论文标题
Leidenfrost的声音
Sounds of Leidenfrost drops
论文作者
论文摘要
我们表明，当将一滴水保持在其Leidenfrost政权中时，以周期性节拍的形式发出的声音会从滴水中散发出来。节拍排放的过程涉及两个不同的频率。一个组件是节拍本身的频率，其次是每次振荡发生在滴度发生时发出的声音频率。实验是通过在凹入金属表面上放置一滴水来进行的，并通过将麦克风固定在液滴上方来记录滴的节拍。摄像机也被固定在下垂上方以记录其振荡。简单的分析技术（例如音频信号的傅立叶和小波变换）以及滴的视频的图像处理已被用来洞悉Beat排放过程机制。该分析还有助于我们研究频率（如果有的话）对下降半径和底物温度的依赖性。
We show that when a drop of water is maintained in its Leidenfrost regime, a sound in the form of periodic beats emits from the drop. The process of beat emission involves two distinct frequencies. One component is the frequency of beats itself and second is the frequency of sound in every beat which is emitted when one oscillation in the drop occurs. Experiments have been performed by placing a drop of water over a concave metallic surface and the beats of the drop were recorded by fixing a microphone above the drop. A video camera was also fixed above the drop to record its oscillations. Simple analytical techniques like Fourier and wavelet transforms of the audio signals and image processing of the videos of the drop have been used to gain insight about mechanism of beat emission process. This analysis also helped us in studying the dependence of frequencies, if any, on the radius of the drop and the substrate temperature.
