Xiong Guan-xia, Li Jian-feng, Lei Wen-bin, Zhou Xu-hui, Zhan Jie-min, Xu Geng
Otorhinolaryngology Hospital, SUN Yat-sen University, Guangzhou 510080, China.
Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi. 2011 Nov;46(11):928-32.
To study the aerodynamics of the normal human nasal cavity under different ambient temperatures.
Based on CT scanning, a model of a healthy adult's nasal cavity was established using computational fluid dynamics software from Fluent. Airflow in this model was simulated and calculated at ambient temperatures of 0 °C, 24 °C, and 37 °C during periodic breathing.
Ambient temperature only had an impact on the temperature in the nasal cavity during the inspiratory phase, and the temperature distribution was not symmetrical in the inspiratory acceleration and deceleration phases. The ambient temperature significantly affected airflow speed in main nasal passages during the inspiratory process, but had little impact on flow status (proportion and streamline of airflow in different nasal passages). Temperature differences increased the irregular air movement within sinuses. The anterior nasal segment, including the area between the valve and the head of the middle turbinate, was the most effective part of the nasal airway in heating the ambient air.
Our findings describe the effects of ambient temperature on airflow parameters in the nasal cavity within a single respiratory cycle. This data is more comprehensively and accurately to determine the relationship between nasal cavity aerodynamics and physiological functions.
研究不同环境温度下正常人体鼻腔的空气动力学特性。
基于CT扫描，使用Fluent计算流体动力学软件建立健康成年人鼻腔模型。在周期性呼吸过程中，对该模型在0°C、24°C和37°C环境温度下的气流进行模拟和计算。
环境温度仅在吸气阶段对鼻腔内温度有影响，且在吸气加速和减速阶段温度分布不对称。环境温度在吸气过程中显著影响主要鼻道内的气流速度，但对气流状态（不同鼻道内气流的比例和流线）影响较小。温度差异增加了鼻窦内空气运动的不规则性。包括鼻阈与中鼻甲头部之间区域在内的鼻前段是鼻气道加热环境空气最有效的部分。
我们的研究结果描述了环境温度在单个呼吸周期内对鼻腔气流参数的影响。这些数据能更全面、准确地确定鼻腔空气动力学与生理功能之间的关系。
