碰撞和破裂更可能是由于粒子从强烈的涡旋中迅速弹出而发生的，并发生在紧张床单中。我们的结果扩展了剪切诱导的碎片的发现，形成了湍流中聚集物破裂的更完整的图片。
We carry out direct numerical simulation combined with adhesive discrete element calculations to investigate collision-induced breakage of agglomerates in homogeneous isotropic turbulence. Based on extensive simulation runs, an adhesion parameter Adn is constructed to quantify the possibility of occurrence of sticking, rebound, and breakage events. The collision-induced breakage rate is then formulated based on the Smoluchowski equation and a breakage fraction. The breakage fraction, defined as the fraction of collisions that result in breakage, is then analytically estimated by a convolution of the probability distribution of collision velocity and a universal transfer function. It is shown that the breakage rate decreases exponentially as the adhesion parameter Adn increases for doublets and scales as linear functions of the agglomerate size, with the slope controlled by Adn. These results allow one to estimate the breakage rate for early-stage agglomerates of arbitrary size. Moreover, the role of the flow structure on the collision-induced breakage is also examined. Violent collisions and breakages are more likely caused by particles ejected rapidly from strong vortices and happen in straining sheets. Our results extend the findings of shear-induced fragmentation, forming a more complete picture of breakage of agglomerates in turbulent flows.
