Experimental and theoretical study of a novel loop heat pipe

Zhu, Kai; Li, Xueqiang; Li, Hailong; Chen, Xiaoqing; Wang, Yabo

doi:10.1016/j.applthermaleng.2017.11.020

Cited by 21 publications

(2 citation statements)

References 26 publications

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“…The results show that the LHP can start up smoothly at any heat load and the highest temperature of LHP does not exceed 90 °C [61]. To eliminate a parasitic heat leak in the evaporator and to reduce circulation flow resistance Wang et al (2016) [62][63][64] proposed a novel flat type evaporator with the wick separated from the heating surface, where the circulation inside LHP is mainly driven by the phase change formed at the vapor-liquid interface, unlike a traditional LHP where the pumping force is provided by the capillary wick. The schematic of the evaporator where the heating surface had no direct contact with the wick is presented in Figure 16.…”

Section: Modification In Construction Of Lhpmentioning

confidence: 95%

Recent Advances in Loop Heat Pipes with Flat Evaporator

Szymański

Law

McGlen

et al. 2021

Entropy

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The focus of this review is to present the current advances in Loop Heat Pipes (LHP) with flat evaporators, which address the current challenges to the wide implementation of the technology. A recent advance in LHP is the design of flat-shaped evaporators, which is better suited to the geometry of discretely mounted electronics components (microprocessors) and therefore negate the need for an additional transfer surface (saddle) between component and evaporator. However, various challenges exist in the implementation of flat-evaporator, including (1) deformation of the evaporator due to high internal pressure and uneven stress distribution in the non-circular casing; (2) heat leak from evaporator heating zone and sidewall into the compensation chamber; (3) poor performance at start-up; (4) reverse flow through the wick; or (5) difficulties in sealing, and hence frequent leakage. This paper presents and reviews state-of-the-art LHP technologies; this includes an (a) review of novel manufacturing methods; (b) LHP evaporator designs; (c) working fluids; and (d) construction materials. The work presents solutions that are used to develop or improve the LHP construction, overall thermal performance, heat transfer distance, start-up time (especially at low heat loads), manufacturing cost, weight, possibilities of miniaturization and how they affect the solution on the above-presented problems and challenges in flat shape LHP development to take advantage in the passive cooling systems for electronic devices in multiple applications.

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Section: Modification In Construction Of Lhpmentioning

confidence: 95%

Recent Advances in Loop Heat Pipes with Flat Evaporator

Szymański

Law

McGlen

et al. 2021

Entropy

View full text Add to dashboard Cite

show abstract

“…Furthermore, a higher pressure creates a higher vapor density, thereby reducing the vapor flow resistance, which is of benefit in the gravity-assisted heat pipe systems. Thus, the working pressure plays an important role in the circulation of the working fluid [25] and may be used as a criterion to select the working fluid.…”

Section: Introductionmentioning

confidence: 99%

Working Fluid Evaluation Criteria for Loop Gravity-assisted Heat Pipe

Chen

Liu

Xiongwen

2022

Preprint

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Loop gravity-assisted heat pipe (LGHP) has the characteristics of passive heat dissipation and wide application prospect. Different working fluids lead to great differences in their working performance (Critical heat flux (CHF)). Therefore, it is of great significance to evaluate the performance of LGHP working fluid for its design. Based on the basic theories of CHF and hydrodynamics, the pressure drop models of laminar, smooth turbulence, and completely rough turbulence flows were established, and an extensible two-phase composite property parameter was obtained. Based on it, the physical property parameter of transitional rough turbulent flow was also derived. Finally, experiments were conducted and showed that there was almost a linear relationship between CHFs and the derived physical parameter. Therefore, the physical parameters derived in this paper can be used as good criteria for the selection of LGHP working fluid.

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Characteristic of temperature oscillation during the operation of loop heat pipe enhanced by pressure head of evaporation

Zhang

Wang

et al. 2022

Heat Mass Transfer

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Experimental and theoretical study of a novel loop heat pipe

Cited by 21 publications

References 26 publications

Recent Advances in Loop Heat Pipes with Flat Evaporator

Recent Advances in Loop Heat Pipes with Flat Evaporator

Working Fluid Evaluation Criteria for Loop Gravity-assisted Heat Pipe

Characteristic of temperature oscillation during the operation of loop heat pipe enhanced by pressure head of evaporation

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