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Corresponding Author

Amany_Mahmoud@m-eng.helwan.edu.eg

Authors ORCID

https://orcid.org/0009-0003-5556-0806 ___ for Amany

Document Type

Original Study

Subject Areas

Mechanical Engineering

Keywords

Turbulence, Stenotic pipe, Laryngeal airflow, Higher eccentricity

Abstract

A complex transitional flow is produced in the larynx during air inhalation process, pivotal for fundamental comprehension and medical advancements in treatment methodologies. This study delves into the influence of the glottis region utilizing a simplified stenosis pipe geometry, examining two distinct cases: (1) the axisymmetric case and (2) the eccentric case. Reynolds-averaged Navier–Stokes equations with shear stress transport (SST) 𝑘 − 𝜔 turbulence model with intermittency transition activated with steady, Newtonian, and incompressible airflow have been used. The analysis underscores the significant impact of the eccentricity on the velocity by increasing 0.6% comparing with axisymmetric case, also particularly affecting the airflow jet. Stenosis induces alterations in primary airflow structures contingent upon various levels of eccentricity, marginally bolstering the laryngeal jet intensity at higher degrees of eccentricity. Conversely, it conspicuously impacts the recirculation zone, turbulent kinetic energy, and secondary vortices. Augmented eccentricity escalates recirculation zone and turbulent kinetic energy with 0.4 m2/s2, culminating in an amplified root mean square of axial velocity an indicator of heightened acoustic source terms compared to the axisymmetric case

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