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Research Papers: Evaporation, Boiling, and Condensation

Molecular Dynamics Simulation of Normal and Explosive Boiling on Nanostructured Surface

[+] Author and Article Information
Yuwen Zhang

James C. Dowell Professor
Fellow ASME
e-mail: zhangyu@missouri.edu
Department of Mechanical and
Aerospace Engineering,
University of Missouri,
Columbia, MO 65211

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 23, 2013; final manuscript received May 21, 2013; published online October 14, 2013. Assoc. Editor: W. Q. Tao.

J. Heat Transfer 135(12), 121503 (Oct 14, 2013) (8 pages) Paper No: HT-13-1039; doi: 10.1115/1.4024668 History: Received January 23, 2013; Revised May 21, 2013

Molecular Dynamics (MD) simulation is carried out to investigate the normal and explosive boiling of thin film adsorbed on a metal substrate whose surface is structured by an array of nanoscale spherical particles. The molecular system is comprised of the liquid and vapor argon as well as a copper wall. The nanostructures have spherical shape with uniform diameters while the thickness of liquid film is constant. The effects of transvers and longitudinal distances as well as the diameter of nanoparticles are analyzed. The simulation is started from an initial configuration for three phases (liquid argon, vapor argon and solid wall); after equilibrating the system at 90 K, the wall is heated suddenly to a higher temperature that is well beyond the critical temperature of argon. Two different superheat degrees are selected: a moderately high temperature of 170 K for normal evaporation and much higher temperature 290 K for explosive boiling. By monitoring the space and time dependences of temperature and density as well as net evaporation rate, the normal and explosive boiling process on a flat surface with and without nanostructures are investigated. The results show that the nanostructure has significant effect on evaporation/boiling of thin film. The degrees of superheat and size of nanoparticles have significant effects on the trajectories of particles and net evaporation rate. For the cases with nanostructure, liquid responds very quickly and the number of evaporation molecules increases with increasing the size of particles from 1 to 2 nm while it decreases for d = 3 nm.

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Figures

Grahic Jump Location
Fig. 4

Trajectory of atoms for different nanostructure surfaces—high temperature case 290 K

Grahic Jump Location
Fig. 3

Temperature history of argon and solid wall—high temperature case 290 K

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Fig. 2

Three-dimensional view of different size of nanoparticles on the surface

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Fig. 1

Computational domain with three phases

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Fig. 5

Number density—high temperature case 290 K

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Fig. 6

Net evaporation number—high temperature case 290 K

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Fig. 7

Net evaporation number at fast region of evaporation—high temperature case 290 K

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Fig. 8

Temperature history of argon—low temperature case 170 K

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Fig. 9

Temperature history of argon—low temperature case 170 K

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Fig. 10

Number density—high temperature case 170 K

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Fig. 11

Net evaporation number—high temperature case 170 K

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Fig. 12

Net evaporation number at fast region of evaporation—high temperature case 170 K

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