Molecular dynamics simulation of annular flow boiling with the modified Lennard-Jones potential function |
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Authors: | D Toghraie Semiromi A R Azimian |
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Institution: | (1) Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran |
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Abstract: | Molecular dynamics simulation of annular flow boiling in a nanochannel is numerically investigated. In this research, an annular
flow model is developed to predict the superheated flow boiling heat transfer characteristics in a nanochannel. To characterize
the forced annular boiling flow in a nanochannel, an external driving force
F?\textext \overrightarrow {F}_{\text{ext}} ranging from 1 to 12 PN (PN = pico newton) is applied along the flow direction to inlet fluid particles during the simulation.
Based on an annular flow model analysis, it is found that saturation condition and superheat degree have great influences
on the liquid–vapor interface. Also, the results show that due to the relatively strong influence of the surface tension in
small channels, the interface between the liquid film and the vapor core is fairly smooth, and the mean velocity along the
stream-wise direction does not change anymore. Also, it is found that the heat flux values depend on the boundary conditions.
Finally, the Green–Kubo formula is used to calculate the thermal conductivity of liquid Argon. The simulations predict thermal
conductivity of liquid Argon quite well. |
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Keywords: | |
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