Zdjęcie: Collapse of Nanoscopic Void Triggered by Spherically Symmetric Travelling Sound Wave

Collapse of Nanoscopic Void Triggered by Spherically Symmetric Travelling Sound Wave

Molecular-dynamics simulations of the Lennard-Jones fluid (up to 107 atoms) are used to analyze the collapse of a nanoscopic bubble. The collapse is triggered by a traveling sound wave that forms a shock wave at the interface. The peak temperature Tmax in the focal point of the collapse is approximately Ra0, where  is the surface density of energy injected at the boundary of the container of radius R0 and α ≈ 0.4–0.45. For  = 1.6 J/m2 and R0 = 51 nm, the shock wave velocity, which is proportional to √, reaches 3400 m/s (4 times the speed of sound in the liquid); the pressure at the interface, which is proportional to , reaches 10 GPa; and Tmax reaches 40 000 K. The Rayleigh-Plesset equation together with the time of the collapse can be used to estimate the pressure at the front of the shock wave.

  • Autor: Holyst R, Litniewski M, Garstecki P
  • Rok: 2012
  • Źródło: Phys. Rev. E
  • Plik: pobierz

powrót »

en
Created by PONG, design Maciej Szkopański.