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The nose and nasal cavity and sinuses are a parts of the upper respiratory system and study the air passage into the upper component of human airway is important to improve or cure deficiency in human respiration cycle. The nose performs many important physiological functions, including heating, humidifying and filtering inspired air, as well as sampling air to smell. Previously, numerical modeling of turbulent flow in nasal cavity, sinus, pharynx and larynx has rarely been employed Since the 1990s, with the development of computed tomography technology and computational fluid dynamics, a number of numerical studies on gas and particle flows in realistic nasal cavities have been conducted and provided precise data for deeper insight of the nature of nasal airflows. Also, most of pioneering studies in this field have been developed to the investigation of only nasal cavity without sinuses especially maxillary sinus So, this research is tried to study details of turbulent airflow through all spaces in human head that air can flow through. For this purpose, study has based on computed tomography scans image of a 26-years old female head, neck and chest without problems in her respiratory system from Shahid Chamran hospital, Shiraz, Iran. It is found that, nasal resistance was contribute up to half of the total airway resistance within the first 2-3 cm of the airway and the majority of the flow in this region remained close to the septum wall and only a small proportion reached the olfactory region.

Keywords: Nasal Cavity, Respiratory System, Turbulent Flow, Computational Fluid Dynamics

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