Detailed analysis of the relationship between geometry and airflow in older Chinese adult male nasal cavities

Read, S 2016, Detailed analysis of the relationship between geometry and airflow in older Chinese adult male nasal cavities, Masters by Research, Engineering, RMIT University.


Document type: Thesis
Collection: Theses

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Title Detailed analysis of the relationship between geometry and airflow in older Chinese adult male nasal cavities
Author(s) Read, S
Year 2016
Abstract Older nasal cavities tend to exhibit a range of symptoms and pathologies more frequently than those of younger patients. These symptoms include variations in airconditioning functionality, as well as olfaction and mucosal clearance functionality. Several factors have been identified as potentially responsible for these symptoms. One issue that has been identified as a potential cause for a number of the identified symptoms is aberrations in airflow structures caused by age-related variations in nasal cavity anatomy. Various methods have been used to examine nasal patency between demographics, including Computational Fluid Dynamics (CFD) studies of airflow through nasal cavity models developed from Computed Tomography (CT) scans. To date CFD methods have not been used to examine airflow in older nasal cavities.

This study will apply previously developed techniques for interdemographic analysis to CFD simulation results from a series of older, Asian, adult male nasal cavity models. Firstly the reconstruction methods used for creating the nasal cavity geometries are detailed. The discretisation and setup of the CFD simulations carried out for the five models are then outlined. The results are then discussed.

This study provides preliminary understanding connecting nasal anatomy, age and airflow dynamics. Although the study size was limited, it provides insight into potential relationships between inhaled airflow characteristics and geometry. In particular discrepancies are noted in pressure drop, where the more voluminous cavities showed lower overall resistance: an overall
pressure drop of 13 Pa was noted for the thinnest cavity as opposed to 2 Pa for the most voluminous; wall shear distribution, where the concentration at the nasal valve was significantly reduced in the larger cavities: a peak of 0.16 Pa was noted for the thinnest cavity as opposed to 0.04 for the widest; as well as heat and vapour transfer, where higher volume cavities - in particular across the nasal valve - showed lower heat and vapour transfer rates. It is concluded that there are clear correlations between cavity volume and airflow characteristics within the nasal cavity.
Degree Masters by Research
Institution RMIT University
School, Department or Centre Engineering
Subjects Otorhinolaryngology
Computational Fluid Dynamics
Keyword(s) CFD
Biomechanical engineering
Geriatrics
Rhinology
Nasal airflow
Nasal cavity
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Created: Wed, 07 Jun 2017, 15:51:31 EST by Adam Rivett
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