Thermal conductivity and viscosity models of metallic oxides nanofluids. (January 2018)

• Record Type: Journal Article
• Authors: Alawi, Omer A.; Sidik, Nor Azwadi Che; Xian, Hong Wei; Kean, Tung Hao; Kazi, S.N.
• Is Part Of: International journal of heat and mass transfer. Volume 116(2018)
• Page Start: 1314
• Page End: 1325
• Publication Date: 2018-01
• Subjects: Metallic oxides nanofluids -- Thermal conductivity -- Dynamic viscosity -- Nanoparticles shape; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2017.09.133
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Thermal conductivity and viscosity models of nanofluids were reviewed. Metallic oxides nanofluids (Al2 O3, CuO, SiO2 and ZnO) were considered. Various shapes of nanoparticles were selected. Thermal conductivity increased as temperature and concentration increased. Nanoparticles shape has sufficient impact on thermophysical properties of nanofluids. Abstract: For over ten years, investigators focused on determining and modelling the effective thermal conductivity and viscosity of nanofluids. Lately, many theoretical and experimental investigations on convective heat transfer have been performed on the augmentation of heat transfer by utilizing suspensions of nanometer-sized solid particle materials (metallic or nonmetallic) in base fluids. The main purpose of this work is to determine the thermal conductivity and viscosity of various types of metallic oxides (Al2 O3, CuO, SiO2 and ZnO) for nanoparticle concentrations of 1–5 vol% at temperatures of 300–320 K and nanoparticle shapes (blades, platelets, cylindrical, bricks, and spherical). The results illustrate that the effective thermal conductivity and thermal conductivity ratio of metallic oxide nanofluids increase with temperature and nanoparticles volume fraction but decreases nanoparticle size intensifies. Besides that, the results of effective viscosity and viscosity ratio obtained indicate a considerable rise with the increase of nanoparticles concentration. Thus, optimum nanoparticle concentration is essential to be determined in forming nanofluids that can enhance thermal systems performance. Finally, it is found that nanoparticles shape has great impact on the thermophysical properties of nanofluids.