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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Dynamics of a radially expanding liquid sheet: Experiments
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Dynamics of a radially expanding liquid sheet: Experiments

机译：APS-APS流体动力学分部第70届年会-事件-径向膨胀液体片的动力学：实验

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A recent theory predicts that sinuous waves generated at the center of a radiallyexpanding liquid sheet grow spatially even in absence of a surrounding gas phase.Unlike flat liquid sheets, the thickness of a radially expanding liquid sheet variesinversely with distance from the center of the sheet. To test the predictions of thetheory, experiments were carried out on a horizontal, radially expanding liquidsheet formed by collision of a single jet on a solid impactor. The latter was placedon a speaker-vibrator with controlled amplitude and frequency. The growth of sinuouswaves was determined by measuring the wave surface inclination angle using reflectedlaser light under both atmospheric and sub-atmospheric pressure conditions. It isshown that the measured growth rate matches with the predictions of the theory overa large range of Weber numbers for both pressure conditions suggesting that thethinning of the liquid sheet plays a dominant role in setting the growth rate ofsinuous waves with minimal influence of the surrounding gas phase on its dynamics.
机译：最近的理论预测，即使在没有周围气相的情况下，在径向膨胀的液体板的中心产生的正弦波在空间上也会增长。与平坦的液体板不同，径向膨胀的液体板的厚度与距板中心的距离成反比。为了测试该理论的预测，在水平，径向扩展的液体薄片上进行了实验，该液体薄片是由单个喷嘴撞击固体撞击器形成的。后者被放置在扬声器振动器上，其振幅和频率受到控制。正弦波的增长是通过在大气压和低于大气压条件下使用反射激光测量波表面倾斜角来确定的。结果表明，在两种压力条件下，测得的增长率均与大范围韦伯数的理论预测相吻合，这表明液膜的稀薄化对设定正弦波的增长率起着主导作用，而对周围气相的影响最小。在其动力学上。

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