توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Thermodynamic optimization of water–Al2O3 nanofluid flows through a helical pipe in laminar regime
اطلاعات انتشار: چهاردهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۸
Nanofluids, i.e. fluid suspensions of nanometer–sized solid particles are the new generation of heat transfer fluids for various industrial applications because of their excellent thermal performance.This study analytically examines the effects of adding nanoparticles on the entropy generation ofwater–Al2O3 nanofluid flows through a helical pipe under constant wall heat flux thermalboundary condition in laminar regime. It is found that adding nanoparticles improves the thermalperformance of water–Al2O3 flow with Re numbers less than 6000. Also it is shown that adding nanoparticles leads to increased entropy generation in the cases that fluid flow (pressure drop)irreversibility is dominant. The Dean number and radius ratio in which the entropy generation isminimum, decreases by increasing nanoparticles volume concentration from about 3175 and 14.5for pure water to 2965 and 5.3 for 5 Vol% Al2O3 nanoparticles in the based fluid of water respectively. Moreover optimum conditions of radius ratio and Dean Number for laminar nanofluid flow are obtained.<\div>

۲Experimental studies on the heat transfer of Al–metal \water nanofluid system in a spiral tube
اطلاعات انتشار: چهاردهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۵
In this present investigation Al–metal\water nanofluid in different concentrations produced and the laminar flow convective heat transfer through spiral coil tube with constant temperature boundarycondition were examined. This study employed direct synthesis method to prepare Al\waternanofluid to serve as working fluid in test section. Result demonstrates Al\water nanofluid increase approximately 40% Nusselt number compared with base fluid. Furthermore the induced centrifugal force in the spiral coil tube has significant effect on the enhancement of the heat transfer<\div>

۳experimental investigation of viscosity of Cu–oil nanofluids
اطلاعات انتشار: چهاردهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۸
in this study experimental results of CU–oil nano fluids viscosity were investigated nanofluids viscosity changes as function of temperature and volume fraction have been measured the result show that nanofluids viscosity increase with increasing volume fraction and exponentially decrease with increasing temperature some classical model were not able to predict the experimental results of visocositys changes but the new model that was offered by masoumi et al. considers brownian motin which has a good agreement by experimental results nanofluids viscosity changes with temperature have good agreement with namburus experimental model.<\div>

۴Investigation on Effect of Particle Size and Base Fluid on Thermal Conductivity Enhancement of SiO2Nanofluids
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۱۱
Nanofluids are fluids with suspended nanoparticles (with diameter less than 100nm) in them.These fluids have demonstrated grate potentials for heat transfer enhancement. In this study the thermal conductivity of SiO2 nanofluids has been studied according to the type of base fluid, size of nanoparticles and volumetric concentration and experimental results are compared to classic and novel models of nanofluids thermal conductivity. Results show that increase in concentration, decrease in diameter of nanoparticles and base fluid thermal conductivity of base fluid have noticeable effect on enhancementof thermal conductivity.<\div>
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