Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
권호 표지
DOI QR코드

DOI QR Code

Study on the Thermal Conductivity and Viscosity of Ethanol with Carbon Nanotubes for the Development of a Heat Pipe Working Fluid

히트파이프 작동유체 개발을 위한 에탄올-탄소나노튜브 나노유체의 열전도도 및 점도 특성 연구

  • 안응진 (제주대학교 대학원 에너지화학공학전공) ;
  • 박성식 (제주대학교 대학원 에너지화학공학전공) ;
  • 박윤철 (제주대학교 기계공학과) ;
  • 김종윤 (서정대학교 소방안전관리과) ;
  • 김남진 (제주대학교 에너지공학과)
  • Received : 2012.03.06
  • Accepted : 2012.07.02
  • Published : 2012.08.30
Download PDF
⟨ Previous Next ⟩

Abstract

Nanofluids using Carbon Nanotubes have a excellent thermal characteristic. In this study, for increasing the efficiency of solar collector, the thermal conductivity and viscosity of Ethanol-Oxidized Multi-walled Carbon Nanofluids were measured. Nanofluids were manufactured by ultra-sonic dispersing Oxidized Multi-walled Carbon Nanotubes(OMWCNTs) in ethanol at the rates of 0.0005 ~ 0.1 vol%. The thermal conductivity and viscosity of manufactured nanofluids were measured at the low temperature($10^{\circ}C$), the room temperature($25^{\circ}C$) and the high temperature($70^{\circ}C$). For measuring thermal conductivity and viscosity, we used transient hot-wire method and rotational digital viscometer, respectively. As a result, under given temperature conditions, thermal conductivity of the 0.1 vol% nanofluids improved 33.74% ($10^{\circ}C$), 33.14% ($25^{\circ}C$) and 32.36% ($70^{\circ}C$), and its viscosity increased by 37.93% ($10^{\circ}C$), 31.92% ($25^{\circ}C$) and 29.42% ($70^{\circ}C$) than the base fluids.

Keywords

References

  1. International Energy Agency, Key World Energy STATISTICS, 2010
  2. Jung E.G., Boo J.H., Performance Characteristics of a Heat Pope Having Water-Ethanol Mixtureas Working fluid for Evacuated Solar Collectors, Journal of the Korean Solar Energy Society, 2006, Vol. 28, No. 5, pp.78-84
  3. Ha H. J., Kong Y. C., Do K. H., Jang S.P., Experimental Investigation on Thermal Characteristics of Heat Pipes Using Water-based MWCNT Nanofluids. Korean Journal of Air-Conditioning and Refrigeration Engineering, 2011, Vol. 23, No. 7, pp. 528-534. https://doi.org/10.6110/KJACR.2011.23.7.528
  4. Liu, M. S.,Lin, M. C., Huang, I. Te., Wang, C. C., Enhancement of thermal conductivity with carbon nanotube for nanofluids, International Communications in Heatand Mass Transfer, 2005, Vol. 32. No. 9, pp. 1202-1210. https://doi.org/10.1016/j.icheatmasstransfer.2005.05.005
  5. Choi. S. U. S., Zhang. Z. G., Yu. W., Lockwood F. E., Crylke, E, A., Anomalous thermal conductivity enhancement in annotube suspension, Appl. Phys. Lett., 2001, Vol. 79, No. 14, pp. 2252-2254. https://doi.org/10.1063/1.1408272
  6. Xie, H., Lee, H., Youn, W., and Choi, M., 2003, Nanofluids containing multiwalled carbon nanotubes and their enhanced thermal conductivities, Journal of Applied Physics, 2003, Vol. 94, No. 8, pp.4967-4971. https://doi.org/10.1063/1.1613374
  7. Kim J.H., Hwang K.S., Kong Y.C., Jang S.P., Experimental investigation on thermal characteristics of miniature heat pipes using water-based $Al_{2}O_{3}$ nanofluids, 2008 Journal of the Korean Society of mechanical Engineering Spring Conference 2008, 2008, pp. 310-313.
  8. Kim N. J., Park S. S., Lim S. H., Chun W. G., A study on the characteristics of Carbon nanofluids at the room temperature (25${^{\circ}C}$), International Communiocations in Heat and Mass Transfer, 2011, Vol. 38 No. 3, pp. 313-318. https://doi.org/10.1016/j.icheatmasstransfer.2010.11.002
  9. Bently, J. P., Temperature sensor characteristics and measurement system design, Journal of Physics E: Scientific Instruments, 1984, Vol.17, pp. 430-435 https://doi.org/10.1088/0022-3735/17/6/002
  10. Nagasaka,Y.and Nagashima, A., Absolute Measurement of the thermal conductivity of electrically conducting liquids by the transient hot-wire method, Journal of Physics E: Scientific Instruments, 1981, Vol.14, pp. 1435-1440 https://doi.org/10.1088/0022-3735/14/12/020
  11. Chemical Engineering Research Information Center http://www.cheric.org/research/kdb/hcprop/showcef.php?cmpid=818&prop=THL
  12. Kyu Hyung Do, Seok Pil Jang, effect of nanofluids on the thermal performance of a flat micro heat pipe with a rectangular grooved wick, International Journal of Heat and Mass Transfer, 2010, Vol. 53, Issues 9-10, pp. 2183-2192. https://doi.org/10.1016/j.ijheatmasstransfer.2009.12.020