4667

4395

كارشناسي ارشد

تبديل انرژي

اصفهان:دانشگاه صنعتي اصفهان،دانشكده مكانيك

1387

[چهارده]،113، [II]ص.:مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمد سعيد سعيدي، احمدرضا عظيميان

88/7/13

ابراهيم شيراني، احمدرضا پيشه ور

مهندسي مكانيك

ID4395

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

117 Air Flow Simulation and Particles Tracking in Alveolar Duct Zone of Human s Lung Ehsan Allah Saadati ehsan saadati@yahoo com 15 3 2009 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc language Farsi Mohammad Said Saidi mssaidi@sharif edu Ahmad Reza Azimian azimian@cc iut ac ir Abstract In this project simulation of fluid flow and tracking particles in the human s lung alveolar duct have been performed using Computational Fluid Dynamic CFD For this purpose laminar fluid flow in the human alveolar duct has been performed using deforming zones ability of dynamic mesh method Despite of the most of simulations fluid flow simulation has been done absolutely time dependently and inlet and outlets of solution domain have been applied automatically from domain boundaries motion The simulated cases can be divided into three groups In the first group particle tracking and determination deposition efficiency of cigarette smokes is done In the second group tracking and determination deposition efficiency of microorganisms like Influenza Viruses have been performed Finally in the third group investigating effects of special zone of human s lung deforming zone on the lung performance has been carried out Time dependent particle tracking has been done accurately using fluid flow simulation results For this purpose Brownian motion of sub micron particles has been considered using polar type of random number generators Final results show that deposition efficiency for sub micron particles has a reverse trend with particle size Efficiency will decrease after increasing particle size The main reason for this is that randomized Brownian motion of air molecules will affect particles more if the particle size is small Simulations results of micro organism motion in human alveolar zone for two sizes of particles 30 nanometer and 0 2 micrometer demonstrates higher values of deposition for finer micro organisms compared with larger ones Finally simulation results for malfunction of some parts have been done for two different conditions of alveolar duct malfunction The results show that in both cases deposition efficiency will decrease This phenomenon is clearer for coarser particles in the second case Key Words Lung Lump model Resistance Inductance Capacitance Bifurcation Electric circuit

محمد سعيد سعيدي، احمدرضا عظيميان

ابراهيم شيراني، احمدرضا پيشه ور