Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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The Study on Pressure Oscillation and Heat Transfer Characteristics of Oscillating Capillary Tube Heat Pipe

  • Published : 2003.10.01
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Abstract

In the present study, the characteristics of pressure oscillation and heat transfer performance in an oscillating capillary tube heat pipe were experimentally investigated with respect to the heat flux, the charging ratio of working fluid, and the inclination angle to the horizontal orientation. The experimental results showed that the frequency of pressure oscillation was between 0.1 Hz and 1.5 Hz at the charging ratio of 40 vol.%. The saturation pressure of working fluid in the oscillating capillary tube heat pipe increased as the heat flux was increased. Also, as the charging ratio of working fluid was increased, the amplitude of pressure oscillation increased. When the pressure waves were symmetric sinusoidal waves at the charging ratios of 40 vol.% and 60 vol.%, the heat transfer performance was improved. At the charging ratios of 20 vol.% and 80 vol.%, the waveforms of pressure oscillation were more complicated, and the heat transfer performance reduced. At the charging ratio of 40. vol.%, the heat transfer performance of the OCHP was at the best when the inclination angle was 90$^{\circ}$ the pressure wave was a sinusoidal waveform, the pressure difference was at the least, the oscillation amplitude was at the least, and the frequency of pressure oscillation was the highest.

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References

  1. Akachi, H., 1994, 'Looped Capillary Tube Heat Pipe,' Proceedings of 71th General Meeting conference of JSME, Vol. 3, No. 940-10, pp. 606-611
  2. Faghri, A., 1995, Heat Pipe Science and Technology, Taylor and Francis, Washington, pp. 1-34
  3. Izumi, T., Gi, K. and Maezawa, S., 1998, 'Heat Transfer Characteristics of Double-Ended Closed Oscillating Capillary Tube Heat Pipe,' Journal of JAHP, Vol. 17, No. 1, pp. 7-11.(in Japanese)
  4. Kim, J. S., Jung, H, S,, Kim, J. H. and Kim, J. W., 2001, 'Flow Visualization of Oscillation Characteristics of Liquid and Vapor in Oscillating Capillary Tube Heat Pipe,' The 6th Asian Symposium on Visualization, Pusan,Korea, pp. 398-401
  5. Kim, J. H., Lee, W. H., Lee, J. H., Jung, H. S., Kim, J. H. and Jang, J. I., 1999, 'Flow Visualization of Oscillating Capillary Tube Heat Pipe,' Proceeding of Thermal Engineering Conference of KSME, pp. 65-70.(in Korean)
  6. Lee, W. H., Jung, H. S., Kim, J. H. and Kim, J. S., 1999a, 'Flow Visualization of Oscillating Capillary Tube Heat Pipe,' 11th International Heat Pipe Conference, Tokyo, Japan, Vol. 2, pp. 131-136
  7. Lee, W. H., Kim, J. H., Kim, J. S. and Jang, I. S., 1999b, 'The Heat Transfer Characteristics of Oscillating Capillary Tube Heat Pipe,' 2nd Two-Phase Flow Modelling and Experimentation, Pisa, Italy, Vol. 3, pp. 1713-1718
  8. Maezawa, S., 1995, 'Working Principle and Thermal Characteristics of Heat Pipe and Thermosyphon,' Journal of JAHP, Vol. 14, No. 2, pp. 1-11
  9. Miyazaki, Y. and Akachi, H., 1996, 'Heat Transfer Characteristics of Looped Capillary Heat Pipe,' Proceeding of the 5th International Heat Pipe Symposium, Melbourne, pp. 378-383
  10. Suzuki, O., 2000-5, 'Heat transfer characteristics of a Bubble-Driven Capillary Heat Pipe,' 37th National Heat Transfer Symposium of Japan, pp. 35-36. (in Japanese)