Thermal transport during thin-film argon evaporation over nanostructured platinum surface: A molecular dynamics study

Abstract

Investigation of thermal transport characteristics of thin-film liquid evaporation over nanostructured surface has been conducted using molecular dynamics simulation with particular importance on the effects of the nanostructure configuration for different wall–fluid interaction strengths. The nanostructured surface considered herein comprises wall-through rectangular nanoposts placed over a flat wall. Both the substrate and the nanostructure are of platinum while argon is used as the evaporating liquid. Two different wall–fluid interaction strengths have been considered that essentially emulate both hydrophilic and hydrophobic wetting conditions for three different nanostructure configurations. The argon–platinum molecular system is first equilibrated at 90 K and then followed by a sudden increase in the wall temperature at 130 K that induces evaporation of argon laid over it. Comparative effectiveness of heat and mass transfer for different surface wetting conditions has been studied by calculating the wall heat flux and evaporative mass flux. The results obtained in this study show that heat transfer occurs more easily in cases of nanostructured surfaces than in case of flat surface. Difference in behavior of argon molecules during and after the evaporation process, that is, wall adsorption characteristics, has been found to depend on the surface wetting condition as well as on presence and configuration of nanostructure. A thermodynamic approach of energy balance shows reasonable agreement with the present molecular dynamics study.

Keywords

Evaporation wettability nanostructures molecular dynamics simulation

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References

Maroo

Chung

JN.

Molecular dynamic simulation of platinum heater and associated nano-scale liquid argon film evaporation and colloidal adsorption characteristics. J Colloid Interface Sci 2008; 328: 134–146.

Morshed

AKMM

Paul

Khan

JA.

Effect of nanostructures on evaporation and explosive boiling of thin liquid films: a molecular dynamics study. Appl Phys A 2011; 105: 445–451.

Seyf

Zhang

Molecular dynamics simulation of normal and explosive boiling on nanostructured surface. J Heat Transfer 2013; 135(12): 121503.

Wang

Zhang

Tian

Meng

Numerical experiments on evaporation and explosive boiling of ultra-thin liquid argon film on aluminum nanostructure substrate. Nanoscale Res Lett 2015; 10: 158.

Yamamoto

Matsumoto

Initial stage of nucleate boiling: molecular dynamics investigation. J Therm Sci Technol Jpn 2012; 7: 334–349.

Wang

A molecular dynamics investigation on evaporation of thin liquid films. Int J Heat Mass Transfer 2012; 55: 1218–1225.

Plawsky

Fedorov

Garimella

et al . Nano- and microstructures for thin-film evaporation—a review. Nanosc Microsc Therm 2014; 18: 251–269.

Diaz

Guo

A molecular dynamics study of phobic/philic nano-patterning on pool boiling heat transfer. Heat Mass Transfer 2017; 53: 1061–1071.

Zhang

Molecular dynamics simulation of condensation on nanostructured surface in a confined space. Appl Phys A 2016; 122: 496.

10.

Hens

Agarwal

Biswas

Nanoscale study of boiling and evaporation in a liquid Ar film on a Pt heater using molecular dynamics simulation. Int J Heat Mass Transfer 2014; 71: 303–312.

11.

Lennard-Jones

Devonshire

AF.

Critical phenomena in gases. I. Proc R Soc Lond A Math Phys Sci 1937; 163: 53–70.

12.

LAMMPS user’s manual. Sandia National Laboratories, http://lammps.sandia.gov/ (accessed 14 November 2016).

13.

Humphrey

Dalke

Schulten

VMD: visual molecular dynamics. J Mol Graph 1996; 117(1): 1–19.

14.

Gambill

Lienhard

JH.

An upper bound for the critical boiling heat flux. J Heat Transfer 1989; 111: 815–818.

15.

Nagayama

Kawagoe

Tokunaga

et al . On the evaporation rate of ultra-thin liquid film at the nanostructured surface: a molecular dynamics study. Int J Therm Sci 2010; 49: 59–66.