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Al2O3-based nanofluids: a review.

Sridhara V, Satapathy LN - Nanoscale Res Lett (2011)

Bottom Line: 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 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%.

View Article: PubMed Central - HTML - PubMed

Affiliation: Ceramic Technological Institute, BHEL, Malleswaram Complex, Bangalore 560012, India. satpathy@bhelepd.com.

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%.

No MeSH data available.


Related in: MedlinePlus

Effect of preparation techniques on thermal conductivity of Al2O3-based nanofluids. High-speed disperser [15], mixing chamber [1], ultrasonic vibrator [7], blender-ultrasonic bath [8], mixing-ultrasonication [16].
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Figure 5: Effect of preparation techniques on thermal conductivity of Al2O3-based nanofluids. High-speed disperser [15], mixing chamber [1], ultrasonic vibrator [7], blender-ultrasonic bath [8], mixing-ultrasonication [16].

Mentions: Figure 5 shows that the enhancement in the case of Xie et al. [16] is more compared to others even though they used lesser particles and in the case of Wang et al. [8] shows lesser enhancement at 2.5 vol.% compared to Das et al. [7] and Lee et al. [1]. The same method of synthesis in the latter two cases demonstrated similar enhancement ratios. These results demonstrate that a stable dispersion can be achieved by many different methods, but the thermal conductivity enhancement is dependent on the preparation methods. These results need further studies since the stability of such fluids in the long run has not been studied and the data reported here is immediately after obtaining the nanofluid.


Al2O3-based nanofluids: a review.

Sridhara V, Satapathy LN - Nanoscale Res Lett (2011)

Effect of preparation techniques on thermal conductivity of Al2O3-based nanofluids. High-speed disperser [15], mixing chamber [1], ultrasonic vibrator [7], blender-ultrasonic bath [8], mixing-ultrasonication [16].
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211876&req=5

Figure 5: Effect of preparation techniques on thermal conductivity of Al2O3-based nanofluids. High-speed disperser [15], mixing chamber [1], ultrasonic vibrator [7], blender-ultrasonic bath [8], mixing-ultrasonication [16].
Mentions: Figure 5 shows that the enhancement in the case of Xie et al. [16] is more compared to others even though they used lesser particles and in the case of Wang et al. [8] shows lesser enhancement at 2.5 vol.% compared to Das et al. [7] and Lee et al. [1]. The same method of synthesis in the latter two cases demonstrated similar enhancement ratios. These results demonstrate that a stable dispersion can be achieved by many different methods, but the thermal conductivity enhancement is dependent on the preparation methods. These results need further studies since the stability of such fluids in the long run has not been studied and the data reported here is immediately after obtaining the nanofluid.

Bottom Line: 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 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%.

View Article: PubMed Central - HTML - PubMed

Affiliation: Ceramic Technological Institute, BHEL, Malleswaram Complex, Bangalore 560012, India. satpathy@bhelepd.com.

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%.

No MeSH data available.


Related in: MedlinePlus