Spinning disk atomization: Theory of the ligament regime
Spinning disk atomization: Theory of the ligament regime
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DOI：
10.1063/1.5044429
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发表时间：
2018-09-01
影响因子：
4.6
通讯作者：
Shikhmurzaev, Yulii D.
中科院分区：
文献类型：
--
作者：
Li, Yuan;Sisoev, Grigori M.;Shikhmurzaev, Yulii D.
建立了旋转圆盘雾化过程的整体数学模型，即从旋转圆盘上的油膜流动到从圆盘边缘螺旋伸出的韧带末端的液滴形成和脱离，并描述了其实现的关键结果。旋转圆盘雾化技术是最有效的无喷嘴雾化技术之一，在冶金、制药等领域有着广泛的应用，但目前其设计和优化仍停留在经验阶段，既费时又费钱。在本工作中，整个旋转圆盘雾化过程首次通过以下方式进行数学建模：(A)利用关于其元素的所有已知分析结果，特别是圆盘上的油膜流动和出射螺旋射流的动力学，其中流动描述可以被渐近简化；(B)使用将这些元素聚集在圆盘边缘附近的过渡区中的三维非定常自由边界流动的全尺度数值模拟。模拟结果揭示了旋转圆盘雾化过程中一些以前未曾报道过的定性特征，如传出韧带相对于圆盘的漂移，并阐明了物理因素对液滴尺寸分布的影响，在这种情况下，卫星液滴也是如此。将所得结果与已有的实验数据进行了比较，证实了模型中所用假设的有效性。由AIP出版公司出版。
A method of the mathematical modeling of the spinning disk atomization process as a whole, from the film flow on a rotating disk to the drop formation and detachment from the ends of the ligaments spiralling out of the disk's rim, is formulated and the key results illustrating its implementation are described. Being one of the most efficient nozzle-free atomization techniques, spinning disk atomization is used in many applications, ranging from metallurgy to pharmaceutical industry, but until now its design and optimization remain empirical which is time consuming and costly. In the present work, the entire spinning disk atomization process is, for the first time, modelled mathematically by (a) utilizing all known analytic results regarding its elements, notably the film flow on the disk and the dynamics of outgoing spiral jets, where the flow description can be simplified asymptotically and (b) using the full-scale numerical simulation of the three-dimensional unsteady free-boundary flow in the transition zone near the disk's rim which brings these elements together. The results illustrating the developed modeling approach reveal some previously unreported qualitative features of the spinning disk atomization process, such as the drift of the outgoing ligaments with respect to the disk, and elucidate the influence of physical factors on the size distribution of the drops and, where this is the case, satellite droplets. The comparison of the obtained results with available experimental data confirms the validity of the assumptions used in the modeling. Published by AIP Publishing.