Recent experiments have shown that rapid kinematic mixing occurs in the pulmonary alveoli. Here the Reynolds number is very small, there is recirculation in the alveolar cavity and the alveolar walls move periodically. We have recently shown that non-diffusing particles move chaotically in a two-dimensional model flow with the above features. In parts of the lung, however, there is asynchrony between the wall motion and the ductal flow immediately outside the alveolus. The extent to which this asynchrony affects kinematic mixing in real alveoli is not yet known. The purpose of this paper is to describe the effect of asynchrony on chaotic advection in our two-dimensional model, in order to understand the circumstances in which this becomes significant.

最近的实验表明，肺泡中发生了快速的运动混合。这里雷诺数非常小，肺泡腔内有再循环，肺泡壁周期性移动。我们最近表明，非扩散粒子在具有上述特征的二维模型流中混沌移动。然而，在肺的某些部分，壁运动和肺泡外的导管流之间存在不同步。这种不同步影响真实肺泡运动学混合的程度尚不清楚。本文的目的是在我们的二维模型中描述异步对混沌平流的影响，以了解这在什么情况下变得显着。