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The speed of sound in a gaseous medium depends on various factors. Since gases constitute molecules that are free to move, they are highly compressible. Hence, sound waves travel slowly through gases. Thermodynamics helps us understand the relationship between pressure, volume, and temperature of gases, thus, the speed of sound in an ideal gas can be determined using the laws of thermodynamics. At the same time, Newton's laws of motion and the continuity equation of fluid dynamics also come...
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As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
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Most solids and liquids are incompressible—their densities remain constant throughout. In the presence of an external force, the molecules tend to restore to their original positions, which is only possible because the constituents interact. The interactions help the constituents pass on information about external disturbances, like sound waves. Therefore, sound waves travel faster through these media. Compared to solids, the constituents in a liquid are less tightly bound. Thus, sound...
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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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Sound speed, attenuation, and reflection in gassy sediments.

Guangying Zheng1, Yiwang Huang1, Jian Hua1

  • 1Acoustic Science and Technology Laboratory and College of Underwater Acoustic Engineering, Harbin Engineering University, 145 Nantong Street, Harbin 150001, China.

The Journal of the Acoustical Society of America
|September 3, 2017
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Summary
This summary is machine-generated.

This study introduces a new model for acoustic dispersion and attenuation in gassy sediments. It accurately predicts sound speed and reflection, offering advantages over existing models for gas-rich environments.

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Area of Science:

  • Geophysics
  • Acoustics
  • Sedimentology

Background:

  • Gassy sediments present unique acoustic challenges due to gas bubble presence.
  • Existing models may not fully capture the complex acoustic behaviors in these environments.

Purpose of the Study:

  • To develop a predictive model for acoustic dispersion and attenuation in gassy sediments.
  • To integrate gas-bubble pulsation effects with sediment physics for improved accuracy.

Main Methods:

  • Combined linear solution for gas-bubble pulsations in a viscoelastic medium.
  • Incorporated corrected Biot equations to account for pore fluid and solid framework interactions.
  • Derived reflection coefficient at the water/gassy-sediment interface.

Main Results:

  • The proposed model accurately predicts sound speed and attenuation in gassy sediments.
  • Demonstrated advantages over Anderson and Hampton's model by combining dispersion regimes.
  • Identified gas-bubble resonance as a key factor for high reflection coefficients.

Conclusions:

  • The new model provides a more comprehensive understanding of acoustic wave propagation in gassy sediments.
  • The model's ability to combine dispersion regimes enhances its predictive power.
  • Potential application in acoustic inversion for estimating gas-bubble size distributions.