Molecular dynamics study of wettability and pitch effects on maximum critical heat flux in evaporation and pool boiling heat transfer

Diaz, Ricardo; Guo, Zhixiong

doi:10.1080/10407782.2017.1412710

Cited by 57 publications

(11 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, phase change of an argon liquid over a nanostructured biphilic substrate was studied by Chen et al [19] whereas Diaz and Guo [21] conducted boiling simulation of liquid argon placed on a horizontal substrate attached to vertical pillars. Measuring the critical heat flux when varying the pillar arrangement (particularly distance) and surface wettability it was concluded that the critical heat flux increases when increasing the distance between the pillars or increasing the degree of hydrophilic chemistry of the surface (i.e.…”

Section: Introductionmentioning

confidence: 99%

Effects of surface nanostructure and wettability on pool boiling: A molecular dynamics study

Shahmardi¹,

Tammisola²,

Chinappi³

et al. 2020

Preprint

View full text Add to dashboard Cite

We study the role of surface topology, surface chemistry, and wall superheat temperature on the onset of boiling, bubble nucleation and growth, and the possible formation of an insulating vapour film by means of large-scale MD simulations. In the numerical experiments, we control the system pressure by imposing a constant force on a moving piston. The simulations reveal that the presence of a nanostructure triggers the bubble formation, determines the nucleation site and facilitates the energy transfer from the hot substrate to the water.The surface chemistry, on the other hand, governs the shape of the formed bubble. A hydrophilic surface chemistry accelerates the bubble nucleation, however, decelerates the bubble expansion, thus postponing the formation of the film of vapour. Therefore, a hydrophilic surface provides better energy transfer from the hot wall to the water. By analysing the system energy, we show that irrespective of wall topology and chemistry, there is a wall temperature for which the amount of transferred energy is maximum.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of surface nanostructure and wettability on pool boiling: A molecular dynamics study

Shahmardi¹,

Tammisola²,

Chinappi³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…The latter are promising for the creation of self-cleaning surfaces [1], as well as for the heat and mass transfer tuning across solid/fluid interfaces [2][3][4]. As another important example, the impact of the wettability on the formation of nucleation sites close to the nanostructured solid/fluid interface can be mentioned [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Nano-Texturing on Wetting Properties: Molecular Dynamics Study

et al. 2020

View full text Add to dashboard Cite

Molecular dynamics simulations describing the equilibrium shape of a nanodroplet located on the solid substrate are presented for the cases of a “cylindrical water droplet” on silicon substrates. Several examples of the structuration of the solid substrate surface are simulated, i.e.: atomistic flat substrate and substrates with ordered nanopillars and nanopores. The adhesives forces between molecules of the substrate and the fluid are modified to change the wettability. Three wetting configurations are considered in this work for the smooth surface: (i) hydrophilic (0 = 30∘), (ii) hydrophobic (0 = 136∘), and (iii) an intermediate regime (0 = 80∘). Further, the dependence of the wetting angle as a function of the surface state is studied in details for the above-mentioned configurations.

show abstract

“…The nanofilm boiling and CHF has been studied for liquid argon using the widely‐accepted standard 12–6 Lennard–Jones (L–J) potential in many MD studies . However, to the best of the authors’ knowledge the nanofilm boiling and CHF on a graphene‐coated surface has not been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Benefitting from the atomic‐sized level and sub‐femtosecond timescale understanding of phenomena, classic molecular dynamics (MD) have been widely accepted as a method to investigate the micro–nano scale heat transfer . As previously reported in MD studies, the nanofilm liquid boiling on a solid surface shows distinct features from macroscopic pool boiling.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Nanofilm Boiling on Graphene‐Coated Surface

Tang

Zhang

Lin

et al. 2019

Advcd Theory and Sims

View full text Add to dashboard Cite

Molecular dynamics (MD) simulations are conducted to investigate the effect of graphene coating on nanofilm boiling on an atomically smooth surface. Transition of boiling modes from normal evaporation to explosive boiling is observed on both bare and graphene-coated surfaces. The onset temperature of explosive boiling on the graphene-coated surface is approximately 170 K, which is extremely close to the value of approximately 160 K on the bare surface. A hydrophobic surface is also artificially fabricated to verify the effect of surface wettability on nanofilm boiling and the significance of graphene coating. The onset temperature of explosive boiling on the hydrophobic surface is much higher than that on the hydrophilic and graphene-coated surfaces. Additionally, the critical heat flux of the nanofilm boiling on the graphene-coated surface is slightly lower than that on the bare hydrophilic surface. Results confirm that graphene coating is almost useless, and even harmful to the heat transfer enhancement of the nanofilm boiling. Simulation MethodThree simulation systems, namely hydrophilic Cu, hydrophobic Cu, and graphene-coated Cu systems, are developed and shown in Figure 1. The initial configurations of the three systems are cuboid confinements with the same size of 8.39 nm (x) × 9.68 nm

show abstract

Molecular dynamics study of wettability and pitch effects on maximum critical heat flux in evaporation and pool boiling heat transfer

Cited by 57 publications

References 41 publications

Effects of surface nanostructure and wettability on pool boiling: A molecular dynamics study

Effects of surface nanostructure and wettability on pool boiling: A molecular dynamics study

Effect of Surface Nano-Texturing on Wetting Properties: Molecular Dynamics Study

Molecular Dynamics Simulation of Nanofilm Boiling on Graphene‐Coated Surface

Contact Info

Product

Resources

About