پديد آورنده :
رضوي، عاطفه
عنوان :
بررسي جريان خون در شريان كاروتيد همراه با گرفتگي متقارن با استفاده از مدل نيوتني و شش مدل غير نيوتني
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
هفده، 128ص: عكس جدول، نمودار
يادداشت :
ص.ع. به: فارسي و انگليسي
استاد راهنما :
ابراهيم شيراني
استاد مشاور :
غلامرضا اعتماد
توصيفگر ها :
تنش برش ديواره , جدايي جريان , فاكتور اهميت كلي , شاخص برشي نوساني
تاريخ نمايه سازي :
5/11/88
استاد داور :
احمد رضا پيشه ور، محمود اشرفي زاده
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتال
چكيده انگليسي :
Investigation of blood flow through arterial stenosis using Newtonian and Non Newtonian models Atefeh Razavi Atefe Razavi@gmail com 2009 05 23 Department of Mechanical engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M sc Language FarsiSupervisor Professor Ebrahim ShiraniAbstractArterial stenosis is a common disease and a major cause of death in developed countries Because of the importantrole of hemodynamic factors in the formation and progression of the stenosis modeling of blood behavior has beenstudied by researchers for many years In the present study blood is simulated as both steady state and pulsatilelaminar in a common carotid artery with an axisymmetric stenosis assuming rigid and impermeable walls Governing equations continuity and momentum have been solved by finite element method Newtonian and sixnon Newtonian models are used to describe blood behavior Hematocrit is applied in modified Casson and Walburn Schneck models Hemodynamic parameters such as radial velocity wall shear stress global importance factor separation and reattachment points have been calculated According to obtained results separation zone is thelongest for Newtonian model and is more affected under changes like Reynolds number and stenosis severity Basicdifference between steady and pulsatile conditions is for the recirculation zone length and so for the globalimportance factors because under pulsatile condition blood flow can not adjust itself with velocity fluctuations atthe inlet At lower velocities global importance factors show more values and differences of models are moreconsiderable At low shear rates power law model is not appropriate Generalized power law and Carreau Yasudamodels show very similar behavior at most shear rates non Newtonian effects become more significant byincreasing hematocrit Choosing the best model depends on having experimental data The results have convenientagreement with previous works Key wordsStenosis Wall shear stress Flow separation Newtonian Non Newtonian blood flow Globalimportance factor Oscillatory shear index
استاد راهنما :
ابراهيم شيراني
استاد مشاور :
غلامرضا اعتماد
استاد داور :
احمد رضا پيشه ور، محمود اشرفي زاده
