GAS Convect And Disffuse In The Lung

In view of respiratory physiology, the lung is a part of our body and i place where gas exchange to keep our life. But in view of hydrodynamics, ' lung is a complicated fluid field. So the respiratory physiology a hydrodynamics is the base of studying how gas convect and diffuse in the hi In this paper, we introduce the physiological structure and the process of | convection and diffusion in the lung. After analyzing some kinds mathematical model, we have got a digital model through simplifying l Weible model. The equation of one dimensional mathematical model i human lung is built. The study is transformed from three-dimensional space one dimensional problem. This paper is base on the test of single breath washout. According the law of Pick and convction-difussion, we have t equation of one dimensional mathematical model (like a trump).The curve tl describes the gas convection and diffusion is calculated , but it is a level li in the phase III and hasn't phase of IV.J. C. Cruz brought up the seven parallel regions lung mode and t calculation of it's correlated parameter, this time the curve can simulate ti phase III, but it was still not the steep part in the phase IV.We analyzed sevi main factor which affect the phase III and phase IV, and calculated the curv with considering airways closing and physiological dead space. The curve th describes the gas convection and diffusion is calculated and comparison wi the experiment is also carried out, especially in the phase IV.we also give the source term in the multi-breath, which involves ti exchanging of alveolar gas and blood gas. In addition to the above, we got tl three-dimensional lung model, which is close to the real lung structure ai settling a foundation of studying the gas convection and diffusion in the luni All these are very important to further study and to the diagnosis of lun disease.