عنوان :
تعيين ويژگيها و انتقال گرما در مواد تغيير فازدهنده حاوي مواد نانو ساختار به روش تجربي
گرايش تحصيلي :
تبديل انرژي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
[نوزده]،201ص.: مصور،جدول،نمودار﴿رنگي﴾
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
علي اكبرعالم رجبي
استاد مشاور :
ابراهيم شيراني
توصيفگر ها :
ضريب هدايت گرمايي , لزجت , فرايند ذوب , فرايند انجماد
تاريخ نمايه سازي :
94/2/6
استاد داور :
حسين شكوهمند،بهزاد قاسمي،محسن نصراصفهاني،محمدرضا سليم پور
كد ايرانداك :
ID740 دكتري
چكيده انگليسي :
۲۰۲ Determining Properties and Heat Transfer in Phase Change Materials Containing Nanostructured Materials Using Experimental Method Sadegh Motahar s motahar@me iut ac ir Date of Submission 2015 02 02 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree Ph D Language FarsiSupervisor Ali Akbar Alemrajabi rajabi@cc iut ac irAbstract Phase change materials PCM are extensively employed as thermal energy storage media in solar thermalenergy storage efficient buildings and thermal protection of electronics The most important problem in usingPCMs especially organic PCMs is their low thermal conductivity that drastically affects the rate of phasechange process melting and solidification of PCM In the recent years by the development in nanotechnology high thermal conductivity nanostructured materials have been produced In the present study thermalconductivity and rheological behavior of n octadecane with dispersed nanostructured materials includingmesoporous silica MPSiO2 titanium IV oxide TiO2 carbon nanotubes MWCNTs and carbon nanofibers CNFs at various particle mass fractions and temperatures are experimentally investigated A maximumthermal conductivity enhancement of almost 5 for TiO2 and MPSiO2 were experimentally obtained MWCNTs and CNFs enhance the thermal conductivity of PCM up to 40 and 20 respectively Theexperimental results on the viscosity showed that for mass fractions of MPSiO2 and TiO2 nanoparticles greaterthan 3 in liquid PCM the behavior of liquid is non Newtonian Also the viscosity of PCM containingnanoparticles was measured to be increased compared to the liquid PCM An enclosure with a constant heat fluxwall was used to evaluate the melting process The results showed that the melting rate decreases by dispersingTiO2 nanoparticles in n octadecan Solidification experiment was performed using the same enclosure withconstant wall temperatures The results interestingly represented the improvement in solidification by addingnanoparticles Keywords phase change materials nanostructured materials thermal conductivity viscosity meltingheat transfer solidification
استاد راهنما :
علي اكبرعالم رجبي
استاد مشاور :
ابراهيم شيراني
استاد داور :
حسين شكوهمند،بهزاد قاسمي،محسن نصراصفهاني،محمدرضا سليم پور
