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学术报告——Transport and Deposition of Particles and Fibers in Human Upper Tracheobronchial Airways

2011年07月19日 00:00 来源:大连理工大学工程力学系 点击:[]

田 琳 博士

Mechanical Engineering Technology Department,StateUniversityofNew York,Canton

 

时间:201182(星期二)  上午10:00

地点:综合I号实验楼 602会议室

工程力学系

工业装备结构分析国家重点实验室


ABSTRACT

Elongated fibers are hazardous to human health due to the incapability of removing them from the respiratory system once inhaled. The high occurrence of bronchial carcinoma and lung cancer in certain occupational environment is linked to human exposure to these particles. Due to the anisotropy of fiber geometry, very limited work has been reported to study its dynamical behavior in human airway passages. This research studies the transport phenomena of ellipsoidal fibers within the human respiratory system. The objective is to develop an efficient computational model to analyze and predict the transport and deposition of inhaled particles in the human tracheobronchial airways. The dynamics of the ellipsoidal fiber in the human airways are given by the Lagrangian simulation along the fibers’ trajectory. The motion of the fiber, and its relationships with the breathing rate, fiber size and shape, particle-to-fluid density ratio, and the local airway features are discussed. In addition, accuracy of various turbulence models to predict particle transport and deposition in bounded turbulent flows is analyzed.

 

Dr. Lin Tian

Dr. Lin Tian, Assistant Professor at the State University of New York atCanton, has been working in the field of CFD study of spherical and fibrous particle transport and deposition in laminar and turbulence airflow field for the past seven years. The results are applied to better understand human respiratory dosage/exposure to particular contaminants in the size range from nano to micro meters. The results have been widely applied to a broad range of applications involving nano- and micro- particle transport, e.g. design of efficient respiratory drug delivery systems, indoor particular contaminant transport, milk powder manufacturing processes, fine particle deposition in ducts and pipes, etc.  Dr. Lin Tian has published a fundamental study of comparing RANS-Lagrangian models in predicting particle transport and deposition in turbulence channel flows by using different turbulence models (k-ε and RST, Reynold stress transport model). Key contribution of the work is the identification of the source, for causing over prediction of fine particle depositions in wall bounded airflows by using the widely adopted isotropic RANS-Lagrangian models (k-ε). In addition, effective near wall anisotropic adjustment, to particle-turbulence dynamics, was proposed and verified which improves the modeling accuracy significantly. The work was published in Journal of Aerosol Science and ranked in the top 50 most accessed papers from 2007 to 2010. The research outcome has great impact and been widely applied in various industries involving turbulence and particle transport. 

Over the past three years, Dr. Lin Tian has been working jointly with Mechanical & Aeronautical Engineering Department of Clarkson University to further advance the study and explore new opportunities in the field of fine particle transport in human and indoor environment.

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