대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제33권4호
  • /
  • Pages.235-241
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  • 2009
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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나노유체 토로이달 자연대류 루프에서의 열전달 특성

Heat Transfer Characteristics on Toroidal Convection Loop with Nanofluids

  • 장주찬 (충북대학교 대학원 기계공학부) ;
  • 이석호 (충북대학교 기계공학부) ;
  • 이충구 (충북대학교 기계공학부)
  • 발행 : 2009.04.01
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초록

Experimental studies on single-phase toroidal circulation loop(thermosyphon) have been performed in the present study with Ag-nanofluids as a working fluids. The present paper deals with an experimental study on the heat transfer behavior of single-phase toroidal loop. Toroidal loop charged with nanofluid has been constructed and a number of tests have been carried out. Different geometric parameter, e.g., orientation has been investigated. The tests were conducted employing two fluids: distilled water and Ag-nanofluid of various volume concentrations. The experiments at Rayleigh number from $10^5$ to $10^6$ showed a systematic and slight deterioration in natural convective heat transfer. It was observed that the deterioration due to the particle concentration was in the range of 5-10%. At a given particle concentration of 0.05%, abrupt decrease in the Nusselt number and the Raleigh number was observed. The present study with toroidal loop shows that the application of nanofluids for heat transfer intensification should not be decided only by the effective thermal conductivity with increasing particle concentration.

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참고문헌

  1. Keller, J. B., 1966, 'Periodic Oscillations in a Model of Thermal Convection,' Journal of Fluid Mechanics, Vol. 26, pp. 599-606 https://doi.org/10.1017/S0022112066001423
  2. Welander, P., 1967, 'On the Oscillatory Instability of a Differentially Heated Fluid Loop,' Journal of Fluid Mechanics, Vol. 29, pp. 17-30 https://doi.org/10.1017/S0022112067000606
  3. Greif, R., Zvirin, Y., and Mertol, A., 1979, 'The Transient and Stability Behavior of a Natural Convection Loop,' ASME JOURNAL OF HEAT TRANFER, Vol. 101, pp. 684-688 https://doi.org/10.1115/1.3451057
  4. Creveling, H. F., De Paz, J. F., Baladi, J. Y., and Schoenhals, R. J., 1975, 'Stability Characteristics of a Single-Phase Free Convection Loop,' Journal of Fluid Mechanics, Vol.67, pp. 65-84 https://doi.org/10.1017/S0022112075000171
  5. Creveling, H. F., 1964, 'Steady Flow and Stability Characteristics of Free Convection Flow in Circulation Loops,' Ph.D. dissertation, Purdue University
  6. Zvirin, Y., Shitzer, A., and Grossman, G., 1977, 'The Natural Circulation Solar Heater Models with Linear and Nonliner Temperature Distributions,' International Journal of Heat and Mass Transfer, Vol.20, pp. 997-999 https://doi.org/10.1016/0017-9310(77)90072-2
  7. Zvirin, Y., 1981, 'A Review of Natural Circulation Loops in Pressurized Water Reactors and Other Systems,' EPRI Report NP-1676-SR, Jan.1981, to appear in Nuclear Eng.& Design, Vol. 67, pp. 203-225
  8. Zvirin, Y., Jeuck, P. R., Sullivan, C. W., and Duffey, R. B., 1981, 'Experimental and Analytical Investigation of a Natural Circulation System wit Parallel Loop,' ASEM JOURNAL OF HEAT TRANSFER, Vol.103, pp. 645-652 https://doi.org/10.1115/1.3244521
  9. Torrance, K. E., 1979, 'OPEN-Loop Thermosyphons with Geological Applications,' ASME JOURNAL OF HEAT TRANSFER, Vol. 101, pp. 677-683 https://doi.org/10.1115/1.3451056
  10. Wen, D. and Ding, Y., 2005, 'Formulation of Nanofluids for Natural Convective Heat Transfer Applications,' Int. J. of Heat and Flow, Vol. 26, pp. 855-864 https://doi.org/10.1016/j.ijheatfluidflow.2005.10.005
  11. Putra, N., Roetzel, W., Das, S.K., 2003 'Natural convection of nanofluids,' Heat and Mass Transfer,' Vol. 39, pp. 775-784 https://doi.org/10.1007/s00231-002-0382-z
  12. Rhi, S. H et al., 2006, 'Development of Nanofluidic Thermosyphon Heat Sink,' SAREK J, Vol. 18, No. 10, pp. 826-834
  13. Rhi, S. H et al., 2006, 'Cooling System with Nanofluidic Loop Thermosyphon,' KSME J. B, Vol. 30, No. 3, pp. 246-254 https://doi.org/10.3795/KSME-B.2006.30.3.246
  14. Murshed, S.M.S., Leong, K.C. and Yang, C., 2005, 'Ehanced Thermal Conductivity of TiO2-Water Based Nanofluids,' International J. of Thermal Sciences, vol. 44, pp. 367~373 https://doi.org/10.1016/j.ijthermalsci.2004.12.005
  15. Forster, H. K. and Zuber, N., 1955, 'Dynamics of Vapor Bubbles and Boiling Heat Transfer', AIChE J., Vol. 1, p. 531 https://doi.org/10.1002/aic.690010425
  16. Holman, J. P., 1996, 'Heat Transfer,' McGraw-Hill Book Company, New York, Vol. 8
  17. Maxwell, J. C., 1904, 'A Treatise on Electricity and Magnetism,' Oxford University Press, Cambridge, UK, vol. 2, p. 435
  18. Hamilton, R. L. and Crosser, O. K., 1962, 'Thermal Conductivity of Heterogeneous Two Component Systems,' Ind. Eng. Chem. Fundamen., Vol. 2, p.187 https://doi.org/10.1021/i160003a005

피인용 문헌

  1. Study on heat pipe assisted thermoelectric power generation system from exhaust gas pp.0947-7411, 2017, https://doi.org/10.1007/s00231-017-2046-z
  2. Experimental Study on Instability Behavior of Thermosyphon and Grooved Heat Pipe with TiO2-Nanofluid vol.711, pp.1662-8985, 2013, https://doi.org/10.4028/www.scientific.net/AMR.711.285