论文标题
矩形管道中分层两相流的不稳定性
Instability of stratified two-phase flows in rectangular ducts
论文作者
论文摘要
研究了分层两相流在矩形管道中的线性稳定性。线性稳定性分析考虑了所有可能的无穷小三维干扰，并通过解决相关本本特征问题解决。对于液体和空气水系统，获得了中性稳定性边界和相应的临界波数。根据问题参数，由于长波最不稳定的扰动，不稳定的设置。报告并讨论了最不稳定的干扰的模式。结果表明，由于剪切或界面机制而引起的不稳定性。还研究了表面张力和宽度/高度纵横比的影响。结果支持这样的前提：在较简单的几何形状中，分层两相流的稳定性分析可以对可以认为该流动模式被认为是线性稳定的条件的合理估计。
The linear stability of stratified two-phase flows in rectangular ducts is studied numerically. The linear stability analysis takes into account all possible infinitesimal three-dimensional disturbances and is carried out by solution of the associated eigenproblem. The neutral stability boundary and the corresponding critical wave number are obtained for liquid - liquid and air - water systems. Depending on the problem parameters, the instability sets in owing to short, intermediate, of long wave most unstable perturbations. Patterns of the most unstable disturbances are reported and discussed. It is shown that the instability arises due to shear, or interfacial mechanisms. Effects of the surface tension and of width/height aspect ratio are also studied. The results support the premise that the stability analysis of stratified two-phase flow in the simpler geometry of two-infinite plates can provide a reasonable estimation of the conditions for which this flow pattern can be considered to be linearly stable.
