DOI QR코드

DOI QR Code

A Study on the Relationship between Surface Condition and Critical Heat Flux in Heat Exchanger

열교환기 표면상태와 CHF의 상관관계에 대한 연구

  • Kim, Woo-Joong (Department of Nuclear & Energy Engineering, Jeju National University) ;
  • Kim, Nam-Jin (Department of Nuclear & Energy Engineering, Jeju National University)
  • 김우중 (제주대학교 에너지공학과) ;
  • 김남진 (제주대학교 에너지공학과)
  • Received : 2020.05.11
  • Accepted : 2020.05.25
  • Published : 2020.06.01

Abstract

This work experimentally explored the influence of nano-fouling on CHF, flow boiling heat transfer coefficient, contact angle, and surface roughness. In this study, the flow velocity conditions are established at 0.5, 1.0, and 1.5 m/s. Also, the nanoparticles of oxidized MWCNT were deposited on a heat transfer surface for 0, 120, 180, and 240 sec. As the results, it was found that CHF and superheated temperature were increased in case of nano fouling on the heat transfer surface in oxidized MWCNT fluid. Also, the contact angle and surface roughness decreased when flow velocity and nano coating increased.

Keywords

References

  1. Peng, H., Ding, G., Jiang, W., and Gao, Y., 2009, Heat transfer characteristics of refrigerant-based nanofluid flow boiling inside a horizontal smooth tube, International Journal of Refrigeration, Vol. 32, No. 6, pp. 1259-1270. https://doi.org/10.1016/j.ijrefrig.2009.01.025
  2. Henderson, K., Park, Y. G., Liu, L., and Jacobi, A. M., 2010, Flow-boiling heat transfer of R-134a-based nanofluids in a horizontal tube, Int. J. Heat and Mass Transfer, Vol. 53, No. 5-6, pp. 944-951. https://doi.org/10.1016/j.ijheatmasstransfer.2009.11.026
  3. Kim, S. J., Bang, I. C., and Buongiorno, J., 2007, Surface wettability change during pool boiling of nanofluids and its effect on critical heat flux, Int. J. Heat and Mass Transfer, Vol. 50, 4105-4116. https://doi.org/10.1016/j.ijheatmasstransfer.2007.02.002
  4. Shahmoradi, Z., Etesami, N., and Esfahany, M. N., 2013, Pool boiling characteristics of nanofluid on flat plate based on heater surface analysis, Int. J. Heat and Mass Transfer, Vol. 47, pp. 113-120. https://doi.org/10.1016/j.icheatmasstransfer.2013.06.006
  5. Taylor, R. A. and Phelan, P. E., 2009, Pool boiling of nanofluids : Comprehensive review of existing data and limited new data, Int. J. Heat and Mass Transfer, Vol. 52, pp. 5339-5347. https://doi.org/10.1016/j.ijheatmasstransfer.2009.06.040
  6. Salari, E., Mohsen, S., Sarafraz, P. M. M., and Hormosi, F., 2016, Boiling Thermal Performance of $TiO_2$ Aqueous NanoFluids as a Coolant on a Disc Copper Block, Period. Polytech. Chem. Eng., Vol. 60, No. 2, pp. 106-122.
  7. Jeon, Y. H., Kim, Y. H., and Kim, N. J., 2017, A study on the heat transfer and durability of carbon nano coating for the safety improvement of a pool boiling system, J. Korea Saf. Manag. Sci., Vol. 19, No. 1, pp. 211-217. https://doi.org/10.12812/ksms.2017.19.1.211
  8. Kim, T. I., Chang, W. J., and Chang, W. S., 2011, Flow boiling CHF enhancement using $Al_2O_3$ nanofluid and an $Al_2O_3$ nanoparticle deposited tube, Int. J. of Heat and Mass Transfer, Vol. 54, pp. 2021-2025. https://doi.org/10.1016/j.ijheatmasstransfer.2010.12.029
  9. Zuber, N., 1958, On stability of boiling heat transfer, ASME transactions, Vol. 80, pp. 711-714.
  10. Katto, Y. and Kurata, C., 1980, Critical heat flux of saturated convective boiling on uniformly heated plates in a parallel flow, Int. J. of Multiplhase Flow, Vol. 6, No. 6, pp. 575-582. https://doi.org/10.1016/0301-9322(80)90052-X