Nonlinear spacial instability of a fluid sheet
Abstract
The mechanism of nonlinear distortion of a fluid sheet leading to atomization is investigated numerically with the use of vortex dynamics and experimentally by means of holography. The configuration investigated consists of a planar fluid sheet emerging from a rectangular slit with and without coflowing air. The numerical model is two-dimensional, inviscid, and includes surface tension effects. The experimental results indicate the existence of well-defined three-dimensional structures. These are formed mainly by the nonlinear interaction of transverse and streamwise disturbances. The transverse disturbances are associated with the Kelvin-Helmholtz instability while the streamwise disturbances appear related to streamwise vortices possibly originating inside the nozzle.
- Publication:
-
AIAA, Aerospace Sciences Meeting
- Pub Date:
- January 1990
- Bibcode:
- 1990aiaa.meetS....R
- Keywords:
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- Flow Distortion;
- Fluid Films;
- Gas Atomization;
- Kelvin-Helmholtz Instability;
- Liquid Surfaces;
- Spray Characteristics;
- Liquid-Liquid Interfaces;
- Mathematical Models;
- Sheets;
- Fluid Mechanics and Heat Transfer