پديد آورنده :
سرگردان مغانلو، سميه
عنوان :
بررسي عددي انتقال حرارت و جريان نانوسيال در ميكروكانال هاي مستطيلي چرخان با سطوح آب گريز
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
تبديل انرژي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
بيست و يك، ۱۵۲ص.: مصور، جدول، نمودار
استاد راهنما :
احمد سوهانكار
استاد مشاور :
محسن دوازده امامي
توصيفگر ها :
شبيه سازي عددي , ميكروكانال U شكل چرخان , سطوح آب گريز , نسبت منظري , نانوسيال , روش اويلر-لاگرانژ , روش اويلرين , انتقال حرارت , افت فشار , ضريب عملكرد حرارتي
استاد داور :
محمدرضا توكلي، مهدي نيلي احمد آبادي
تاريخ ورود اطلاعات :
1397/01/26
چكيده انگليسي :
Numerical Investigation of Nanofluid In Rotating U shaped Rectangular Microchannel with Hydrophobic Surface Somayeh Sargordan s sargordan@me iut ac ir Date of submission 2018 02 12 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Ahmad Sohankar asohankar@cc iut ac irAbstract In this work the effects of three parameters including aspect ratio hydrophobic surface slip boundary condition and water Al2O3 nanofluid in a rotating U shaped microchannel were investigated numerically The fluid flow and the convective heat transfer assuming a 3D steady flow with constant and variable properties were simulated with Ansys Fluent In order to apply the slip boundary condition on the microchannel walls the additional code was provided and employed in Fluent At the first part the effect of aspect ratio on the fluid flow and heat transfer were investigated using the pure water in hydrophilic no slip rotating microchannel In this part the aspect ratio of 0 25 to 4 Reynolds number of 400 and rotational speed between 0 and 600 rad s were employed and velocity profile temperature profile pressure drop Nusselt number and thermal performance coefficient were investigated The result of this part showed that increasing the aspect ratio in a horizontal microchannel and decreasing aspect ratio in vertical microchannel provided an increase in pressure drop and heat transfer In the second part of this work the effect of slip and temperature jump boundary conditions in rotating U shaped microchannel was investigated Assuming 5 micron slip length the result showed that the slip condition causes a decrease in the pressure drop and heat transfer In addition the thermal performance coefficient of hydrophobic microchannel is higher than that of hydrophilic microchannel Finally in the third part water Al2O3 nanofluid in a rotating hydrophobic U shaped Microchannel were investigated by single phase model constant properties and variable properties and Eulerian Eulerian two phase model for volume fraction 1 2 5 and 4 percent It is found that there is a large variation in temperature gradient along the micro channel thus the effect of temperature on nanofluid properties are large and using constant properties condition can provide inaccurate results Also effectiveness of nanofluid depends on geometry of micro channel and properties of nanofluid thus in the present micro channel effectiveness of nanofluid is negative that means using nanaofluid can t enhance heat transfer and it is not recommended Finally the results of single phase with variable properties and Eulerian Eulerian two phase model are in a good agreement Keywords Numerical investigation rotating U shaped Microchannel hydrophobic surface aspect ratio nanofluid Euler Lagrange method Eulerian Eulerian method heat transfer pressure drop performance coefficient nanoparticle
استاد راهنما :
احمد سوهانكار
استاد مشاور :
محسن دوازده امامي
استاد داور :
محمدرضا توكلي، مهدي نيلي احمد آبادي
