期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2016
卷号：5
期号：12
页码：20913
DOI：10.15680/IJIRSET.2016.0512134
出版社：S&S Publications
摘要：Fluids are used for heat transfer in many engineering equipment. Water, ethylene glycol and propyleneglycol are some of the common heat transfer fluids. Over the years, various techniques have been employed to improvethe heat transfer rate of these fluids. Addition of milli or micro sized particles to the heat transfer fluid is one of theways of improving heat transfer rate. Though this looks simple, this method has practical problems such as highpressure loss, clogging and erosion of the material of construction. These problems can be overcome by usingnanofluids, which is a dispersion of nanosized particles in a base fluid. Nanoparticles increase the thermalconductivity of the base fluid manifold which in turn increases the heat transfer rate.In this study, the flow field and heat transfer behaviour of Al2O3-H2O, Cu2O- H2O & TiO2-H2O nanofluids atturbulent flow in a tube are investigated. Simulations are carried out for Reynolds numbers from 20000, 40000 to100000 at 0.01 volume fraction. The finite volume based CFD technique is used to solve the governing equationsnumerically. The numerical results showed that with increasing Reynolds number average Nusselt number increases forgiven volume fraction for all nanofluids. The average nusselt number is more in TiO2-H2O nanofluids compared toAl2O3-H2O& Cu2O- H2O nanofluids. The thermal conductivity increases with increasing Reynolds number and is morein Al2O3-H2O nanofluids compared to Cu2O- H2O &TiO2-H2O nanofluids. The pressure drop increases with enhancingthe Reynolds number for given volume fraction. The convective heat transfer coefficient increases with increasingReynolds number and most increment is absorbed in TiO2-H2O nanofluid.
关键词：Nanofluids; Turbulent flow; Forced convection; Numerical solution; Pressure drop
