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Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering

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Published on: February 6, 2014

Non-reciprocal scattering in shear flow.

Charlotte Saverna¹, Yves Aurégan¹, Vincent Pagneux¹

¹Laboratoire d'Acoustique de l'Université du Mans, Le Mans, 72000, France.

The Journal of the Acoustical Society of America

|September 2, 2019

Summary

This summary is machine-generated.

This study explores acoustic scattering in shear flows, finding that dimensionless shear layer thickness can achieve perfect sound absorption or significant beam displacement for impedance walls.

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Area of Science:

Acoustics
Fluid Dynamics
Wave Propagation

Background:

Shear flows present complex acoustic scattering challenges.
Acoustic treatments, or impedance walls, are crucial for noise control.
Understanding wave interaction with shear layers is vital for aerodynamic applications.

Purpose of the Study:

To investigate acoustic scattering phenomena within shear flows.
To analyze the application of these phenomena to impedance walls.
To determine the influence of flow parameters on acoustic wave behavior.

Main Methods:

Characterization of shear flows using dimensionless shear layer thickness and mean Mach number.
Analysis of acoustic wave transmission through shear layers.
Study of acoustic wave reflection on impedance walls.

Main Results:

Identified dimensionless shear layer thickness as a key parameter.
Demonstrated the potential for perfect sound absorption.
Showcased the possibility of large lateral displacement of Gaussian beams.

Conclusions:

Dimensionless shear layer thickness is a critical factor for acoustic manipulation.
Effective acoustic absorption and beam steering are achievable using tailored shear layers.
The findings offer new insights for designing advanced acoustic treatments.