4956

4660

كارشناسي ارشد

تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1388

چهارده، 140ص: مصور، جدول، نمودار

ص.ع. به: فارسي و انگليسي

محمد سعيد سعيدي، احمدرضا عظيميان

28/10/88

احمد صابونچي، محسن دوازده امامي

1396/09/25

كتابنامه

مهندسي مكانيك

ID4660

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

Airflow Simulation in Human Lung Bifurcations for Determination of Lumped Model Parameters in Lung Ahmad Asiaban ahmadasiaban@yahoo ca 22 4 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 irAbstractHuman respiration system is complicated and the relation between pressure and flow in a respiratory treestructure consisting of a large number of tube segments and bifurcations is difficult To facilitateinvestigation of ventilation distribution in the lungs efforts have been directed towards development of someanalog models in which the resistive inertial and elastic properties of the respiratory system have beensimulated by similar method in electrical system ie the RLC electrical circuits for each of the maincompartments The purpose of this study is to solve flow in different bifurcations in the respiration systemand to determin the lumped model parameters Viscous resistance is determined by solving steady flow inrigid bifurcations The effect of inertia which is called inductance is determined by solving unsteady flow forinviscid fluid in rigid bifurcations To determine the effect of wall elasticity which is called capacitance theunsteady flow is solved To determine capacitance parameter dynamic mesh model in the Fluent software isused The result of the present study shows that viscous resistance is different in different bifurcations Simulations show that viscous resistance in bronchi within lobe and bronchiole models is almost constant andis near to Poiseuille flow resistance in a tube However analytical equation in a tube is accurate but it is notexactly accurate in bifurcations in the respiration system Solving the governing equations in differentfrequencies and with various inlet air volumes show that by increasing the frequency and entering air volumeto the model inlet pressure and entering air volume to the daughter branches increase Also by increasingfrequency and entering air volume to the model the pendelluft phenomena in each respiration cycle willincrease Key WordsLung Lump model Resistance Inductance Capacitance Bifurcation Electric circuit

محمد سعيد سعيدي، احمدرضا عظيميان

احمد صابونچي، محسن دوازده امامي