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Preparation and characterization of carbon nanofluid by a plasma arc nanoparticles synthesis system.

Teng TP, Cheng CM, Pai FY - Nanoscale Res Lett (2011)

Bottom Line: The particle size and shape were determined using the light-scattering size analyzer, SEM, and TEM.The thermal conductivity of carbon/water nanofluid increased by about 25% at 50°C compared to distilled water.The experimental results demonstrated excellent thermal conductivity and feasibility for manufacturing of carbon/water nanofluids.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Industrial Education, National Taiwan Normal University, No, 162, Sec, 1, He-ping E, Rd,, Da-an District, Taipei City 10610, Taiwan. tube5711@ntnu.edu.tw.

ABSTRACT
Heat dissipation from electrical appliances is a significant issue with contemporary electrical devices. One factor in the improvement of heat dissipation is the heat transfer performance of the working fluid. In this study, we used plasma arc technology to produce a nanofluid of carbon nanoparticles dispersed in distilled water. In a one-step synthesis, carbon was simultaneously heated and vaporized in the chamber, the carbon vapor and particles were then carried to a collector, where cooling furnished the desired carbon/water nanofluid. The particle size and shape were determined using the light-scattering size analyzer, SEM, and TEM. Crystal morphology was examined by XRD. Finally, the characterization include thermal conductivity, viscosity, density and electric conductivity were evaluated by suitable instruments under different temperatures. The thermal conductivity of carbon/water nanofluid increased by about 25% at 50°C compared to distilled water. The experimental results demonstrated excellent thermal conductivity and feasibility for manufacturing of carbon/water nanofluids.

No MeSH data available.


Related in: MedlinePlus

Dependence relationship between temperatures and thermal conductivity enhanced carbon/water nanofluid ratio under different fabrication parameters.
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Figure 11: Dependence relationship between temperatures and thermal conductivity enhanced carbon/water nanofluid ratio under different fabrication parameters.

Mentions: Figure 11 shows the change in thermal conductivity ratio for nanofluid compared to distilled water, over a temperature range of 20-50°C. The figure reveals that as the temperature increases, the effect of increasing nanoparticle concentration on the thermal conductivity ratio is greater than the applied temperature change. Increasing both concentration and temperature increases the frequency of particle liquid collisions producing a near quasi-convection phenomenon. Increasing random collision behavior helps to increase the thermal conductivity of carbon/water nanofluids, but there are some researchers who believe that the above-mentioned factors to increase the thermal conductivity were not significant [42,43]. For a concentration of 0.02 wt.% (NC-70) and a temperature in the range of 20-50°C, the ratio of thermal conductivity increases by 5.0-17.54%. For a concentration of 0.04 wt.% (NC-80), the ratio of thermal conductivity increases by 7.78-25.0% compared to distilled water.


Preparation and characterization of carbon nanofluid by a plasma arc nanoparticles synthesis system.

Teng TP, Cheng CM, Pai FY - Nanoscale Res Lett (2011)

Dependence relationship between temperatures and thermal conductivity enhanced carbon/water nanofluid ratio under different fabrication parameters.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211359&req=5

Figure 11: Dependence relationship between temperatures and thermal conductivity enhanced carbon/water nanofluid ratio under different fabrication parameters.
Mentions: Figure 11 shows the change in thermal conductivity ratio for nanofluid compared to distilled water, over a temperature range of 20-50°C. The figure reveals that as the temperature increases, the effect of increasing nanoparticle concentration on the thermal conductivity ratio is greater than the applied temperature change. Increasing both concentration and temperature increases the frequency of particle liquid collisions producing a near quasi-convection phenomenon. Increasing random collision behavior helps to increase the thermal conductivity of carbon/water nanofluids, but there are some researchers who believe that the above-mentioned factors to increase the thermal conductivity were not significant [42,43]. For a concentration of 0.02 wt.% (NC-70) and a temperature in the range of 20-50°C, the ratio of thermal conductivity increases by 5.0-17.54%. For a concentration of 0.04 wt.% (NC-80), the ratio of thermal conductivity increases by 7.78-25.0% compared to distilled water.

Bottom Line: The particle size and shape were determined using the light-scattering size analyzer, SEM, and TEM.The thermal conductivity of carbon/water nanofluid increased by about 25% at 50°C compared to distilled water.The experimental results demonstrated excellent thermal conductivity and feasibility for manufacturing of carbon/water nanofluids.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Industrial Education, National Taiwan Normal University, No, 162, Sec, 1, He-ping E, Rd,, Da-an District, Taipei City 10610, Taiwan. tube5711@ntnu.edu.tw.

ABSTRACT
Heat dissipation from electrical appliances is a significant issue with contemporary electrical devices. One factor in the improvement of heat dissipation is the heat transfer performance of the working fluid. In this study, we used plasma arc technology to produce a nanofluid of carbon nanoparticles dispersed in distilled water. In a one-step synthesis, carbon was simultaneously heated and vaporized in the chamber, the carbon vapor and particles were then carried to a collector, where cooling furnished the desired carbon/water nanofluid. The particle size and shape were determined using the light-scattering size analyzer, SEM, and TEM. Crystal morphology was examined by XRD. Finally, the characterization include thermal conductivity, viscosity, density and electric conductivity were evaluated by suitable instruments under different temperatures. The thermal conductivity of carbon/water nanofluid increased by about 25% at 50°C compared to distilled water. The experimental results demonstrated excellent thermal conductivity and feasibility for manufacturing of carbon/water nanofluids.

No MeSH data available.


Related in: MedlinePlus