Three-dimensional numerical investigation of a droplet impinging normally onto a wall film

Journal Article · Sun Jul 01 04:00:00 EDT 2007 · Journal of Computational Physics

DOI:https://doi.org/10.1016/j.jcp.2006.12.002· OSTI ID:20991597

Nikolopoulos, N ^[1]; Theodorakakos, A ^[2]; Bergeles, G ^[1]

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1. Department of Mechanical Engineering, Nat. Technical University of Athens, 15740 Zografos (Greece)
2. Fluid Research Co., H. Trikoupi 25, Athens, 10681 (Greece)

The paper presents a three-dimensional numerical investigation of a droplet impinging normally onto a wall film. The numerical method is based on the finite volume solution of the Navier-Stokes equations coupled with the volume of fluid method (VOF) and utilizing an adaptive local grid refinement technique for tracking more accurately the liquid-gas interface. The results are compared with available experimental data for integral quantities such as the lamella temporal development. Two mechanisms are identified leading to secondary droplet formation; in the initial and intermediate stages of splashing secondary droplet formation is according to Rayleigh instability while at later times surface tension effects contribute further to secondary atomization. Moreover, the influence of Weber number on the impingement process is investigated and correlations for the diameter and number of secondary droplets are proposed.

• OSTI ID: 20991597
• Journal Information: Journal of Computational Physics, Journal Name: Journal of Computational Physics Journal Issue: 1 Vol. 225; ISSN JCTPAH; ISSN 0021-9991
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOMIZATION
CORRELATIONS
DEPOSITION
DROPLETS
FILMS
IMPINGEMENT
INSTABILITY
INTEGRALS
INTERFACES
MATHEMATICAL SOLUTIONS
NAVIER-STOKES EQUATIONS
SURFACE TENSION
THREE-DIMENSIONAL CALCULATIONS
WALLS