在无阻碍的肥皂膜流中的Marangoni激波
Marangoni shocks in unobstructed soap-film flows
摘要：
人们普遍认为，在稳定的、重力驱动的、无阻碍的皂膜流中，速度在下游单调增加。在这里，我们表明实验速度增加，峰值，突然下降，然后逐渐减少下游。我们认为，理论和实验验证，速度的突然下降对应于马兰戈尼冲击，一种类型的冲击有关的弹性的电影。马兰戈尼冲击引起局部强烈的湍流波动，并可能有助于阐明产生二维湍流远离边界的机制。
英文摘要：
It is widely thought that in steady, gravity-driven, unobstructed soap-film flows, the velocity increases monotonically downstream. Here we show experimentally that the velocity increases, peaks, drops abruptly, then lessens gradually downstream. We argue theoretically and verify experimentally that the abrupt drop in velocity corresponds to a Marangoni shock, a type of shock related to the elasticity of the film. Marangoni shocks induce locally intense turbulent fluctuations and may help elucidate the mechanisms that produce two-dimensional turbulence away from boundaries.
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