Experimental investigation on temperature oscillation of loop heat pipes
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摘要: 对实验中观察到的环路热管温度波动现象进行了描述和解释.实验发现,较小热载荷和较大热载荷下环路热管容易出现温度波动现象.对于蒸发器充满液体的启动情况,小热载荷启动容易出现毛细芯内的工质蒸发现象,芯内蒸发继而引起冷凝器入口处的温度波动,并且最终导致可变热导区的稳态工作温度偏高.冷凝器出口处的温度波动现象产生的原因是工质充装量和储液器容积的不匹配,冷凝器出口的温度波动可以通过对工质充装量的控制来避免.Abstract: The phenomenon of temperature oscillation in loop heat pipes was described and explained. Test results indicate that temperature oscillation frequently occurred at very low and very high heat loads. At low start-up heat loads evaporation inside the primary wick was easy to occur when the evaporator, including vapor grooves and evaporator core, were flooded with liquid. Evaporation inside the wick will lead to the temperature oscillation at the condenser inlet. Start-ups with temperature oscillation at the condenser inlet will shift the steady state operating temperatures higher than normal. While at high heat loads, vapor can not be condensed absolutely in condenser for its limit ability to reject heat and temperature oscillation will occur at the condenser outlet, which can be avoided by increasing the working fluid charge mass.
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Key words:
- loop heat pipe /
- temperature oscillation /
- reverse flow /
- start-up
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[1] Ku J. Operating characteristics of loop heat pipes . SAE paper NO 1999-01-2007, 1999 [2] 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 [3] Ku J, Ottenstein L, Kovel M, et al. Temperature oscillations in loop heat pipe operation . Space Technology and Application International Forum . Albuquerque, 2001.255~262 -
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