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Background and Objectives:Several studies have utilized physical models or casts of the nasal cavity in an efort to understand the relationship betwen nasal anatomy and the distribution of inspired or expired airflow. This paper deals with the evaluation of nasal airflow characteristics during physiologic breathing in normal conditions. Materials and Method:The choana of a nasal model casting by a combination of rapid prototyping and solidification of clear silicone was connected to a pump that marked with polyvinyl spherical particles, and was observed through an solidificated clear silicone and analyzed with particle image velocimetry. Results:Turbulence is clearly visible at the level of the head of the midle turbinate. The maximal velocity was recorded at the superior meatus. The flow rate was highest at the midle meatus. Conclusion:This model allows the in-vestigation of airflow distribution and velocity under physiologic conditions. The main flow stream pases through the middle meatus. (Korean J Otolaryngol 2002 ;45 :1063-8)


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