论文标题
部分可观测时空混沌系统的无模型预测
Bag breakup of low viscosity drops in the presence of a continuous air jet
论文作者
论文摘要
这项工作检查了在存在连续水平空气射流的情况下变形的各种低粘度流体的单滴分解。这种碎裂通常发生在大体液体在退出雾化器时瓦解后瓦解并以滴剂的形式崩解，以进一步破裂。下降变形及其最终瓦解对于评估特定工业过程的功效，无论是在汽车发动机中的燃烧还是在农业应用中喷洒农药。表面张力的竞争影响与空气动力的破坏力之间的相互作用由Weber Number，$ We $和Ohnesorge编号（$ OH $）表示，并用于描述分手形态。我们的研究中考虑的分解模式对应于带有环形环上的袋子的袋子，该袋子的出现在$ 12 <We <16 $中。我们的目标是解决与此分手过程有关的几个问题，以及它们对$ $ $ $ $ $ $的依赖，这些问题迄今尚未探索。理论上确定了分手开始的$ we $界限，并且获得的表达式$ we = 12（1 + 2/3OH^2）$，与文献中可用的实验数据非常匹配。袋子的径向范围内的指数生长和袋子的流线维度由理论模型预测，并通过实验发现证实。观察到这些数量在很大程度上取决于$ WE $。但是，他们对$ OH $的依赖很弱。
This work examines the breakup of a single drop of various low viscosity fluids as it deforms in the presence of continuous horizontal air jet. Such a fragmentation typically occurs after the bulk liquid has disintegrated upon exiting the atomizer and is in the form of an ensemble of drops which undergo further breakup. The drop deformation and its eventual disintegration is important in evaluating the efficacy of a particular industrial process, be it combustion in automobile engines or pesticide spraying in agricultural applications. The interplay between competing influences of surface tension and aerodynamic disruptive forces is represented by the Weber number, $We$, and Ohnesorge number, $Oh$, and used to describe the breakup morphology. The breakup pattern considered in our study corresponds to that of a bag attached to a toroidal ring which occurs from $12 < We < 16$. We aim to address several issues connected with this breakup process and their dependence on $We$ and $Oh$ which have been hitherto unexplored. The $We$ boundary at which breakup begins is theoretically determined and the expression obtained, $We = 12(1 + 2/3Oh^2)$, is found to match well with experimental data available in literature. An exponential growth in the radial extent of the deformed drop and the streamline dimension of the bag is predicted by a theoretical model and confirmed by experimental findings. These quantities are observed to strongly depend on $We$. However, their dependence on $Oh$ is weak.
