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Acoustic streaming resulting from compression of the cochlear bony capsule
Charles Thompson1, Kavitha Chandra1
1Center for Advanced Computation and Telecommunications, University of Massachusetts Lowell, 1 University Ave., Lowell, Massachusetts 01854, USA.
The Journal of the Acoustical Society of America
|January 1, 2022
Summary
This study investigates acoustic streaming in the cochlea, revealing how cochlear pressure gradients arise from oval and round window velocity differences. The findings explain time-average fluid motion using advanced mathematical techniques.
Area of Science:
- Fluid dynamics
- Bioacoustics
- Auditory mechanics
Background:
- Understanding cochlear mechanics is crucial for hearing research.
- Acoustic streaming plays a role in fluid motion within biological systems.
- Previous models often simplify the complex fluid dynamics of the cochlea.
Purpose of the Study:
- To analyze acoustic streaming generated by cochlear capsule compression.
- To model the cochlear pressure in relation to cochlear partition velocity.
- To investigate the impact of oval and round window velocity asymmetry on cochlear pressure gradients.
Main Methods:
- Formulating cochlear pressure as an integral equation based on cochlear partition velocity.
- Incorporating high-order fluid modes and evanescent pressure modes due to rapid velocity variations.
- Employing matched asymptotic expansions and numerical evaluation for time-average fluid motion.
Main Results:
- Demonstrated that asymmetry in oval and round window velocities creates a pressure gradient across the cochlear partition.
- Showcased the necessity of evanescent pressure modes for analyzing rapid spatial variations in cochlear partition velocity.
- Successfully obtained the time-average fluid motion within the cochlear system.
Conclusions:
- The study provides a detailed analysis of acoustic streaming in the cochlea.
- Highlights the importance of fluid modes and pressure gradients in cochlear mechanics.
- Offers a framework for understanding fluid dynamics in the auditory system.
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