Parallel Molecular Dynamics Simulation of Head-on Collision of Two Nanoscale Droplets with Low Relative Speed

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Abstract:

Head-on collision of two equal-size nanoscale argon droplets with relative speed less than 10 m/s is investigated using a parallel cellular molecular dynamics code (PCMD). Previous studies showed that bouncing only occurred within a narrow range of head-on collision conditions, which was mainly attributed to the existence of background gas between the droplets. However, through simulations by thoroughly varying the head-on collision conditions, we have found that bouncing can easily occur as long as the relative speed is less than a critical value, which the magnitude strongly depends on the background gas pressure. This critical value of relative speed generally decreases with increasing background gas pressure. We attribute the bouncing between nanoscale droplets to the vaporizing atoms emitting from the head-on surfaces of the two droplets, which becomes the dominated factor under vacuum condition.

Keywords: HEAD-ON COLLISION; NANOSCALE DROPLETS; PARALLEL MDSIMULATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jctn.2009.1005

Publication date: January 1, 2009

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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