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We have all heard the irritating plink-plink sound of a dripping water faucet in the middle of the night. Now, Cambridge scientists have determined what causes the noise and found a simple way to render it silent.
A group of researchers from the University of Cambridge in the UK has published a study on the sound of dripping water, discovering exactly how the noise of a drop of water hitting a container filled with liquid is generated.
According to the scientists, the sound does not come from the impact of liquid on liquid. The splash, the momentary cavity formed by the impact, and the jet of water shooting up are all "effectively silent," the researchers said. Instead, the source of the noise is a small air bubble that forms at the bottom of the cavity. The trapped bubble then acts "like a piston," forcing water to oscillate and driving sound waves into the air.
"Using high-speed cameras and high-sensitivity microphones, we were able to directly observe the oscillation of the air bubble for the first time, showing that the air bubble is the key driver for both the underwater sound, and the distinctive airborne 'plink' sound," said PhD student Sam Phillips, one of the authors of the study, according to an article published on University of Cambridge website on Friday. The university also published a Youtube video based on the study.
www.dw.com
A group of researchers from the University of Cambridge in the UK has published a study on the sound of dripping water, discovering exactly how the noise of a drop of water hitting a container filled with liquid is generated.
According to the scientists, the sound does not come from the impact of liquid on liquid. The splash, the momentary cavity formed by the impact, and the jet of water shooting up are all "effectively silent," the researchers said. Instead, the source of the noise is a small air bubble that forms at the bottom of the cavity. The trapped bubble then acts "like a piston," forcing water to oscillate and driving sound waves into the air.
"Using high-speed cameras and high-sensitivity microphones, we were able to directly observe the oscillation of the air bubble for the first time, showing that the air bubble is the key driver for both the underwater sound, and the distinctive airborne 'plink' sound," said PhD student Sam Phillips, one of the authors of the study, according to an article published on University of Cambridge website on Friday. The university also published a Youtube video based on the study.
How to switch your dripping tap to 'silent' – DW – 06/22/2018
We have all heard the irritating plink-plink sound of a dripping water faucet in the middle of the night. Now, Cambridge scientists have determined what causes the noise and found a simple way to render it silent.
www.dw.com
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