Initial Stage of Nucleate Boiling: Molecular Dynamics Investigation

Yamamoto, Takahiro; Matsumoto, Mitsuhiro

doi:10.1299/jtst.7.334

Cited by 81 publications

(32 citation statements)

References 22 publications

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“…The profiles of heat flux of Fig. 11 shows excellent agreement with the study performed by the Yamamoto and Matsumoto [14]. Heat Flux profiles from Fig.…”

Section: Pt-surfacesupporting

confidence: 79%

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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“…The profiles of heat flux of Fig. 11 shows excellent agreement with the study performed by the Yamamoto and Matsumoto [14]. Heat Flux profiles from Fig.…”

Section: Pt-surfacesupporting

confidence: 79%

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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“…This time gap can be explained in terms of “inception time” (waiting time before the transition to film‐like boiling) introduced in . Since inception time decreases with the increase of wettability, the evaporative mass flux decreases earlier for surface A in case 2 compared with case 1. For surface E, inception time is greater than 5.1 ns.…”

Section: Resultsmentioning

confidence: 99%

“…Among the biphilic surfaces, it is observed that with the decrease of philic‐phobic pattern bandwidth the maximum value of heat flux is increased. Bubbles generate over the hydrophilic surface earlier than the hydrophobic surface .…”

Section: Resultsmentioning

confidence: 99%

“…They reported that the heat transfer is remarkably enhanced by the decrease in contact angle. Yamamoto and Matsumoto in their MD simulation changed the wettability of the heating surface by varying the energy parameter acting between solid and liquid. They found the inception time of bubble nucleation is dependent on the wettability of the surface.…”

Section: Introductionmentioning

confidence: 99%

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Atomic insights of thin‐film evaporation over biphilic surfaces: Effect of philic‐phobic patterning and wettability contrast

Hasan

Paul

Rownak

et al. 2019

Heat Trans. Asian Res.

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Molecular dynamics simulations have been carried out to investigate the effect of philic-phobic patterning and wettability contrast of biphilic (surface with interlaced hydrophilic and hydrophobic segments) surfaces on thin-film evaporation and compare its performance with the surfaces with uniform wettability, ie, hydrophilic/hydrophobic. Thin liquid film of argon with 3 nm film thickness is placed over platinum surface. After equilibrating the system at 90 K, the temperature of the platinum wall is raised to two different temperatures 110 and 130 K to study the effect of wall superheat temperature. The results obtained in this study indicate that biphilic surface offers wall heat flux and evaporative mass flux close to the hydrophilic surface. With the decrease of philic-phobic pattern bandwidth of biphilic and superbiphilic surface, the maximum value of evaporative mass flux and wall heat flux increases. Also higher wettability contrast among hydrophilic and hydrophobic region offers higher value of wall heat flux and evaporative mass flux. The boiling inception time decreases with the decrease of philic-phobic pattern bandwidth and increase of wettability contrast therefore, the nonevaporating layer appears earlier in case of lower philic-phobic pattern bandwidth and higher wettability contrast. K E Y W O R D S biphilic/hybrid surface, bubble inception time, nonevaporating layer, surface wettability, wettability contrast

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“…When nucleation is influenced by temperature, like in case of boiling, the change in temperature causes changes in local pressure that favors formation of vapor nuclei. 1 In supersaturated systems, however, the nucleation happens because of the system's attempt to recover equilibrium by phase separation at a constant temperature. Gas evolution on electrodes is a good example of nucleation driven by supersaturation, the continuous redox reactions on the electrodes leading to supersaturation of the liquid with gas, promoting the formation of the gas bubble.…”

mentioning

confidence: 99%

Explanation of Bubble Nucleation Mechanisms: A Gradient Theory Approach

Vachaparambil

Einarsrud

2018

J. Electrochem. Soc.

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A Helmholtz free energy description of the four nucleation mechanisms used to explain the bubble nucleation in electrochemical systems is presented. The mechanisms are compared based on the nucleation energy barrier and critical nuclei radius. The theoretical analysis sheds light on the effect of parameters like contact angle on the electrode surface and pre-existing gas bubbles on nucleation energy barrier. A free energy based description of surface tension (planar interface) is also obtained from the thermodynamic framework.

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Initial Stage of Nucleate Boiling: Molecular Dynamics Investigation

Cited by 81 publications

References 22 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

Atomic insights of thin‐film evaporation over biphilic surfaces: Effect of philic‐phobic patterning and wettability contrast

Explanation of Bubble Nucleation Mechanisms: A Gradient Theory Approach

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