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

The Korean Society of Mechanical Engineers (대한기계학회)
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Performance Characteristics of a Loop Thermosyphon for Heat Source Cooling

열원 냉각용 루프 써모사이폰의 작동 특성

  • 최두성 (한국과학기술원 기계공학과) ;
  • 송태호 (한국과학기술원 대학원 기계공학과)
  • Published : 2004.12.01
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Abstract

Loop thermosyphon(LTS) has many good characteristics such as low thermal resistance, no power consumption, noiseless operation and small size. To investigate the overall performance of LTS, we have performed various experiments varying three parameters: input power of the heater, working fluid(water, ethanol, FC3283) and filling ratio of the working fluid. At a combination of these parameters, temperature measurements are made at many locations of the LTS. The temperature difference between the evaporator and the condenser is used to obtain the thermal resistance. In addition, flow visualization using a high speed camera is carried out. The thermal resistance is not constant. It is lower at higher input power, which is one of the distinct merits of LTS. Flow instabilities are frequently observed when changing the working fluid, the input power and the filling ratio. The results show that the LTS can be readily put into practical use. Future practical application in electronic cooling is recommended.

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References

  1. Metrol, A., Greif, R. and Zvirin, Y., 1982, 'Two-Dimensional Study of Heat transfer and Fluid Flow in a Natural Circulation Loop,' J. Heat Transfer, Vol. 104, pp. 508-514 https://doi.org/10.1115/1.3245122
  2. Kim, J. S., Lee, U. H., Lee, J. H., Jung, H. S., Kim, J. H. and Jang, I. S., 1999, 'Flow Visualization of Oscillating Capillary Tube Heat Pipe,' collection of thesis of KSME Thermal Engineering Conference, pp. 65-70
  3. 赤地久煇, 1994, 'ル一ブ形蛇行細管ヒ一トペィプ',' 日本機械學會講演論文集, pp. 606-608
  4. Roth, A., 1978, Vacuum Technology, North-holland, New York
  5. Faghri, A., 1995, 'Heat Pipe Science and Technology,' Taylor & Francis, Washington D.C.
  6. Touloukian, Y. S., Purdue University, 1970-79, the TPRC data series, IFI/Plenum, New York
  7. 3M heat transfer fluids, http://cms.3m.comlcms/US/ en/2-178/iilzRFS/view.jhtml
  8. Incropera, F. P. and DeWitt, D. P., 1985, 'Introduction to Heat Transfer,' Wiley, New York
  9. Kim, Young-Lyoul, 1997, 'Analysis of Flow Instabilites in Closed Two Phase Natural Circulation Loops,' Thesis for Ph. D. degree, Department of Mechanical Engineering of Korea Advanced Institute of Science and Technology
  10. Collier, J. G. and Thome, J. R., 1994, 'Convective Boiling and Condensation,' Clarendon Press, New York
  11. Forster, H. K. and Zuber, N., 1955, 'Dynamics of Vapour Bubbles and Boiling Heat Transfer,' AIChE Journal, Vol. 1(4), pp. 531-535 https://doi.org/10.1002/aic.690010425
  12. Black, W. Z. and Hartley, J. G., 1991, Thermodynamics, HarperCollins, New York