Capillary phenomena and disintegration processes of a square cylindrical liquid column
Capillary phenomena and disintegration processes of a square cylindrical liquid column
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DOI：
10.1016/j.ijheatmasstransfer.2010.06.048
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发表时间：
2010-11
影响因子：
5.2
通讯作者：
Mohammad Ali;A. Umemura
中科院分区：
文献类型：
--
作者：
Mohammad Ali;A. Umemura
本文对方柱液柱在松弛和崩解过程中的动力学行为进行了数值研究。基于VOF方法编制了一个计算机程序，用于揭示该过程的内观现象。在应用于本研究之前，通过将模拟结果与实验数据进行比较，对程序进行了验证。结果表明，模拟结果与实验结果吻合较好，并决定将该程序用于研究液柱的松弛、崩解和毛细不稳定性。在本研究中，数值说明了液体圆柱的松弛，毛细管波的形成，其传播和液体柱的解体过程中的基本物理。对雾化过程的研究表明，与传统的射流雾化理论预测的结果有很大的差别。可以观察到，毛细管波的形成是由表面张力引发的尖锐边缘上的方形端的圆柱和波的传播发生由于表面张力力的作用对流体的运动。研究表明，在液体分解之前，毛细波变得不稳定，这种不稳定性的来源是由系统固有地发展的。
A numerical study has been performed to investigate some general features of the time-dependent dynamics of a square cylindrical liquid column during its relaxation and disintegration processes. A computer code based on VOF method has been developed to reveal the insight phenomena of the processes. Before using for present investigation, the code is validated by comparing the simulation result with the experimental data. It is found that the simulation result agrees well with the experiment and decided to use this code for the investigation of relaxation, disintegration and capillary instability of the liquid column. In present investigation the numeric illustrates the underlying physics during relaxation of the liquid cylinder, formation of capillary wave, its propagation and disintegration of liquid column. The investigation on the disintegration processes shows some significant differences from those predicted by conventional jet atomization theories. It can be observed that the formation of capillary wave is initiated by the surface tension on the sharp edge of the square end of the cylinder and the propagation of the wave occurs due to the effect of surface tension force on the motion of the fluid. The investigation reveals that before disintegration of the liquid, the capillary waves become unstable and the source of this instability is inherently developed by the system.