啊，倒凉水的清凉声音。你想想就会觉得口渴。或者，如果你是一名科学家，你可能会感到好奇。
机械工程师穆阿德·布迪纳(Mouad Boudina)和他的同事想要了解浇注条件是如何影响这种诱人声音的音量的。研究人员发现，关键在于流入的水流在下降时产生了多少涟漪。
当水柱落下时，一种被称为瑞利高原不稳定性的效应会导致平滑的水流在最终分解成水滴之前形成块状和凸起。这些波纹撞击液体表面，形成气泡振动并发出声音。
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In laboratory experiments, water poured from a tube close to the surface of a water vessel was inaudible, as the stream hadn’t fallen far enough to form ripples. For water poured from a greater height, the streams became bumpy, and?the sound was louder, Boudina, of Seoul Natio
The width of the stream of water mattered, too.?Thinner jets were louder than thicker jets poured from the same height. That’s because, as they fall, thin streams become wiggly more quickly, as compared to thicker ones.
o
Questions or comments on this article? E-mail us at?[email
M. Boudina, J. Kim and H.-Y. Kim.?Amplitude of water pouring sound.?Physical Review Fluids. Vol. 8, December 2023, p. L122002. doi: 10.1103/PhysRevFluids.8.L122002.
Physics writer Emily Co
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