Capillary evaporation of water from aluminum high-temperature conductive microporous coating

Fadda, Dani; Godinez, Juan C.; Lee, Jung-Ho; You, Seungkwon

doi:10.1016/j.ijheatmasstransfer.2020.119660

Cited by 12 publications

(3 citation statements)

References 28 publications

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“…The common adsorption of hydrophobic hydrocarbons from the ambient air onto metal surfaces often results in the quick degradation of their hydrophilic/capillary properties [21,116,117], making the creation of long-term stable wicking materials a challenging task. It is known that the treatment of aluminum in hot water improves its both hydrophilic/wicking properties and long-term stability [80][81][82][83]. These effects result from both the modification of the surface chemistry and the formation of "grass-like" surface nanostructures [82].…”

Section: Resultsmentioning

confidence: 99%

“…Our research on efficient wicking materials is motivated by a large variety of their applications in such areas as the thermal management of high-heat flux semiconductor electronics [65], cooling data centers [66,67], energy-harvesting [68], thermal management of robots [69], water desalination [18,70], waste heat recovery [71][72][73], spacecraft thermal management [74,75], and Maisotsenko cycle (M-cycle) technologies [76][77][78][79]. Our choice of aluminum is stimulated by its longterm stable wicking properties due to the formation of a hydrophilic aluminum oxide hydroxide [γ-AlO(OH)] surface layer (referred to as the Boehmite layer) caused by the chemical interaction of aluminum with hot water that improves both the hydrophilic and corrosion-resistance properties of Al wicks [80][81][82][83]. Previously, capillary flow dynamics in microgrooves produced on an aluminum surface by femtosecond laser pulses has been studied at the stage of the classic Washburn flow at room temperature [15,16,18].…”

Section: Introductionmentioning

confidence: 99%

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Superwicking Functionality of Femtosecond Laser Textured Aluminum at High Temperatures

et al. 2021

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An advanced superwicking aluminum material based on a microgroove surface structure textured with both laser-induced periodic surface structures and fine microholes was produced by direct femtosecond laser nano/microstructuring technology. The created material demonstrates excellent wicking performance in a temperature range of 23 to 120 °C. The experiments on wicking dynamics show a record-high velocity of water spreading that achieves about 450 mm/s at 23 °C and 320 mm/s at 120 °C when the spreading water undergoes intensive boiling. The lifetime of classic Washburn capillary flow dynamics shortens as the temperature increases up to 80 °C. The effects of evaporation and boiling on water spreading become significant above 80 °C, resulting in vanishing of Washburn’s dynamics. Both the inertial and visco-inertial flow regimes are insignificantly affected by evaporation at temperatures below the boiling point of water. The boiling effect on the inertial regime is small at 120 °C; however, its effect on the visco-inertial regime is essential. The created material with effective wicking performance under water boiling conditions can find applications in Maisotsenko cycle (M-cycle) high-temperature heat/mass exchangers for enhancing power generation efficiency that is an important factor in reducing CO2 emissions and mitigation of the global climate change.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Superwicking Functionality of Femtosecond Laser Textured Aluminum at High Temperatures

et al. 2021

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“…The studies based on using buoyancy and gravity in the form of a vertical plane with a thin gap between glass and a vertical pipe are as follows. Lee et al [60] fabricated a porous coating on a vertical Al plate surface and immersed part of it in distilled water to increase the water on the surface as the same as Figure 7b. As the particle size increases, the CHF increases.…”

Section: Buoyancy and Surface Tensionmentioning

confidence: 99%

Recent Advances in Two-Phase Immersion Cooling with Surface Modifications for Thermal Management

et al. 2022

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This paper reviews the major researchers of liquid, immersion, and two-phase cooling. Currently, liquids are used instead of air to cool the growing data centers. Immersion cooling shows a higher heat transfer coefficient than conventional cooling (<37 W/cm2). Because the use of liquids with high global warming potentials is prohibited, the number of liquids that can be used is limited. This paper discusses the existing, relevant literature from researchers who have studied the issue at least thrice. The authors were divided into those who focused on the surface and those who formed a structure on the surface. In summary, the authors suggested the following research directions: The experimental conditions of porous foam are not diverse, and there is a concern about the separation of foam and coating into the tub. The experimental conditions of the immersion tub should also be varied according to the heat and pressure over time. Structure-level research shows higher performance than surface-level research, but an economic feasibility study is required.

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Effect of integrated copper pad on the performance of boiling-driven wickless thermal ground plane

Moon

Fadda

Shin

et al. 2021

Applied Thermal Engineering

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Capillary evaporation of water from aluminum high-temperature conductive microporous coating

Cited by 12 publications

References 28 publications

Superwicking Functionality of Femtosecond Laser Textured Aluminum at High Temperatures

Superwicking Functionality of Femtosecond Laser Textured Aluminum at High Temperatures

Recent Advances in Two-Phase Immersion Cooling with Surface Modifications for Thermal Management

Effect of integrated copper pad on the performance of boiling-driven wickless thermal ground plane

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