Particle image velocimetry measurements for nasal airflow

Particle Image Velocimetry (PIV) is a whole-flow-field technique providing instantaneous velocity vector measurements in a cross-section of a flow. This technique being a non-intrusive one, allows the application of PIV in high speed flows, boundary layer studies of fluids.

Particle image velocimetry measurements for nasal airflow

Postby arunraje on Tue Dec 29, 2009 9:33 pm

Particle image velocimetry measurements for the study of nasal airflow
Jin Kook Kim, MD, PhD1†, Joo-Heon Yoon‌2,34,5, Chang Hoon Kim‌2,3, Tae Wook Nam‌1, Dae Bo Shim‌1 and Hyang Ae Shin‌1
1Department of Otorhinolaryngology—Head and Neck Surgery, Konkuk University College of Medicine, Seoul, Korea
2Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Korea
3The Airway Mucus InstituteYonsei University College of Medicine, Seoul, Korea
4Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
5Biomolecule Secretion Research Center, Yonsei University College of Medicine, Seoul, Korea
†Correspondence: Jin Kook Kim, Department of Otorhinolaryngology—Head and Neck Surgery, Konkuk University College of Medicine, 1 Hwang-dong, Gwangjin-gu, Seoul, 143-701, Korea, +82 2 2030 7661, +82 2 2030 7749 jkkimmd@kuh.ac.kr

http://informahealthcare.com/doi/abs/10.1080/00016480500361320


Conclusions. Particle image velocimetry (PIV) permits investigation of the distribution and velocity of the airflow in the nasal cavity. During breathing, the main laminar flow stream passes through the middle meatus and turbulent flow can be detected under physiologic conditions. Objectives. Physical models or casts of the nasal cavity have been utilized in several studies in an effort to understand its aerodynamics. PIV is a new technique for measuring the aerodynamic properties of tubular structures. In this article we evaluate nasal airflow characteristics during physiologic breathing under normal conditions and the usefulness of PIV. Material and methods. A nasal model cast obtained by a combination of rapid prototyping and solidification of clear silicone was connected to a pump which simulated the physiological pressure in the upper airway system. A glycerol–water mixture was used as the flow material. The airstream was marked with spherical polyvinyl particles, observed through solidified clear silicone and analyzed using PIV. Results. The main flow within the cavity, which was mostly laminar, passed through the middle meatus. Turbulence was clearly visible in the anteroinferior part of the middle turbinate. The flow rate was highest at the middle meatus during inspiration and expiration.
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