Particle image velocimetry measurements for the study of nasal airflow.
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.


OBJECTIVE
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.


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.
Kim
Jin Kook
JK
Department of Otorhinolaryngology-Head and Neck Surgery, Konkuk University College of Medicine, Seoul, Korea. jkkimmd@kuh.ac.kr
Yoon
Joo-Heon
JH
Kim
Chang Hoon
CH
Nam
Tae Wook
TW
Shim
Dae Bo
DB
Shin
Hyang Ae
HA
D000403:Airway Resistance; D000465:Algorithms; D045853:Exhalation / Q000502:physiology; D006801:Humans; D001239:Inhalation / Q000502:physiology; D008953:Models, Anatomic; D009296:Nasal Cavity / Q000502:physiology*; D010316:Particle Size; D015203:Reproducibility of Results; D012212:Rheology; D025363:Rhinomanometry / Q000379:methods*; D012680:Sensitivity and Specificity