Document Type

Article

Date

2011

Embargo Period

2-3-2012

Keywords

Capillary height, Critical film thickness, Evaporating meniscus, Heat transfer rate, Liquid argon, Liquid pressure, Molecular dynamics simulations, Nano scale, Negative pressures

Language

English

Disciplines

Engineering | Mechanical Engineering | Nanoscience and Nanotechnology

Description/Abstract

This study aims at understanding the characteristics of negative liquid pressures at the nanoscale using molecular dynamics simulation. A nano-meniscus is formed by placing liquid argon on a platinum wall between two nanochannels filled with the same liquid. Evaporation is simulated in the meniscus by increasing the temperature of the platinum wall for two different cases. Non-evaporating films are obtained at the center of the meniscus. The liquid film in the non-evaporating and adjacent regions is found to be under high absolute negative pressures. Cavitation cannot occur in these regions as the capillary height is smaller than the critical cavitation radius. Factors which determine the critical film thickness for rupture are discussed. Thus, high negative liquid pressures can be stable at the nanoscale, and utilized to create passive pumping devices as well as significantly enhance heat transfer rates.

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