Browse > Article
http://dx.doi.org/10.3795/KSME-B.2011.35.7.665

Boiling Heat Transfer Coefficients of Nanofluids Containing Carbon Nanotubes up to Critical Heat Fluxes  

Park, Ki-Jung (Dept. of Mechanical Engineering, Inha Univ.)
Lee, Yo-Han (Dept. of Mechanical Engineering, Inha Univ.)
Jung, Dong-Soo (Dept. of Mechanical Engineering, Inha Univ.)
Shim, Sang-Eun (Dept. of Chemical Engineering, Inha Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.35, no.7, 2011 , pp. 665-676 More about this Journal
Abstract
In this study, the nucleate pool boiling heat transfer coefficients (HTCs) and critical heat flux (CHF) for a smooth and square flat heater in a pool of pure water with and without carbon nanotubes (CNTs) dispersed at $60^{\circ}C$ were measured. Tested aqueous nanofluids were prepared using CNTs with volume concentrations of 0.0001%, 0.001%, and 0.01%. The CNTs were dispersed by chemically treating them with an acid in the absence of any polymers. The results showed that the pool boiling HTCs of the nanofluids are higher than those of pure water in the entire nucleate boiling regime. The acid-treated CNTs led to the deposition of a small amount of CNTs on the surface, and the CNTs themselves acted as heat-transfer-enhancing particles, owing to their very high thermal conductivity. There was a significant increase in the CHF- up to 150%-when compared to that of pure water containing CNTs with a volume concentration of 0.001%. This is attributed to the change in surface characteristics due to the deposition of a very thin layer of CNTs on the surface. This layer delays nucleate boiling and causes a reduction in the size of the large vapor canopy around the CHF. This results in a significant increase in the CHF.
Keywords
Nucleate Pool Boiling; Nanofluids; Carbon Nanotubes; Critical Heat Flux; Heat Transfer Coefficients;
Citations & Related Records

Times Cited By SCOPUS : 0
연도 인용수 순위
  • Reference
1 Park, K. J. and Jung, D., 2007, "Enhancement of Nucleate Boiling Heat Transfer Using Carbon Nanotubes," International Journal of Heat and Mass Transfer, Vol. 50, pp. 4499-4502.   DOI   ScienceOn
2 Park, K. J., Jung, D. and Shim, S. E., 2009, "Nucleate Boiling Heat Transfer in Aqueous Solutions with Carbon Nanotubes up to Critical Heat Fluxes," International Journal of Multiphase Flow, Vol. 35, No. 6, pp. 525-532.   DOI   ScienceOn
3 Ajayan, P. M., 1999, "Nanotubes from Carbon," Chemical Reviews, Vol. 99, pp. 1787-1799.   DOI   ScienceOn
4 Dresselhaus, M. S., Dresselhaus, G. and Avouris, P., 2001, "Carbon Nanotubes: Synthesis, Structure, Properties and Applications," Eds.; Springer, New York, Vol. 80.
5 Baughman, R. H., Zakhidov, A. A. and de Heer, W. A., 2002, "Carbon Nanotubes - the Route Toward Applications," Science, Vol. 297, p. 787.   DOI   ScienceOn
6 Riggs, J. E., Guo, Z., Carroll, D. L. and Sun, Y. P., 2000, "Strong Luminescence of Solubilized Carbon Nanotubes," Journal of the American Chemical Society, Vol. 122, No. 24, pp. 5879-5880.   DOI   ScienceOn
7 Ha, J. U., Kim, M., Lee, J., Choe, S., Cheong, I. W. and Shim, S. E., 2006, "A Novel Synthesis of Polymer Brush on Multiwall Carbon Nanotubes Bearing Terminal Monomeric Unit," Journal of Polymer Science: Part A: Polymer Chemistry, Vol. 44, pp. 6394-6401.   DOI   ScienceOn
8 Georgakilas, V., Kordatos, K., Prato, M., Guldi, D. M., Holzinger, M. and Hirsch, A., 2002, "Organic Functionalization of Carbon Nanotubes," Journal of the American Chemical Society, Vol. 124, No. 5, pp. 760-761.   DOI   ScienceOn
9 Kline, S. J. and McClintock, F. A., 1953, "Describing Uncertainties in Single-Sample Experiments," Mechanical Engineer, Vol. 75, pp 3-8.
10 Eastman, J. A., Choi, S. U. S. and Yu, W., 2001, "Anomalously Increased Effective Thermal Conductivity of Ethylene Glycol-based Nanofluids Containing Copper Nanoparticles," Applied Physic Letters, Vol. 78, pp. 718-720.   DOI   ScienceOn
11 Das, S. K., Putra, N., Thiesem, P. and Roetzel, W., 2003, "Temperature Dependence of Thermal Conductivity Enhancement for Nanofluids," ASME Journal of Heat Transfer, Vol. 125, pp. 567-574.   DOI   ScienceOn
12 You, S. M., Kim, J. H. and Kim, K. H., 2003, "Effect of Nanoparticles on Critical Heat Flux of Water in Pool Boiling Heat Transfer," Applied Physic Letters, Vol. 83, pp. 3374-3376.   DOI   ScienceOn
13 Bang, I. C. and Chang, S. H., 2005, "Boiling Heat Transfer Performance and Phenomena of $Al_2O_3$-water Nano Fluids from a Plain Surface in a Pool," International Journal of Heat and Mass Transfer, Vol. 48, pp. 2407-2419.   DOI   ScienceOn
14 Kim, S. J., Bang, I. C., Buongiorno, J. and Hu, L. W., 2007, "Surface Wettability Change during Pool Boiling of Nanofluids and its Effect on Critical Heat Flux," International Journal of Heat and Mass Transfer, Vol. 50, pp. 4105-4116.   DOI   ScienceOn
15 Coursey, J. S. and Kim, J., 2008, "Nanofluid Boiling: The Effect of Surface Wettability," International Journal of Heat and Fluid Flow, Vol. 29, No. 6, pp. 1577-1585.   DOI   ScienceOn
16 Kim, H. D., Kim, J. and Kim, M. H., 2007, "Experimental Studies on CHF Characteristics of Nano-fluids at Pool Boiling," International Journal of Multiphase Flow, Vol. 33, pp. 691-706.   DOI   ScienceOn
17 Lee, S., Choi, S. U. S., Li, S. and Eastman, J. A., 1999, "Measuring Thermal Conductivity of Fluids Containing Oxide Nanoparticles," ASME Journal of Heat Transfer, Vol. 121, pp. 280-289.   DOI
18 Xue, H. S., Fan, J. R., Hong, R. H. and Hu, Y. C., 2007, "Characteristic Boiling Curve of Carbon Nanotube Nanofluid as Determined by the Transient Calorimeter Technique," Applied Physics Letters, Vol. 90, 184107.   DOI   ScienceOn
19 Eastman, J. A., Choi, S. U. S., Li, S., Thompson, L. J. and Lee, S., 1997, "Enhanced Thermal Conductivity Through the Development of Nano-Fluids," Proc., Symposium on Nanophase and Nanocomposite materials II, Materials Research Society, Boston, Vol. 457, pp. 3-11.