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Amplitude of water pouring sound

Mouad Boudina1,2, Joonoh Kim1, and Ho-Young Kim1,3,*

  • 1Department of Mechanical Engineering, Seoul National University, Seoul 08826, Korea
  • 2Department of Mechanical Engineering, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
  • 3Institute of Advanced Machines and Design, Seoul National University, Seoul 08826, Korea

  • *hyk@snu.ac.kr
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Phys. Rev. Fluids 8, L122002 – Published 21 December, 2023

DOI: https://doi.org/10.1103/PhysRevFluids.8.L122002

Abstract

We experimentally investigate the amplitude of the common sound heard when we pour water, tea, or coffee on a filled receptacle. Using water jets from circular nozzles, we find that pouring is audible when the nozzle distance from the free surface is above one-third of the jet breakup length. The sound amplitude increases with the steepness of the jet corrugation, informing that thin jets are louder than thick ones for a given pouring height. Since the jet corrugation is related to the air entrainment rate, the sound of pouring can serve as a practical noninvasive probe in aeration processes. After the jet breaks up into drops impacting on the free surface, the pouring sound amplitude increases with the nozzle diameter, unlike before breakup.

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synopsis

Turning up the Volume of Pouring Water

Published 21 December, 2023

The volume of the sounds produced when a fluid jet hits the surface of a liquid depends on the shape of the jet.

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Supplemental Material

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Outline

Information

Phys. Rev. Fluids 8, L122002– Published 21 December, 2023
  • Received 5 May 2023
  • Accepted 8 November 2023
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