8603

7984

كارشناسي ارشد

پديده هاي انتقال

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي

1392

پانزده،79ص.: مصور،جدول،نمودار(رنگي)

ص.ع.به فارسي و انگليسي

مسعود حق شناس فرد، غلامرضا اعتماد

18/12/92

ارجمند مهرباني، محسن نصر اصفهاني

مهندسي شيمي

ID7984

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Numerical Analysis of Pool Boiling Heat Transfer of Nanofluids Hosein Sadegharani H sadegharani@ce iut ac ir Department of chemical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M sc Language FarsiSupervisor Masoud Haghshenasfard haghshenas@cc iut ac irAbstractPool boiling is one of the most common methods used in industries due to its high extentrate of heat transfer Therefore it is necessary to predict the pool boiling heat transfer rate In recent years most efforts have focused on measuring and simulating the boiling process In this study pool boiling of nanofluids is investigated numerically Important parameterssuch as heat transfer rate critical heat flux heat transfer coefficient boiling curves ofnanofluids and operating pressure on pool boiling are determined Simulations performedusing Fluent 14 and the desired geometry was gained through Ansys Design Modeler Initially simulations carried out with water and nanofluid of aluminum oxide with of 2 and0 8 wt concentrations and the simulation results compared with the experimental data Then simulations repeated with the previous geometry of titanium oxide nanofluids withconcentrations of 2 and 0 8 wt to investigate the effect of nanoparticles on the boilingcurve and boiling heat transfer coefficient The simulation results showed that the additionof aluminum oxide nanoparticles increases the heat flux and heat transfer coefficient Furthermore enhancement of the aluminum oxide nanofluid concentration from 0 8 wt to 2 wt increases the rate of transfer coefficient with average of 10 The simulationcarried out at pressures of 84 55 101 3 and 120 8 KPa for nanofluids of aluminum oxide2 wt and the results showed that the pressure increase decreases in excess temperature ata constant heat flux and also more heat transfers when the rate of heat at the surface islower In order to evaluate the critical heat flux simulations performed with aluminumoxide nanofluids and it was observed that enhancement of the concentration ofnanoparticles increases the critical heat flux In case of using alumina nanofluids withconcentration of 2 wt the critical heat flux increase up to 11 3 in camparison with thepure water Keywords Pool Boiling Nanofluid Boiling Curve Computational Fluid Dynamics

مسعود حق شناس فرد، غلامرضا اعتماد

ارجمند مهرباني، محسن نصر اصفهاني