Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Effects of Mesh Size in a Flat Evaporator and Condenser Cooling Capacity on the Thermal Performance of a Capillary Pumped Loop

  • Boo, Joon-Hong (Department of Aeronautical and Mechanical Engineering, Hankuk Aviation University)
  • Published : 2000.01.01
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Abstract

The thermal performance of a flat evaporator for capillary pumped loop (CPL) applications was investigated. Two to four layers of coarse wire screen wicks were placed onto the heated surface to provide irregular passages for vapor flow. The evaporator and condenser were separated by a distance of 1.2 m and connected by individual liquid and vapor lines. The wall material was copper and the working fluid was ethanol. The experimental facility utilized a combination of capillary and gravitational forces for liquid return, and distribution over the evaporator surface. The tubing used for vapor and liquid lines was 9.35 mm or less in diameter and heat was removed from the condenser by convection of air. A heat flux of up to $4.9{\times}10^4$ $W/m^2$ was applied to a flat evaporator having dimensions of 100 mm by 200 mm, 20 mm thick. The thermal resistance of the system as well as the temperature characteristics of the system was investigated as the evaporator heat flux and the condenser cooling capacity varied. The performance of the evaporator and effect of condenser cooling capacity were analyzed and discussed.

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References

  1. Boo, J. H. and Peterson. G. P., 1995, 'Experimental Study on the Thermal Performance of a Capillary Pumped Loop Having a Flat Evaporator,' Paper No. AIAA-95-3514, Presented at the ASME / AIAA National Heat Transfer Conference, August 6-9, 1995, Portland, Oregon
  2. Dickey, J. T. and Peterson, G. P., 1994, 'Experimental and Analytical Investigation of a Capillary Pumped Loop,' Journal of Thermophysics and Heat Transfer, Vol. 8, No.3, pp. 602-607
  3. Kroliczek, E. J., Ku, J. and Ollendorf, S., 1984, 'Design, Development and Test of a Capillary Pump Loop Heat Pipe,' AIAA 19th Thermophysics Conference, June 24-28, Snowmass, Colorado
  4. Ku, J., 1993, 'Overview of Capillary Pumped Loop Technology,' ASME HTD, Vol. 236, Heat Pipe and Capillary Pumped Loops, pp. 1- 17
  5. Ku, J., Yun, S., and Kroliczek, E., 1992, 'A Prototype Heat Pipe Heat Exchanger for Capillary Pumped Loop Flight Experiment,' AIAA 92 -2910, AJAA 27th Thermophysics Conference, July 6-8, Nashville, Tennessee
  6. Pohner, J. and Antoniuk, D., 1991, 'Recent Enhancements to Capillary Pumped Loop Systems,' AIAA-91-1375, AIAA 26th Thermophysics Conference, June 24-26, Honolulu, Hawaii
  7. Wulz, H. and Embacher, E., 1990, 'Capillary Pumped Loops for Space Applications Experimental and Theoretical Studies on the Performance of Capillary Evaporator Designs,' AIAA 90-1739, AIAA/ ASME 5th Joint Thermophysics and Heat Transfer Conference, June 18-20, Seattle, Washington