Dataset underlying the publication: Numerical simulation of jet break-up using the Local Front Reconstruction Method

Primary break-up of liquid jets is often encountered in industrial processes and is scientifically challenging due to its complexity. An accurate description of the break-up length and droplet sizes is critical for controlling the jet dynamics and hence the process performance. Despite the extensive research performed on jet break-up, the existing correlations are not universally applicable to all encountered flow conditions. In this paper, we perform Direct Numerical Simulation of a cylindrical liquid jet using the Local Front Reconstruction Method (LFRM) to track the liquid-gas interface. Experiments are also carried out to validate the simulation results in the same range of Reynolds and Weber numbers. The LFRM method is able to accurately reproduce the experimental break-up lengths and droplet diameters. The surface waves propagating along the jet are compared with the dominant wavelengths reported in literature. It can be concluded that LFRM can accurately describe the dynamics of laminar jets.

液体射流的初始破碎现象广泛存在于工业生产流程中，因其过程复杂而极具科学研究挑战性。精准描述射流破碎长度与液滴尺寸，对于调控射流动力学特性、进而优化工艺性能至关重要。尽管针对射流破碎已开展了大量研究，但现有关联式无法普适适配所有实际流动工况。本文采用局部界面重构法（Local Front Reconstruction Method，LFRM）对圆柱状液体射流开展直接数值模拟（Direct Numerical Simulation），以追踪气液两相界面。同时开展实验研究，在相同的雷诺数（Reynolds number）与韦伯数（Weber number）范围内验证数值模拟结果。该LFRM方法可精准复现实验测得的射流破碎长度与液滴直径。将沿射流传播的表面波与文献报道的主导波长进行对比。综上可证，LFRM可精准描述层流射流的动力学特性。