11730

10762

كارشناسي ارشد

تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1395

چهارده،[140]ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمدرضا سليم پور

ابراهيم شيراني

احمد صابونچي، محمدرضا توكلي

1395/08/18

كتابنامه

مهندسي مكانيك

ID10762

Numerical Simulation of Heat Transfer of NanoFluids inside a Sinusoidal PipeHeat Exchanger to Achieve Optimum Condition Maryam Rezaee M Rezaee 87@yahoo com Date of Submission 2016 02 20 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Mohammad Reza Salimpour Salimpour@cc iut ac irAbstractIn recent years some technologies have been developed to increase heat transfer and decrease sizein heat exchangers due to insufficient heat transfer coefficients and high dimensions or costs inthem These technologies have been used widely in chemical and refrigeration industries coolingprocess cells etc Recently and contemporaneous with emersion of nano technologies usingsuspensions of fluids base containing nanoparticles solid particles with nano dimensions have hadconsiderable growth to enhance heat transfer in the heat exchangers This method has shown thatusing solid nano particles into fluids leads to enhanced heat transfer or changed other properties ofbase fluids However earlier increasing heat transfer has been made by change in heat exchangerparameters such as geometries boundary conditions fluid type and etc Also in addition to usingnano fluids one can use other methods under research to optimize heat exchanger performance One of these methods is using sinusoidal pipes in flow direction Thus appropriate to moderntechniques mentioned above in this thesis numerical simulation of heat transfer and flow pressuredrop of nanofluids in sinusoidal pipes were presented Furthermore to obtain an optimum case results of numerical simulation for common fluids and straight pipes must be compared withresults from flow of nanofluids in sinusoidal pipes with different geometris diameter or amplitudeto wave length ratio various combinations of base fluid and different size and volumetricconcentration of nano particles In present research 3D models were created in SolidWorkssoftware and simulations or numerical studies were done in Ansys Fluent commercial code fornanofluids including water and ethylene glycol water as base fluids with and nano particles through various straight and simmetric sinusoidal pipes with constant uniform heat fluxor constant temperature on the tube wall as thermal boundary condition Results show that usingnano particles in siusoidal pipe heat exchangers and increase of Reynolds number can affectsignificant enhancement in heat transfer level Notwithstanding to this disadvantages are also oftenrised up where the most important item in them is the pressure drop of fluid flow due to presenceof solid particles suspensed in the base fluid So optimization of volume fraction of these particlesis very important in this thesis same as geometry and type of fluid Keywords Nanofluid Sinusoidal tube Heat transfer Pressure drop Performance evaluation criteria PEC Constant heat flux Boundary Condition Constant Temperature Boundary Condition

محمدرضا سليم پور

ابراهيم شيراني

احمد صابونچي، محمدرضا توكلي