## Abstract

The high-frequency part of the sound wave spectrum generated by an initial impact of a solid sphere falling onto a quiescent liquid surface is considered. At the initial stage of the process, when a sphere hits the liquid vertically, the usual equations of continuity, momentum, and state (in Tait's form) are used for a lower half-space. Moreover, the Kirkwood and Bethe hypothesis is used, too. This approximation allows the pressure field to be obtained and then the Fourier transform can be calculated for determination of the sound spectrum. It is shown that, in the first row approximation, the spectral density of the acoustic energy emitted by falling sphere diminishes approximately 4.3 decibels per octave.

Original language | English |
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Pages (from-to) | 321-323 |

Number of pages | 3 |

Journal | Physics of Fluids |

Volume | 10 |

Issue number | 1 |

DOIs | |

State | Published - 1 Jan 1998 |

## ASJC Scopus subject areas

- Computational Mechanics
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Fluid Flow and Transfer Processes