论文标题
轴对称液态流动聚焦的全球稳定性分析
Global stability analysis of axisymmetric liquid-liquid flow focusing
论文作者
论文摘要
我们通过数值和实验分析稳定的喷射尖端流的稳定性，通过将液体流通过轴对称喷嘴的孔口旋转时，通过将另一个液体聚焦为其他液体。我们计算出表征这种构型对小振动扰动的响应的全局本本码。这样，确定导致稳定喷射尖端流的不稳定的临界条件。不稳定的扰动是根据其振荡特征和发源地的区域（对流和绝对不稳定）分类的。我们根据速度场得出并解释一个简单的缩放定律，以预测发射喷射的直径。将数值稳定性限制与实验结果进行比较，发现合理的一致性。该实验证实了通过全球稳定性分析预测的两种不稳定机制的存在。
We analyze both numerically and experimentally the stability of the steady jetting tip streaming produced by focusing a liquid stream with another liquid current when they coflow through the orifice of an axisymmetric nozzle. We calculate the global eigenmodes characterizing the response of this configuration to small-amplitude perturbations. In this way, the critical conditions leading to the instability of the steady jetting tip streaming are determined. The unstable perturbations are classified according to their oscillatory character and to the region where they are originated (convective and absolute instability). We derive and explain in terms of the velocity field a simple scaling law to predict the diameter of the emitted jet. The numerical stability limits are compared with experimental results finding reasonable agreement. The experiments confirm the existence of the two instability mechanisms predicted by the global stability analysis.
