Droplet Boiling on Micro-Pillar Array Surface ─ Transition Boiling Regime

Wang, Tianjiao; Hu, Zhixuan; Shen, Shengqiang; Liang, Gangtao

doi:10.1021/acs.langmuir.3c02550

Cited by 2 publications

(1 citation statement)

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“…Quantifying parameters such as the critical heat flux (CHF) and heat transfer coefficient (HTC) are intrinsic to optimizing boiling and condensation processes, especially for efficient heat removal in compact devices. Notably, CHF, representing the maximum heat transfer capacity, emerges as a crucial factor in enhancing the thermal stability of such systems. , The interaction between the liquid and vapor phases at the solid heater surface significantly impacts overall heat and mass transfer, thereby influencing the performance of heat transfer equipment. , Altering the solid–liquid interface through techniques like introducing surface roughness, intricate multiscale morphologies, and inhomogeneities has been demonstrated to enhance phase change heat transfer. − These modifications give rise to multiscale phenomena, including intermolecular and capillary forces, contact angle hysteresis, microscale evaporation, and interfacial thermophysics. These factors play a critical role in macroscopic heat transfer .…”

Section: Introductionmentioning

confidence: 99%

Speleothem-Inspired Copper/Nickel Interfaces for Enhanced Liquid–Vapor Transport by Marangoni and Soret Effects

Rozati,

Khriwish,

Gupta

2024

Langmuir

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Geological formations have superior wickability and support the absorption of water and oils into narrow spaces of Earth's crust without external assistance. In this study, we present speleothem inspired heterogeneous porous and wicked copper (Cu)/nickel (Ni) interfaces for enhanced nucleate boiling of water/ethanol mixtures for energy-efficient separation processes. The incorporation of Ni strands within the copper particle matrix significantly enhanced heat transfer. Compared to plain copper, the Cu/Ni speleothem surfaces exhibited a 61% increase in the heat transfer coefficient for water/ ethanol mixtures and a 332% increase for water, with a 58% faster onset of nucleate boiling. This enhancement was attributed to Marangoni and Soret effects at the Cu/Ni interfaces, driven by surface tension and concentration gradients. Furthermore, the synergistic wicking action of the Ni strands facilitated rewetting of the surface, replenishing liquid to the porous nucleation sites and preventing surface dry-out, thereby improving the overall heat transfer performance.

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Section: Introductionmentioning

confidence: 99%

Speleothem-Inspired Copper/Nickel Interfaces for Enhanced Liquid–Vapor Transport by Marangoni and Soret Effects

Rozati,

Khriwish,

Gupta

2024

Langmuir

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Super‐Flexible Water‐Proof Actuators

Liu,

Yang,

Yan

et al. 2024

Small

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Humidity‐responsive materials hold broad application prospects in sensing, energy production, and other fields. Particularly, humidity‐sensitive, flexibility, and water resistance are pivotal factors in the development of optimized humidity‐responsive materials. In this study, hydrophobic linear polyurethane and hydrophilic 4‐vinylphenylboronic acid (4‐VPBA) form a semi‐intercross cross‐linking network. This copolymer of polyurethane exhibits excellent humidity‐sensitive, mechanical properties, and water resistance. Its maximum tensile strength and maximum elongation can reach 40.56 MPa and 543.47%, respectively. After being immersed in water at various temperatures for 15 days, it exhibited a swelling ratio of only 3.28% in water at 5 °C and 9.58% in water at 70 °C. While the presence of 4‐VPBA network imparts humidity‐sensitive, reversible, and multidirectional bending abilities, under the stimulus of water vapor, it can bend 43° within 1.4 s. The demonstrated material surpasses current bidirectional humidity actuators in actuating ability. Based on these characteristics, automatically opening waterproof umbrellas and windows, as well as bionic‐arms, crawling robots, and self‐propelled boats, are successfully developed.

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Droplet Boiling on Micro-Pillar Array Surface ─ Transition Boiling Regime

Cited by 2 publications

References 58 publications

Speleothem-Inspired Copper/Nickel Interfaces for Enhanced Liquid–Vapor Transport by Marangoni and Soret Effects

Speleothem-Inspired Copper/Nickel Interfaces for Enhanced Liquid–Vapor Transport by Marangoni and Soret Effects

Super‐Flexible Water‐Proof Actuators

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