Study on the Oxidation Treatment of Nanoparticles for the Critical Heat Flux
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Pool boiling, one of the key thermal-hydraulics phenomena, has been widely studied for improving heat transfer efficiencies and safety of nuclear power plants, refrigerating systems, solar-collector heat pipes, and other facilities and equipments. In the present study, the critical heat flux (CHF) and heat-transfer coefficients were tested under the pool-boiling state using graphene M-5 and M-15 nanofluids as well as oxidized graphene M-5 nanofluid. The results showed that the highest CHF increase for both graphene M-5 and M-15 was at the 0.01% volume fraction and, moreover, that the CHF-increase ratio for small-diameter graphene M-5 was higher than that for large-diameter graphene M-15. Also at the 0.01% volume fraction, the oxidized graphene M-5 nanofluid showed a 41.82%-higher CHF-increase ratio and a 26.7%-higher heat-transfer coefficient relative to the same nanofluid without oxidation treatment at the excess temperature where the CHF of distilled water occurs.
Abstract
Pool boiling, one of the key thermal-hydraulics phenomena, has been widely studied for improving heat transfer efficiencies and safety of nuclear power plants, refrigerating systems, solar-collector heat pipes, and other facilities and equipments. In the present study, the critical heat flux (CHF) and heat-transfer coefficients were tested under the pool-boiling state using graphene M-5 and M-15 nanofluids as well as oxidized graphene M-5 nanofluid. The results showed that the highest CHF increase for both graphene M-5 and M-15 was at the 0.01% volume fraction and, moreover, that the CHF-increase ratio for small-diameter graphene M-5 was higher than that for large-diameter graphene M-15. Also at the 0.01% volume fraction, the oxidized graphene M-5 nanofluid showed a 41.82%-higher CHF-increase ratio and a 26.7%-higher heat-transfer coefficient relative to the same nanofluid without oxidation treatment at the excess temperature where the CHF of distilled water occurs.
참고문헌 (16)
- Park, S. S, "Critical Heat Flux Enhancement in Pool-boiling Heat Transfer Using Oxidized Multi-wall Carbon Nanotubes", International Journal of Energy Research, 39(10), pp.1391~1401 (2015)
- Choi, S. U. S, "Enhancing Thermal Conductivity of Fluids with Nanoparticles, Developments and Applications of Nano Newtonian Flows", The American Society of Mechanical Engineers, 231, pp.99~105 (1995)
- Bang, I. C, "Boiling Heat Transfer Performance and Phenomena of Al2O3-water Nanofluids from a Plain Surface in a Pool", International Journal of Heat and Mass Transfer, 48, pp.2407~2419 (2005)
- Park, K. J., "Nucleate Boiling Heat Transfer in Aqueous Solutions with Carbon Nanotubes Up to Critical Heat Fluxes", International Journal of Multiphase Flow, 35, pp.2593~2602 (2009)
- Liu, Z. H, "Sorption and Agglutination Phenomenon of Nanofluids on a Plain Heating Surface During Pool Boiling", International Journal of Heat and Mass Transfer, 51, pp.2593~2602 (2008)
- Golubovic, M. N., "Nanofluids and Critical Heat Flux, Experimental and Analytical Study", Applied Thermal Engineering, 29, pp.1281~1288 (2009)
- Golubovic, M. N., "Nanofluids and Critical Heat Flux, Experimental and Analytical Study", Applied Thermal Engineering, 29, pp.1281~1288 (2009)
- Phan, H. T., "Surface Wettability Control by Nanocoating:The Effects on Pool Boiling heat Transfer and Nucleation Mechanism", International Journal of Heat and Mass Transfer, 52, pp.5459~5471 (2009)
- Soltani, S., "Pool boiling heat transfer of non-newtonian nanofluids", International Communications in Heat and Mass Transfer, 37, pp.29~33 (2010)
- Truong, B., "Modification of Sandblasted Plate Heaters Using Nanofluids to Enhance Pool Boiling Critical Heat Flux", International Journal of Heat and Mass Transfer, 53, pp.85~94 (2010)
- Ahn, H. S., "Pool Boiling CHF Enhancement by Micro", nanoscale Modification of Zircaloy-4 Surface, 2010, pp.240, 3350~3360
- Ahn, H. S., "Experimental Study of the Effect of a Reduced Graphene Oxide Coating on Critical Heat Flux Enhancement", International Journal of Heat and Mass Transfer, 60, pp.763~771 (2013)
- Phan, H. T., "Surface Wettability Control by Nanocoating:The Effects on Pool Boiling Heat Transfer and Nucleation Mechanism", International Journal of Heat and Mass Transfer, 52, pp.5459~5471 (2013)
- Yu, W., "Significant Thermal Conductivity Enhancement for Nanofluids Containing Graphene Nanosheets", Physics Letters, 375, pp.1323~ (2011)
- Malayeri, M. R., "Application of Nano-modified Surfaces for Fouling Mitigation", International Journal of Energy Research, 33(13), pp.1101~1113 (2009)
- Kline, S. J, "Describing Uncertainties in Single-sample Experiment", Mechanical Engineer, 75, pp.3~8 (1953)