Investigating the effect of powder-mixing parameter in biporous wick manufacturing on enhancement of loop heat pipe performance

Wu, Shen‐Chun; Wang, Dawn; Lin, Wei-Jhih; Chen, Yau‐Ming

doi:10.1016/j.ijheatmasstransfer.2015.05.074

Cited by 37 publications

(6 citation statements)

References 8 publications

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“…In this study, polymethyl methacrylate (PMMA polymer) was first used for wick manufacturing as a sacrificial layer for large pore formations. Performance testing indicated that, compared with using a mono-porous wick, heat transfer performance was enhanced by 50% results also indicated that larger powder size leads to better vapor transport and evaporation, but beyond a certain point the large pores can cause a weakened structure [19]. Kumar et al (2018) presented the application of bi-porous wick in traditional circular LHP thermal-fluidic transport characteristics of bi-porous wicks for potential loop heat pipe application.…”

Section: Bi-porous Wicksmentioning

confidence: 99%

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: Bi-porous Wicksmentioning

confidence: 99%

Recent Advances in Loop Heat Pipes with Flat Evaporator

Szymański

Law

McGlen

et al. 2021

Entropy

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“…Their experiments also found that reducing the particle cluster size is more favorable for improving the heat transfer performance of LHP. Wu et al (2015) experimentally investigated the use biporous wick with two pore sizes to enhance the performance of loop heat pipe (LHP). It is found that within a certain value range, increasing the content of the pore-forming agent and particle size of the pore-forming agent are conducive to the improvement of heat transfer performance for LHP, but exceeding the certain value will cause a reduction in capillary force, thereby causing a decrease in heat transfer performance.…”

Section: Powder Sintering Wickmentioning

confidence: 99%

Research and Development of Loop Heat Pipe – A Review

Ji¹,

Guo²,

Xu³

2020

Frontiers in Heat and Mass Transfer

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With fast development of electronic devices, novel strategies of thermal management have been received great attention to dissipate high heat fluxes. As an efficient heat transfer device, loop heat pipe (LHP) provides ideal solution for such purpose. Even though LHP was invented nearly half-century ago, challenges still exist on its design, fabrication and operation. The objective of this paper is to present a thorough review on LHPs, paying more attention on the working principle, advantage and configuration. The review is performed in three aspects. First, the macroscopic operation characteristics such as start-up, temperature fluctuations and anti-gravity operation are described. Second, effects of various parameters or factors such as porous wick material, pore size and micro-structure on LHPs are reviewed. Third, new concept LHPs using biporous wick and wettability modification are discussed. Finally, perspective of LHPs is presented, which guides future research and development activities, from both fundamental and application point of view.

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“…The outer layer was made first, then the inner monoporous layer; the manufacturing parameters for the outer layer followed the process suggested in literature [17], using PMMA particles ranging from 250~297 mm in size and 35 vol% in content.…”

Section: Double-layer Wick Manufacturing Processmentioning

confidence: 99%