tailieunhanh - báo cáo hóa học: " Al2O3-based nanofluids: a review"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Al2O3-based nanofluids: a review | Sridhara and Satapathy Nanoscale Research Letters 2011 6 456 http content 6 1 456 o Nanoscale Research Letters a SpringerOpen Journal NANO REVIEW Open Access Al2O3-based nanofluids a review Veeranna Sridhara1 and Lakshmi Narayan Satapathy2 Abstract Ultrahigh performance cooling is one of the important needs of many industries. However low thermal conductivity is a primary limitation in developing energy-efficient heat transfer fluids that are required for cooling purposes. Nanofluids are engineered by suspending nanoparticles with average sizes below 100 nm in heat transfer fluids such as water oil diesel ethylene glycol etc. Innovative heat transfer fluids are produced by suspending metallic or nonmetallic nanometer-sized solid particles. Experiments have shown that nanofluids have substantial higher thermal conductivities compared to the base fluids. These suspended nanoparticles can change the transport and thermal properties of the base fluid. As can be seen from the literature extensive research has been carried out in alumina-water and CuO-water systems besides few reports in Cu-water- TiO2- zirconia- diamond- SiC- Fe3O4- Ag- Au- and CNT-based systems. The aim of this review is to summarize recent developments in research on the stability of nanofluids enhancement of thermal conductivities viscosity and heat transfer characteristics of alumina Al2O3 -based nanofluids. The Al2O3 nanoparticles varied in the range of 13 to 302 nm to prepare nanofluids and the observed enhancement in the thermal conductivity is 2 to 36 . Introduction Conventional fluids such as water engine oil and ethylene glycol are normally used as heat transfer fluids. Although various techniques are applied to enhance the heat transfer the low heat transfer performance of these conventional fluids obstructs the performance enhancement and the compactness of heat exchangers. The use of solid particles as an additive suspended into the base fluid is technique for the .

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