Research Progress and Prospect of Heat Pipe Capillary Wicks

Li, Jinwang; Lu, Ningxiang; Sun, Yongkang

doi:10.5098/hmt.18.24

Cited by 6 publications

(4 citation statements)

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“…The phenomenon of improved heat transfer capabilities, often associated with heightened porosity levels, is attributed to the robust capillary pumping system's high capacity and reduced heat leakage between the evaporation and condensation sections [75,80]. Nevertheless, it is essential to exercise caution when dealing with high porosity values that generally exceed 30% to 60%, as these can disrupt fluid distribution and compromise wick mechanical strength, ultimately leading to an increase in thermal resistance [81].…”

Section: Resultsmentioning

confidence: 99%

Li-Ion Battery Immersed Heat Pipe Cooling Technology for Electric Vehicles

Oh,

Lee,

Han

et al. 2023

Electronics

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Lithium-ion batteries, crucial in powering Battery Electric Vehicles (BEVs), face critical challenges in maintaining safety and efficiency. The quest for an effective Battery Thermal Management System (BTMS) arises from critical concerns over the safety and efficiency of lithium-ion batteries, particularly in Battery Electric Vehicles (BEVs). This study introduces a pioneering BTMS solution merging a two-phase immersion cooling system with heat pipes. Notably, the integration of NovecTM 649 as the dielectric fluid substantially mitigates thermal runaway-induced fire risks without requiring an additional power source. Comprehensive 1-D modeling, validated against AMESim (Advanced Modeling Environment for Simulation of Engineering Systems) simulations and experiments, investigates diverse design variable impacts on thermal resistance and evaporator temperature. At 10 W, 15 W, and 20 W heat inputs, the BTMS consistently maintained lithium-ion battery temperatures within the optimal range (approximately 27–34 °C). Optimized porosity (60%) and filling ratios (30–40%) minimized thermal resistance to 0.3848–0.4549 °C/W. This innovative system not only enhances safety but also improves energy efficiency by reducing weight, affirming its potential to revolutionize lithium-ion battery performance and address critical challenges in the field.

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Section: Resultsmentioning

confidence: 99%

Li-Ion Battery Immersed Heat Pipe Cooling Technology for Electric Vehicles

Oh,

Lee,

Han

et al. 2023

Electronics

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“…In recent years, with the development of aerospace technology [ 1 ], high-speed servers [ 2 ], and the miniaturization of electronic devices [ 3 ], the heat generated within integrated circuits has significantly increased, posing great challenges to thermal management. Heat pipes play an important role in the thermal management of IC chips due to their high reliability and desirable capacity to cool extremely high heat flux [ 4 ]. The wick structure is functional in the transport of working fluid, and it can ensure the rapid backflow of working fluid to the evaporator.…”

Section: Introductionmentioning

confidence: 99%

Gradient-Pattern Micro-Grooved Wicks Fabricated by the Ultraviolet Nanosecond Laser Method and Their Enhanced Capillary Performance

Huang,

Liao,

Fan

et al. 2024

Micromachines

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Capillary-gradient wicks can achieve fast or directional liquid transport, but they face fabrication challenges by traditional methods in terms of precise patterns. Laser processing is a potential solution due to its high pattern accuracy, but there are a few studies on laser-processed capillary-gradient wicks. In this paper, capillary step-gradient micro-grooved wicks (CSMWs) were fabricated by an ultraviolet nanosecond pulsed laser, and their capillary performance was studied experimentally. The CSMWs could be divided into three regions with a decreasing capillary radius. The equilibrium rising height of the CSMWs was enhanced by 124% compared to the non-gradient parallel wick. Different from the classical Lucas–Washburn model describing a uniform non-gradient wick, secondary capillary acceleration was observed in the negative gradient direction of the CSMWs. With the increase in laser power and the decrease in scanning speed, the capillary performance was promoted, and the optimal laser processing parameters were 4 W-10 mm/s. The laser-enhanced capillary performance was attributed to the improved hydrophilicity and reduced capillary radius, which resulted from the increased surface roughness, protrusion morphology, and deep-narrow V-shaped grooves induced by the high energy density of the laser. Our study demonstrates that ultraviolet pulsed laser processing is a highly efficient and low-cost method for fabricating high-performance capillary gradient wicks.

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“…The capillary action of the wick can increase the heat transfer coefficient and the critical heat flux in evaporation and boiling heat transfer processes through optimal delivery of coolant fluid to the heated area. [10]- [13] The permeability of a mesh wick refers to its ability to allow fluids to pass through it. It is influenced by the size and shape of the pores in the wick, and when multiple, immiscible phases are present, the surface tension of the liquids and surface energy of the matrix and the relative pressure within each phase.…”

Section: Introductionmentioning

confidence: 99%

“…Additional studies have measured in-plane relative permeability of thin, porous films. [13], [32] The environment can play a role in the fluid flow properties of woven meshes, particularly through its effect on evaporation from the wick. [33] Changes in temperature and relative humidity can alter the radius of curvature of the liquid-vapor interface as described by the Kelvin equation.…”

Section: Introductionmentioning

confidence: 99%

Permeability of Single-Layer-Free-Standing Meshes at Varying Capillary Pressure via a Novel Method

Shattique¹,

Giglio²,

Dede³

et al. 2023

Preprint

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The permeability of mesh wicks is important for various applications, for example two-phase heat transfer. However, our understanding of the permeability of single-layer, free-standing mesh wicks (SLFSMW), with liquid-gas interfaces on both sides, is limited. We present a novel and simpler method to determine the permeability of a SLFSMW and apply it to a representative mesh. Our method involves modifying the capillary pressures elevation and simultaneously measuring the permeability to determine the permeability-capillary pressure relationship. When applied to a copper mesh with plain weave having undergone careful surface cleaning, the permeability is found to decrease as capillary pressure for deionized (DI) water increases. We present dimensional analysis to generalize our data for other mesh sizes with similar weaves, and fluids. We model the behavior of mesh in application based on the integration of Darcy’s law with an analytic function fit to measured data and conduct parametric studies to investigate the superficial velocity of liquids through the mesh under varying driving pressures, transport lengths, and liquid viscosity based on the obtained capillary pressure-permeability relationship. This study provides valuable insights into the transport properties of mesh wicks, with potential applications in fields such as electronics cooling, electrochemical devices, and fluid purification technologies.

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Research Progress and Prospect of Heat Pipe Capillary Wicks

Cited by 6 publications

References 0 publications

Li-Ion Battery Immersed Heat Pipe Cooling Technology for Electric Vehicles

Li-Ion Battery Immersed Heat Pipe Cooling Technology for Electric Vehicles

Gradient-Pattern Micro-Grooved Wicks Fabricated by the Ultraviolet Nanosecond Laser Method and Their Enhanced Capillary Performance

Permeability of Single-Layer-Free-Standing Meshes at Varying Capillary Pressure via a Novel Method

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