NASAL INTERNAL AND EXTERNAL AERODYNAMICS FOR HEALTHY AND BLOCKED CAVITIES
Abstract
Human nasal airflow in a healthy and partially blocked cavities is investigated using computational and experimental means. While previous studies focused on the flow inside the nasal cavity, this study also looks at the external air stream coming out of the nostrils. The aim is to investigate the airflow subject to partial blocking in the nasal cavity and assess the potential of using a flow visualization method to identify abnormal nasal geometry. Two methods of study are used: Computational Fluid Dynamics (CFD) and experiment based on Particle Image Velocimetry (PIV). Nasal cavity geometry is reconstructed from CT scans. The flow visualization Schileren method is also demonstrated. The computational results agree well with the previous results in terms of Nasal Resistance (NR) and character of the internal flow. Good agreement is also found in the external aerodynamics during expiration between the computational and experimental results. Several generic partial blockages are investigated to show changes in NR, turbulence energy and the air stream leaving the nostrils during expiration. Anterior blockages are found to have more profound effects on all these three aspects, but all show effects on the external air stream. A possible universal angle for the external air stream emitted by a healthy nasal cavity is discussed.
References
- 1. , Nasal airflow in health and disease, Acat Otol 120 (5) :580–595, 2000. Web of Science, Google Scholar
- 2. , Detailed flow patterns in the nasal cavity, J Appl Physiol 89 (1) :323–337, 2000. Web of Science, Google Scholar
- 3. ,
Nasal airflow in a realistic anatomic geometry , in Direct and Large Eddy Simulation VI, Kluwer Academic Publishers, pp. 423–430, 2005. Google Scholar - 4. , Numerical simulation for detailed airflow dynamics in a human nasal cavity, Resp Physiol Neurobiol 161 (2) :125–135, 2008. Web of Science, Google Scholar
- 5. , Experimental study of velocity fields in a model of human nasal cavity by DPIV, Proc 7th Int Conf Laser Anemometry Advances and Applications, University of Karlsruhe, pp. 616–626, 1997. Google Scholar
- 6. , Particle image velocity measurements in complex geometries, Exp Fluids 29 (1) :91–95, 2000. Web of Science, Google Scholar
- 7. , Particle image velocimetry measurements for the study of nasal airlfow, Acta Oto-Laryngologica 126 (3) :282–287, 2006. Web of Science, Google Scholar
- 8. , Numerical simulation of airflow in the human nose, Eur Arch Otorhinolaryngol 261 (8) :452–455, 2004. Web of Science, Google Scholar
- 9. , Visualization of flow resistance in physiological nasal respiration: Analysis of velocities using numerical simulation, Arch Otolaryngol Head Nech Surg 132 (11) :1203–1209, 2006. Google Scholar
- 10. , Flow mechanisms in the human olfactory groove, Arch Otolaryngol Head Nech Surg 135 (2) :156–162, 2009. Google Scholar
- 11. , Investigation of the impact of the geometry on the nose flow, Euro J Mech B/Fluids 25 :471–490, 2006. Web of Science, Google Scholar
- 12. , Comparison of micron- and nanoparticle deposition patterns in a realistic human nasal cavity, Resp Physiol Neurobiol 166 (2) :142–151, 2009. Web of Science, Google Scholar
- 13. , Validation of a numerical method for assessment of human nasal airflow, AIAA 2005-5000, 35th AIAA Fluid Dynamics Conf,
Toronto , 2005, https://doi.org/10.2514/6.2005-5000. Google Scholar - 14. , Computational fluid dynamics (CFD) applied in the drug delivery design process to the nasal passages: A review, J Mech Med Biol 12 :1230002, 2012. Link, Web of Science, Google Scholar
- 15. , Numerical investigation of the flow field in realistic nasal perforation geometry, Allergy Rhinol 5 (2) :e70–e77, 2014. Google Scholar
- 16. , Yamasoba, Effect of nasal septum perforation repair surgery on three-dimensional airflow: An evaluation using computational fluid dynamics, Eur Arch Otorhinolaryngol 272 :3327–3333, 2015. Web of Science, Google Scholar
- 17. , Simulating the nasal cycle with computational fluid dynamics, Otolaryngol Head Nech Surg 152 (2) :353–360, 2015. Web of Science, Google Scholar
- 18. , Correlation between nasal airflow characteristics and clinical relevance of nasal septal deviation to nasal airway obstruction, Resp Physiol Neurobiol 192 :95–101, 2014. Web of Science, Google Scholar
- 19. , Impact of interior turbinate hypertrophy on the aerodynamics pattern and physiological function of the turbulent flow — a CFD simulation model, Rhinology 48 (2) :163–168, 2010. Web of Science, Google Scholar
- 20. , Investigations of the influence of external nose deformations on nasal airflow, ORL 67 (3) :154–159, 2005. Google Scholar
- 21. , On three-dimensionality and control of incompressible cavity flow, Phys Fluids 17 (10) :104103, 2005. Web of Science, Google Scholar
- 22. , Influence of the position of crew members on aerodynamics performance of two-man bobsleigh, J Biomech 39 (15) :2733–2742, 2006. Web of Science, Google Scholar
- 23. , On parallel pre-conditioners for pressure Poisson equation in LES of complex geometry flow, Int J Numer Methods Fluids 83 (5) :446–464, 2017. Web of Science, Google Scholar
- 24. , Review of computational fluid dynamics in the assessment of nasal air flow and analysis of its limitations, Eur Arch Otorhinolarygol 271 :2349–2365, 2014. Web of Science, Google Scholar
- 25. , A computational model of ureteral peristalsis and an investigation into ureteral reflux, Biomedical Eng Lett 8(1) :117–125, 2018. Web of Science, Google Scholar
- 26. , Velocity measurement in nasal cavities by means of sterioscopic PIV — Preliminary tests, J Phys: Conf Ser 882: 012010, 2017. Google Scholar
- 27. , Effect of anatomy on human nasal air flow and odorant transport implications for olfaction, Chem Senes 29 :365–379, 2004. Web of Science, Google Scholar
- 28. , Visualization of stereoscopic anatomic models of the paranasal sinuses and cervical vertebare from the surgical and procedural perspective, Anat Sci Educ 10 :598–606, 2017. Web of Science, Google Scholar
- 29. , Assessment of nasal airflow resistance in the healthy population of Chattisgarh by active anterior rhinomanometry, Indian J Otolaryngol Head Neck Surg 64 (4) :338–340, 2012. Google Scholar
- 30. , ABC of Ear, Nose and Throat, 5th edn., Blackwell Publishers, London, 2007. Google Scholar
- 31. , A deformable template method for describing and averaging the anatomical variation of the human nasal cavity, BMC Med Imag 16 :55, 2016. Web of Science, Google Scholar