Molecular dynamics simulations of the liquid film evaporation heat transfer on different wettability hybrid surfaces at the nanoscale

Cao, Qun; Shao, Wei; Ren, Xiaohan; Ma, Xiaoteng; Shao, Kwang‐Tsao; Cui, Zheng; Liu, Yu

doi:10.1016/j.molliq.2020.113610

Cited by 32 publications

(9 citation statements)

References 38 publications

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“…First, the whole system is set in an NVT ensemble at 300.0 K for 1000 ps and then reaches a thermodynamic equilibrium state . Subsequently, the water molecules are set in an NVE ensemble, and the temperature of the heat source layer in the solid gradually increases from 300.0 to 1000.0 K in 3500 ps at a heating rate of 0.20 K·ps –1 . , The Velocity-Verlet algorithm is used to describe the position and velocity of each atom every 1 fs, and the data are dumped out every 1000 fs.…”

Section: Simulation Methodsmentioning

confidence: 99%

Molecular Insight into Bubble Nucleation on the Surface with Wettability Transition at Controlled Temperatures

et al. 2021

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A surface with a smart wettability transition has recently been proposed to enhance the boiling heat transfer in either macro- or microscale systems. This work explores the mechanisms of bubble nucleation on surfaces with wettability transitions at controlled temperatures by molecular simulations. The results of the interaction energy at the interface and potential energy distribution of water molecules show that the nanostructure promotes nucleation over the copper surface and causes lower absolute potential energy to provide fixed nucleation sites for the initial generation of the bubble nucleus and shortens the incipient nucleation time, as compared to the mixed-wettability or hydrophilic nanostructure surface. An investigation on more nanostructured surfaces shows that a surface (F) with a wettability transition temperature of 620.0 K has the shortest average incipient nucleation time at 1672 ps with a wall temperature of 634.3 K. The surface with tunable wettability has also a high interfacial thermal conductance at low superheats, but it may not promote the critical heat flux at high superheats. The heat-transfer performance of the smart surface is better than the plate, the hydrophobic nanostructure, and the mixed-wettability surfaces, while it is lower than the hydrophilic nanostructure surface. This proposes a new method and provides insight for promoting bubble nucleation on a surface with temperature-dependent wettability.

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Section: Simulation Methodsmentioning

confidence: 99%

Molecular Insight into Bubble Nucleation on the Surface with Wettability Transition at Controlled Temperatures

et al. 2021

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“…Jabbari 30 investigated the heat transfer between liquid and carbon-based particles, and the results showed that the thermal resistance decreases with increasing solid–liquid interaction. Cao 31 also pointed out that the hydrophilic surface enhances heat transfer in the solid–liquid interface by MDS. Generally, the influence of wettability on heat transfer is attributed to the change in liquid density at the interface.…”

Section: Introductionmentioning

confidence: 99%

A study of how solid–liquid interactions affect flow resistance and heat transfer at different temperatures based on molecular dynamics simulations

Shi

et al. 2023

Phys. Chem. Chem. Phys.

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“…Previous works have been performed on the evaporative heat transfer of thin film on uniform-temperature substrates [12][13][14], which indicate that the evaporation process can be enhanced by adding nanostructures onto the substrate. Several experimental results showed that micropillar array or nanowire array has a superior wicking ability, which can achieve a liquid replenishment and maintain a stable evaporative heat transfer of liquid film.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Nano Thin Film Evaporation on Hot Spot with Nanopillar Array Based on Molecular Dynamics Simulation

Huang¹,

Liu²,

Liu³

2022

International Conference on Fluid Flow and Thermal Science

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In the nano-thin film evaporation process, the hot spots may experience the local dry out phenomenon, which shows a low heat transfer performance. In present study, one stable evaporation of nano-thin water film on the substrate with different nanopillar structures was investigated using the non-equilibrium molecular dynamics (MD) approach. It shows that the nanopillar array can replenish the hot spot by attracting the surrounding water out of the overheated region, both the stability and performance of evaporative heat transfer can be improved. The effect of the number of nanopillars on the evaporation process was studied. The prediction indicates that evaporation rate is important to the replenishment. With the increasing amount of nanopillars, both the evaporative heat transfer and liquid replenishment ability are improved accordingly. The results in present work can contribute to the thermal control of the hot spot in the embedded liquid cooling technique for the high-power electronic chip.

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Molecular dynamics simulations of the liquid film evaporation heat transfer on different wettability hybrid surfaces at the nanoscale

Cited by 32 publications

References 38 publications

Molecular Insight into Bubble Nucleation on the Surface with Wettability Transition at Controlled Temperatures

Molecular Insight into Bubble Nucleation on the Surface with Wettability Transition at Controlled Temperatures

A study of how solid–liquid interactions affect flow resistance and heat transfer at different temperatures based on molecular dynamics simulations

Investigation of Nano Thin Film Evaporation on Hot Spot with Nanopillar Array Based on Molecular Dynamics Simulation

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