西藏颂钵的秘密

Buddhists have used the lulling hum of Tibetan singing bowls for thousands of years to begin and end their meditations. Today, physicists are using these same bowls to better understand fluid dynamics. The bronze alloy bowls are standing bells that resonate when struck or rubbed (right). When filled with water, the liquid dances to the vibrations. In a paper published today inNonlinearity, researchers examined these hydroacoustic properties in four 5th-century singing bowls from the Himalayas. They rigged a speaker to play tones resonant with each individual bowl and then watched how the water responded at different amplitudes. As the amplitude increased, waves formed on the surface, eventually grew chaotic, then crashed into one another, shooting up droplets (top). At certain frequencies and amplitudes, these droplets appear to float and wander across the surface. Though scientists have extensively studied similar dynamics in wine glasses, this is the first study to do so in singing bowls.
几千年来，西藏僧侣冥想前后都要以颂钵之声作为仪式不可少的一部分。现在物理学家研究了颂钵背后的流体动力学，破解其秘密(视频)。报告发表在《非线性》期刊上。比利时列日大学和MIT的科学家，对来自喜马拉雅山脉的4个5世纪的颂钵的水声特性进行了分析。他们操控一个扬声器对每个碗播放声调共振，随后观察了液体如何对不同的振幅作出响应。结果显示，随着振幅的增加，波浪开始在液体的表面形成，直至最终变得没有秩序，并相互碰撞在一起，进而喷出液滴。在某些频率和振幅下，这些液滴看起来似乎在表面上漂浮和漫步