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Shape effect of hot droplets on fragmentation.

Nobuyoshi Komatsu¹, Takashi Abe

¹Department of Aeronautics and Astronautics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, Japan. n-komatsu@gd.isas.jaxa.jp

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|October 4, 2005

Summary

The shape of hot droplets significantly impacts fragmentation, with more elongated shapes producing smaller clusters. This shape effect is less pronounced in larger droplets.

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Area of Science:

Thermodynamics
Statistical Mechanics
Computational Physics

Background:

Understanding droplet fragmentation is crucial for various physical and chemical processes.
The influence of initial droplet shape on fragmentation dynamics is not fully understood, especially for small systems.

Purpose of the Study:

To investigate the fragmentation dynamics of small hot droplets.
To determine the effect of initial droplet shape on fragmentation outcomes.
To explore the role of droplet size on shape-dependent fragmentation.

Main Methods:

Classical molecular dynamics simulations were employed.
Simulations focused on hot droplets in the supercritical phase with N < 10^3 particles.
Analysis centered on cluster size distribution and the largest cluster's behavior.

Main Results:

Droplet fragmentation leads to a largest cluster approaching a quasistable state near the triple point.
Initial droplet shape significantly influences fragmentation: prolate shapes yield smaller largest clusters and more numerous small clusters.
The observed shape effect diminishes for larger droplets (N > 10^3 particles).

Conclusions:

Initial droplet shape is a critical factor in fragmentation dynamics for small supercritical droplets.
The triple point represents a significant quasistable state in the fragmentation process.
For large droplets, the influence of initial shape on fragmentation becomes negligible.

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