Journal ArticleDOI
Startup characteristics of an ammonia loop heat pipe with a rectangular evaporator
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TLDR
In this article, a stainless steel-ammonia flat-plate loop heat pipe (FLHP) was developed, and extensive experiments have been conducted to investigate its startup characteristics with the evaporator in the horizontal and vertical positions.Abstract:
Flat-plate loop heat pipe (FLHP) is a passive two-phase heat transfer device. Comparing with traditional LHP with a cylindrical evaporator, it can be directly connected to a flat heat source without the employment of a saddle, which can effectively reduce the system thermal resistance and enhance the temperature uniformity. In this work, a stainless steel-ammonia FLHP was developed, and extensive experiments have been conducted to investigate its startup characteristics with the evaporator in the horizontal and vertical positions. Experimental results show that the FLHP exhibits excellent startup performance. It can successfully start up at a small heat load as low as 2 W with no obvious temperature overshoot. In a wide power range of 5–35 W, the FLHP generally starts up in only one situation, much simpler than the startup of a LHP with a cylindrical evaporator. For this rectangular evaporator, the heat leak from the evaporator to the compensation chamber (CC) becomes very small. As a result, the vapor can easily exit the condenser in most cases in the power range of 5–35 W, leading to a 100% utilization efficiency of the condenser and the resultant satisfactory thermal performance of the FLHP. In addition, the startup performance and the system thermal resistance of the FLHP are insensitive to the evaporator orientation, promising great application potential in future electronics cooling.read more
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Journal ArticleDOI
The equilibrium contact angle of ammonia-stainless steel interface
TL;DR: In this paper , the equilibrium contact angle identification at the interface of ammonia and stainless steel plates (SS316L) at different temperatures was performed using the capillary rise at the vertical plate approach.
References
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Journal ArticleDOI
Loop heat pipes
TL;DR: Loop heat pipes (LHPs) as mentioned in this paper are two-phase heat-transfer devices with capillary pumping of a working fluid, which can transfer heat efficiency for distances up to several meters at any orientation in the gravity field, or to several tens of meters in a horizontal position.
Proceedings ArticleDOI
Operating Characteristics of Loop Heat Pipes
TL;DR: The loop heat pipe (LHP) is a two-phase heat transfer device that utilizes the evaporation and condensation of a working fluid to transfer heat, and the capillary forces developed in fine porous wicks to circulate the fluid.
Journal ArticleDOI
Electronics cooling with nanofluids: A critical review
Mehdi Bahiraei,Saeed Heshmatian +1 more
TL;DR: In this article, the authors reviewed the use of nanofluids in electronics cooling considering several aspects such as liquid block type, numerical approach, nanoparticle material, energy consumption, and second law of thermodynamics.
Journal ArticleDOI
Miniature loop heat pipes for electronics cooling
TL;DR: In this paper, the development of miniature loop heat pipes (mLHPs) with a nominal capacity of 25-30 W and a heat transfer distance up to 250 mm was investigated for cooling electronics components and CPU of mobile PC.
Journal ArticleDOI
Experimental study on the loop heat pipe with a planar bifacial wick structure
Wukchul Joung,Taeu Yu,Jinho Lee +2 more
TL;DR: In this paper, a thin planar bifacial evaporator with a Bifacial wick structure was devised, and the operating characteristics in a horizontal position for different fluid inventories were examined in detail.