Mechanism of the Large Surface Deformation Caused by Rayleigh-Taylor Instability at Large Atwood Number

DOI: 10.4236/jamp.2014.210110   PDF   HTML   XML   2,544 Downloads   3,049 Views   Citations

Abstract

Studying the dynamical behaviors of the liquid spike formed by Rayleigh-Taylor instability is important to understand the mechanisms of liquid atomization process. In this paper, based on the information on the velocity and pressure fields obtained by the coupled-level-set and volume-of- fluid (CLSVOF) method, we describe how a freed spike can be formed from a liquid layer under falling at a large Atwood number. At the initial stage when the surface deformation is small, the amplitude of the surface deformation increases exponentially. Nonlinear effect becomes dominant when the amplitude of the surface deformation is comparable with the surface wavelength (~0.1λ). The maximum pressure point, which results from the impinging flow at the spike base, is essential to generate a liquid spike. The spike region above the maximum pressure point is dynamically free from the bulk liquid layer below that point. As the descending of the maximum pressure point, the liquid elements enter the freed region and elongate the liquid spike to a finger-like shape.

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Li, Y. and Umemura, A. (2014) Mechanism of the Large Surface Deformation Caused by Rayleigh-Taylor Instability at Large Atwood Number. Journal of Applied Mathematics and Physics, 2, 971-979. doi: 10.4236/jamp.2014.210110.

Conflicts of Interest

The authors declare no conflicts of interest.

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