Gradient wick channels for enhanced flow boiling HTC and delayed CHF

Ahmadi, Masoud; Bigham, Sajjad

doi:10.1016/j.ijheatmasstransfer.2020.120764

Cited by 20 publications

(2 citation statements)

References 41 publications

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“…To overcome this limitation, gradient wick structures are designed integrating both, large pore sizes to enhance permeability and small pore sizes to enhance capillarity. 185 These gradient wick structures were found to outperform homogenous wick channels, solid n channels and plain copper surfaces due to the resultant enhanced evaporation. More wicked inow was observed at higher mass uxes owing to higher far eld pressures leading to higher HTCs.…”

Section: Effect Of Micro/nanostructure Wickability On Ow Boilingmentioning

confidence: 99%

Advances in micro and nanoengineered surfaces for enhancing boiling and condensation heat transfer: a review

et al. 2023

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Section: Effect Of Micro/nanostructure Wickability On Ow Boilingmentioning

confidence: 99%

Advances in micro and nanoengineered surfaces for enhancing boiling and condensation heat transfer: a review

et al. 2023

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“…Thus, in the negative gradient direction, the contact angle or the capillary radius decreases, resulting in an increase in capillary force; conversely, in the positive gradient direction, the Laplace pressure becomes negative, and liquid transport is unachievable. Therefore, capillary gradient wick structures offer unique advantages in terms of rapid capillary transport [ 26 ] and unidirectional fluid transport capability [ 10 ]. Particularly, unidirectional transport wicks enable heat pipes to transfer heat in only one direction, exhibiting their potential applications in challenging heat diodes.…”

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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Flow boiling heat transfer and pressure drop characteristics of water in a copper foam fin microchannel heat sink

Gao

et al. 2023

Applied Thermal Engineering

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Gradient wick channels for enhanced flow boiling HTC and delayed CHF

Cited by 20 publications

References 41 publications

Advances in micro and nanoengineered surfaces for enhancing boiling and condensation heat transfer: a review

Advances in micro and nanoengineered surfaces for enhancing boiling and condensation heat transfer: a review

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

Flow boiling heat transfer and pressure drop characteristics of water in a copper foam fin microchannel heat sink

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