Effect of nanostructures on evaporation and explosive boiling of thin liquid films: a molecular dynamics study

Morshed, A. K. M. M.; Paul, T. C.; Khan, Jamil A.

doi:10.1007/s00339-011-6577-8

Cited by 83 publications

(33 citation statements)

References 15 publications

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“…Figure 2 shows the number density profile of argon on hydrophilic platinum surface during the equilibrium period. The number density profile is compared with the phase diagram of the Lenard Jones system [10] and previous studies [6][7], from the comparison, it can be said that the system is indeed in thermal equilibrium. For the silver and aluminum surface and hydrophobic case, the number density profiles of argon during equilibrium period show the similar characteristics as shown in Fig.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…Morshed et al [6] studied the effect of nanostructures on evaporation and explosive boiling of thin liquid films through molecular dynamics simulation considering cylindrical nanoposts. Seyf and Zhang [7] studied the effect of spherical nanostructure and confirmed the significant effect of size and shape of the nanostructures on explosive boiling.…”

Section: Introductionmentioning

confidence: 99%

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Phase Change Characteristics of Ultra-Thin Liquid Argon Film over different Flat Substrates at High Wall Superheat for Hydrophilic/Hydrophobic Wetting Condition: A Non-Equilibrium Molecular Dynamics Study

et al. 2017

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Abstract:Non-equilibrium molecular dynamics simulations have been conducted to understand the effect of solid-liquid interfacial wettability and surface material on the phase change phenomena of the thin liquid argon film placed over flat substrate at high wall superheat. The molecular system consists of a three phase simulation domain involving solid wall, liquid argon and argon vapor. After the system is thermally equilibrated at 90K and kept in equilibrium for a while, a high wall superheat (250K that is far above the critical temperature of argon) is induced at the liquid boundary so that the liquid undergoes ultrafast heating. Both hydrophilic and hydrophobic surfaces were considered in the present study in order to observe the effect of surface wettability on phase change characteristics for three different solid substrate materials namely, Platinum (Pt), Silver (Ag) and Aluminium (Al). Results obtained in the present study are discussed in terms of transient atomic distribution inside system domain, heat flux characteristics across the solid-liquid interface together with evaporative mass flux from liquid argon. Simulation results show that, depending on the surface wetting condition, the phase change process appears to be very different (explosive/ diffusive) for all three substrate materials under consideration. Among three materials considered herein, Al is found to offer the least favourable condition for phase change process while Pt and Ag show similar heat and mass transfer characteristics for both hydrophilic and hydrophobic wetting conditions. Surface wettability effect is found to be more prominent than the effect of substrate material in thin film liquid phase change phenomena.

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Section: Simulation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase Change Characteristics of Ultra-Thin Liquid Argon Film over different Flat Substrates at High Wall Superheat for Hydrophilic/Hydrophobic Wetting Condition: A Non-Equilibrium Molecular Dynamics Study

et al. 2017

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“…It should be pointed out that the interaction between aluminum atoms is not considered. Instead, many artificial Al-Al harmonic bonds are built for the plate and nanostructures to introduce an Al-Al spring-like interaction [5,18]. An artificial harmonic bond is created by connecting neighboring aluminum atoms that are within the shortest distance of 3 Å.…”

Section: Simulation Modelmentioning

confidence: 99%

“…It was shown that very high heat flux and evaporation rates as well as significant increases in pressure occurred after the formation of a nonevaporating film near the solid surface. Morshed et al [18] simulated boiling of a liquid argon thin film absorbed on a platinum substrate whose surface is structured by cylindrical nanostructures. They reported that their nanostructure had a significant effect on vaporization/boiling of the liquid thin film.…”

Section: Subscriptsmentioning

confidence: 99%

Molecular Dynamics Simulation on Rapid Boiling of Thin Water Films on Cone-Shaped Nanostructure Surfaces

Mao

Tang

et al. 2015

Nanoscale and Microscale Thermophysical Engineering

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Molecular dynamics simulations (MDS) are employed to investigate the effects of the size of a nanocone on rapid boiling of an ultrathin liquid water film that is suddenly heated by a hot aluminum plate. A physically sound thermostat is applied to control the temperature of the aluminum plate and then to heat the water molecules that are placed on the solid surface. The results show that the cone nanostructures drastically enhance heat transfer from the solid aluminum plate to liquid water and the phase change process from liquid water to vapor. They also have significant effects on temperature histories and the density distributions in the system. In all cases studied, the water molecules above the solid surface rapidly boil after contact with an extremely hot aluminum plate and consequently a cluster of liquid water is observed to move upward during the phase change. It is also observed that the separation temperature associated with separation of liquid water film from the solid surface and its final temperature when the system is at equilibrium strongly depend on the height of the nanocone. Furthermore, in all cases, at a specific time after beginning of boiling, a nonvaporized water molecular layer is formed above the surface of the aluminum plate.

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“…Yu and Wang [4] performed nonequilibrium molecular dynamics (NEMD) simulation to study the evaporation of the thin film, equilibrium vapor pressure as well as non-evaporating liquid layer in a Nano-scale triple-phase system. Morshed et al [5] performed molecular dynamics simulation to study the effect of nanostructures on evaporation and explosive boiling of thin liquid films. Maroo and Chung [6] performed molecular dynamics simulation of platinum heater and associated Nano-scale liquid argon film evaporation and colloidal adsorption characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effect of nanostructured surface configuration on evaporation and condensation characteristics of thin film liquid argon in a nano-scale confinement

Kuri

Rakibuzzaman

Sabah

et al. 2017

AIP Conference Proceedings

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Abstract. Molecular dynamics simulation has been carried out to go through the evaporation and condensation characteristics of thin liquid argon film in nanoscale confinement having nanostructured boundary. Nanoscale confinement under consideration consists of hot and cold parallel platinum plates at the bottom and top end of a model cuboid inside which the fluid domain comprised of liquid argon film at the bottom plate and vapor argon in between liquid argon and upper plate of the confinement. Three different confinement configurations have been considered here: (i) Both platinum plates are flat, (ii) Upper plate consisting of transverse slots and (iii) Both plates consisting of transverse slots. The height of the slots is 1.5 nm. Considering hydrophilic nature of top and bottom plates, two different high temperatures of the hot wall was set and an observation was made. For all the structures, equilibrium molecular dynamics (EMD) was performed to reach equilibrium state at 90 K. Then the lower wall is set to two different temperatures like 110 K and 250 K for all three models to perform non-equilibrium molecular dynamics (NEMD). Various system characteristics such as atomic distribution, wall heat flux, evaporative mass flux etc. have been obtained and discussed to have a clear understanding of the effect of nanotextured surface on phase change phenomena.

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Effect of nanostructures on evaporation and explosive boiling of thin liquid films: a molecular dynamics study

Cited by 83 publications

References 15 publications

Phase Change Characteristics of Ultra-Thin Liquid Argon Film over different Flat Substrates at High Wall Superheat for Hydrophilic/Hydrophobic Wetting Condition: A Non-Equilibrium Molecular Dynamics Study

Phase Change Characteristics of Ultra-Thin Liquid Argon Film over different Flat Substrates at High Wall Superheat for Hydrophilic/Hydrophobic Wetting Condition: A Non-Equilibrium Molecular Dynamics Study

Molecular Dynamics Simulation on Rapid Boiling of Thin Water Films on Cone-Shaped Nanostructure Surfaces

Effect of nanostructured surface configuration on evaporation and condensation characteristics of thin film liquid argon in a nano-scale confinement

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