Acoustic analogy for multiphase or multicomponent flow
Acoustic analogy for multiphase or multicomponent flow
The Ffowcs-Williams and Hawkings (FW-H) equation is widely used to predict sound generated from flow and its interaction with impermeable or permeable surfaces. Owing to the Heaviside function used, this equation assumes that sound only propagates outside the surface. In this paper, we develop a generalized acoustic analogy to account for sound generation and propagation both inside and outside the surface. The developed wave equation provides an efficient mathematical approach to predict sound generated from multiphase or multicomponent flow and its interaction with solid boundaries. The developed wave equation also clearly interprets the physical mechanisms of sound generation, emphasizing that the monopole and dipole sources are dependent on the jump of physical quantities across the interface of multiphase or multicomponent flow rather than the physical quantities on one-side surface expressed in the FW-H equation. Sound generated from gas bubbles in water is analyzed by the newly developed wave equation to investigate parameters affecting the acoustic power output, showing that the acoustic power feature concluded from the Crighton and Ffowcs-Williams equation is only valid in a specific case of all bubbles oscillating in phase.
acoustic analogy, Multiphase Flow, multi-component flow, aeroacoustics
Mao, Yijun
3012974a-d258-4a40-8461-b4c41b9cf85c
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Mao, Yijun
3012974a-d258-4a40-8461-b4c41b9cf85c
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Mao, Yijun and Hu, Zhiwei
(2017)
Acoustic analogy for multiphase or multicomponent flow.
Transactions of the ASME: Journal of Vibration and Acoustics, 140, [021006].
(doi:10.1115/1.4037702).
Abstract
The Ffowcs-Williams and Hawkings (FW-H) equation is widely used to predict sound generated from flow and its interaction with impermeable or permeable surfaces. Owing to the Heaviside function used, this equation assumes that sound only propagates outside the surface. In this paper, we develop a generalized acoustic analogy to account for sound generation and propagation both inside and outside the surface. The developed wave equation provides an efficient mathematical approach to predict sound generated from multiphase or multicomponent flow and its interaction with solid boundaries. The developed wave equation also clearly interprets the physical mechanisms of sound generation, emphasizing that the monopole and dipole sources are dependent on the jump of physical quantities across the interface of multiphase or multicomponent flow rather than the physical quantities on one-side surface expressed in the FW-H equation. Sound generated from gas bubbles in water is analyzed by the newly developed wave equation to investigate parameters affecting the acoustic power output, showing that the acoustic power feature concluded from the Crighton and Ffowcs-Williams equation is only valid in a specific case of all bubbles oscillating in phase.
Text
ASME J Vib & Acoustics
- Accepted Manuscript
More information
Accepted/In Press date: 8 August 2017
e-pub ahead of print date: 4 October 2017
Keywords:
acoustic analogy, Multiphase Flow, multi-component flow, aeroacoustics
Identifiers
Local EPrints ID: 415909
URI: http://eprints.soton.ac.uk/id/eprint/415909
PURE UUID: a46ba5f3-6d56-4e2b-9560-c7357fbad867
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Date deposited: 28 Nov 2017 17:30
Last modified: 16 Mar 2024 05:57
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Author:
Yijun Mao
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