Experimental study of flat-disk loop heat pipe with R1233zd(E) for cooling terrestrial electronics

Zhao, Runze; Zhang, Zikang; Zhao, Shuaicheng; Cui, Haichuan; Liu, Zhichun; Liu, Wei

doi:10.1016/j.applthermaleng.2021.117385

Cited by 19 publications

(2 citation statements)

References 32 publications

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“…LHP necessitates a reservoir (called compensation chamber, CC), that lets the device adapt to different working temperatures and loads by maintaining vapor-liquid equilibrium when more (at higher heat loads) or less (lower heat loads) liquid is contained in the CC. Despite having a track record in space applications (see [1]) and emerging terrestrial applications (like the consumer electronics [2]), the ongoing research still concerns LHP design and modelling aspects. It is still challenging to model how a particular LHP will respond to changing conditions in heat power or temperature.…”

Section: Introductionmentioning

confidence: 99%

Review of “cold shock” cases in operation of loop heat pipes and related thermal instabilities

Ivanovskis,

Mishkinis

2024

J. Phys.: Conf. Ser.

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Loop Heat Pipes (LHP) are passive two-phase heat transfer devices, driven by capillary pumps that source energy for circulation of working fluid solely from the heat source. They have a proven track record in spacecraft thermal control as well as terrestrial applications. However, LHP may experience partial or complete wick dryout and thermal instabilities at rapid power-up steps or (and) rapid condenser cooling conditions change due to a rapid inflow of subcooled liquid from the condenser into the evaporator. Such cases do not have very wide coverage in literature and are usually presented as a little nuisance in testing of a particular LHP, for which some design workaround was found. Oftentimes suggested solutions trade performance or other design merits for robustness of operation. This article aims to review such case studies where phenomena similar to the described “cold shock” affected LHP performance. The aforementioned instabilities become even more pronounced in grid-like multievaporator LHP having multiple parallel connections between capillary pumps and compensation chambers, as heat and mass transfer between those elements becomes less definite and can eventually increase the heat leak into compensation chambers. Vulnerability of LHP with distributed network of evaporators to seemingly “safe” transient regimes fosters deeper analysis of the “cold shock” phenomenon. With comprehensive definition to the problem and a list of research questions, technical measures for getting rid of it in perspective LHP designs can be foreseen.

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Section: Introductionmentioning

confidence: 99%

Review of “cold shock” cases in operation of loop heat pipes and related thermal instabilities

Ivanovskis,

Mishkinis

2024

J. Phys.: Conf. Ser.

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“…There are several excellent materials for wicks, such as nickel, titanium, polymeric, ceramic, copper and stainless steel, while those made of carbonyl nickel powder possess the highest purity, controllable porosity and pore size, appropriate mechanical properties, moderate thermal conductivity, and compatibility with various working fluids. Hence, carbonyl nickel powder is widely used to fabricate high-performance wicks [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

The Pore Microstructure Evolution and Porous Properties of Large Capillary Pressure Wicks Sintered with Carbonyl Nickel Powder

Zheng

Wang

et al. 2022

Materials

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We investigated the effect of different sintering temperatures ranging from 200 °C to 600 °C on the porous properties and pore microstructure of large capillary pressure wicks made of carbonyl nickel powder. The evolution model of hydraulic diameter was established and verified by the maximum pore diameter. Hydraulic diameter changed as the roughness of particle surfaces decreased and sintering necks grew large during sintering. In the contact-formation stage and the initial sintering stage (200–500 °C), the decrease in the roughness of particle surfaces played a decisive role, contributing to an increase in hydraulic diameter. In the intermediate sintering stage (600 °C), the growth of sintering necks dominated the process, however the hydraulic diameter was reduced. These results show that the maximum pore diameter first increased and then decreased in the same way as our evolution model. Permeability and capillary performance of the wicks first increased and then declined with increasing sintering temperature. We found the optimal sintering temperature to be 400 °C, at which point the wicks achieved the maximum pore diameter of 1.21 μm, a permeability of 1.77 × 10−14 m2, and their highest capillary performance of 1.46 × 10−8 m.

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Study of a new thin flat loop heat pipe for electronics

et al. 2023

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Experimental study of flat-disk loop heat pipe with R1233zd(E) for cooling terrestrial electronics

Cited by 19 publications

References 32 publications

Review of “cold shock” cases in operation of loop heat pipes and related thermal instabilities

Review of “cold shock” cases in operation of loop heat pipes and related thermal instabilities

The Pore Microstructure Evolution and Porous Properties of Large Capillary Pressure Wicks Sintered with Carbonyl Nickel Powder

Study of a new thin flat loop heat pipe for electronics

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