用计算流体动力学模拟呼吸系统中吸入和呼出的湍流气流

Q1 Chemical Engineering

International Journal of Thermofluids Pub Date : 2025-02-14 DOI:10.1016/j.ijft.2025.101139

Dheyaa J. Jasim , Mustafa Habeeb Chyad , Laith S. Sabri , Soheil Salahshour , Omid Ali Akbari , M. Hekmatifar

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引用次数: 0

摘要

本研究对呼吸道的CFD模拟进行了探讨。尽管研究人员进行了大量的研究，但在呼吸系统领域进行的研究有限，以检查呼吸系统作为吸入和呼出的各种输入结构的真实模型。本研究旨在开发一种可靠的方法，从一位24岁男性的CT扫描数据中获得真实的呼吸系统几何形状，并准备将其输入CFD软件。本研究采用流速为60升/分钟的湍流气流模式，对吸入和呼出两种模式下的鼻腔气流进行了数值分析。采用CFD紊流模拟方法，模拟了不同输入量对平面、管状和半球形截面人体呼吸系统内气流的影响。结果表明，空气进入鼻咽部时速度增大。在平面、管道和半球形模式下，速度分别从2.8 m/s、2.07 m/s和4.14 m/s增加到7.41 m/s、5.48 m/s和8.40 m/s。平面、管道和半球形模式的动压降系数Cp分别从79.38、34.24和69.57降至32.84、17.13和31.44。平面模式、管道模式和半球形模式的速度分别从7.46 m/s、4.45 m/s和10.29 m/s下降到1.54 m/s、0.96 m/s和2.70 m/s。在平面和管道模式下，Cp分别从17.17、-5.46、34.01和29.75增加。随着空气进入喉部，速度增加。数值上，平面模式、管道模式和半球形模式的速度分别从5.00 m/s、2.78 m/s和7.35 m/s增加到9.06 m/s、6.56 m/s和9.79 m/s。管状和半球形模式下Cp增大。速度随着空气进入气管而降低。数值上，平面模式、管道模式和半球形模式的速度分别从6.69 m/s、4.86 m/s和7.16 m/s下降到3.44 m/s、3.44 m/s和3.90 m/s。管道模式和半球形模式的Cp分别从0.77、-1.59降低到-7.33、-11.51。

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Simulation of the turbulent air flow of inhalation and exhalation in the respiratory system using computational fluid dynamics

In this research, the CFD simulation of the respiratory tract was discussed. Limited research was conducted in the field of respiratory systems to examine the respiratory system as a true model for various input structures in inhalation and exhalation, although numerous studies were conducted by researchers. This study aimed to develop a dependable method for obtaining the true respiratory system geometry from a 24-year-old man's CT scan data and preparing it for input into CFD software. this research performs a numerical analysis of the airflow from the nasal inlet in both the inhalation and exhalation modes, using a turbulent airflow mode with a flow rate of 60 liters per minute. The effect of different inputs on the airflow in the human respiratory system is simulated for flat, pipe, and semi-spherical cross sections using CFD for turbulent flow. The results show that the velocity increased as air entered the nasopharynx. In flat, pipe, and semisphere modes, the velocity increased from 2.8 m/s, 2.07 m/s, and 4.14 m/s to 7.41 m/s, 5.48 m/s, and 8.40 m/s, respectively. The Dynamic pressure drop coefficient)C_p(in flat, pipe, and semisphere modes decreased from 79.38, 34.24, and 69.57 to 32.84, 17.13, and 31.44, respectively. The velocity in flat, pipe, and semisphere modes decreased from 7.46 m/s, 4.45 m/s, and 10.29 m/s to 1.54 m/s, 0.96 m/s, and 2.70 m/s, respectively. In the flat and pipe modes, the Cp increased from 17.17, -5.46, to 34.01, and 29.75, respectively. Velocity increased as air entered the larynx. Numerically, the velocity in flat, pipe, and semisphere modes increased from 5.00 m/s, 2.78 m/s, and 7.35 m/s to 9.06 m/s, 6.56 m/s, and 9.79 m/s, respectively. The C_p increased in pipe and semisphere modes. Velocity decreases as the air enters the trachea. Numerically, the velocity in flat, pipe, and semisphere modes decreased from 6.69 m/s, 4.86 m/s, and 7.16 m/s to 3.44 m/s, 3.44 m/s, and 3.90 m/s, respectively. The C_p in the pipe and semisphere modes decreased from 0.77, and -1.59 to -7.33, and -11.51, respectively.

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