A review and analysis on influence of temperature and concentration of nanofluids on thermophysical properties, heat transfer and pumping power

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• 作者：Ravikanth S. Vajjha ; Debendra K. Das ; ^{dkdas@alaska.edu}
• 关键词：Convective heat transfer ; Euler number ; Friction factor ; Mouromtseff number ; Nanofluids ; Nusselt number ; Prandtl number ; Reynolds number ; Thermal diffusivity ; Thermophysical properties
• 刊名：International Journal of Heat and Mass Transfer
• 出版年：2012
• 出版时间：July, 2012
• 年：2012
• 卷：55
• 期：15-16
• 页码：4063-4078
• 全文大小：688 K

文摘

The Prandtl number, Reynolds number and Nusselt number are functions of thermophysical properties of nanofluids and these numbers strongly influence the convective heat transfer coefficient. The pressure loss and the required pumping power for a given amount of heat transfer depend on the Reynolds number of flow. The thermophysical properties vary with temperature and volumetric concentration of nanofluids. Therefore, a comprehensive analysis has been performed to evaluate the effects on the performance of nanofluids due to variations of density, specific heat, thermal conductivity and viscosity, which are functions of nanoparticle volume concentration and temperature. Two metallic oxides, aluminum oxide (Al₂O₃), copper oxide (CuO) and one nonmetallic oxide silicon dioxide (SiO₂), dispersed in an ethylene glycol and water mixture (60:40 by weight) as the base fluid have been studied.