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Volume 32 Issue 08
Aug.  2006
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Journal of Beijing University of Aeronautics and Astronautics  > 2006  >  32(08): 894-898.
Yang Min, Lu Hongnian, Kong Fanqin, et al. Non-linear least square estimation of geometrical parameters for cone-beam three dimensional computed tomography[J]. Journal of Beijing University of Aeronautics and Astronautics, 2005, 31(10): 1135-1139. (in Chinese)
Citation: Bai Lizhan, Lin Guiping, Zhang Hongxinget al. Steady state modeling of loop heat pipes and operating characteristics analysis[J]. Journal of Beijing University of Aeronautics and Astronautics, 2006, 32(08): 894-898. (in Chinese)
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Steady state modeling of loop heat pipes and operating characteristics analysis

  • School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • Received Date: 19 Oct 2005
  • Publish Date: 31 Aug 2006
    Abstract
  • Based on energy balance, pressure balance, mass conservation and geometric constraint, the steady state model of loop heat pipes was established and solved. The modeling results not only confirms the steady state operating characteristics of loop heat pipes introduced in many literatures, but also brings forward viewpoint to the problems below:the analysis of the heat leak of the evaporator, the reason of the generation of the variable heat conductance zone and the constant heat conductance zone, the variation of the heat conductance in the constant heat conductance zone and the calculation of the mass of the working fluid charged and the volume of the compensation chamber. Results show that the heat leak of the evaporator for heating the liquid through the wick can not be neglected at high heat load;adverse gravity elevation and the heating from environment to the return liquid are the reason of the generation of the variable heat conductance zone;the heat conductance in the constant heat conductance zone decreases as the heat load increases at high heat load, and can reach the critical heat load, which can be avoided by the match of the mass of the working fluid charged and the volume of the compensation chamber.

     

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    • References(1)
  • [1] Parker M L. Modeling of loop heat pipe with applications to spacecraft thermal control . Pennsylvania:Faculty of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, 2000 [2] Ku J. Operating characteristics of loop heat pipes . SAE paper NO 1999-01-2007,1999 [3] Watson H L. Thermal analysis of a loop heat pipe evaporator and compensation chamber . Las Cruces, New Mexico:New Mexico State University, 2001 [4] Ogushi T, Haga S, Ishikawa H, et al. Mathematical modeling for predicting steady state and transient characteristics of reservoir embedded looped heat pipe (RELHP) . SAE paper NO 2001-01-2239,2001 [5] 张红星,林贵平,丁汀,等. 环路热管温度波动现象的实验分析[J].北京航空航天大学学报,2005,31(2):116-120 Zhang Hongxing,Lin Guiping,Ding Ting,et al. Experimental investigation on temperature oscillation of loop heat pipes[J]. Journal of Beijing University of Aeronautics and Astronautics,2005,31(2):116-120(in Chinese)
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