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90plus 納米粒度儀應(yīng)用案例-23
閱讀：936 發(fā)布時(shí)間：2014-4-8文獻(xiàn)名：Particle size and interfacial effects on thermo-physical and heat transfer characteristics of water-based α-SiC nanofluids
作者：Elena V Timofeeva1, David S Smith1, Wenhua Yu1, David M France2, Dileep Singh3 and Jules L Routbort1
1 Energy Systems Division, Argonne National Laboratory, Argonne, IL 60439, USA
2 Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 West Taylor Street (m/c 251) Chicago, IL 60607-7022, USA
3 Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
摘要：The effect of average particle sizes on basic macroscopic properties and heat transfer performance of α-SiC/water nanofluids was investigated. The average particle sizes, calculated from the specific surface area of nanoparticles, were varied from 16 to 90 nm. Nanofluids with larger particles of the same material and volume concentration provide higher thermal conductivity and lower viscosity increases than those with smaller particles because of the smaller solid/liquid interfacial area of larger particles. It was also demonstrated that the viscosity of water-based nanofluids can be significantly decreased by pH of the suspension independently from the thermal conductivity. Heat transfer coefficients were measured and compared to the performance of base fluids as well as to nanofluids reported in the literature. Criteria for evaluation of the heat transfer performance of nanofluids are discussed and optimum directions in nanofluid development are suggested.