Spray impact: Rim transverse instability initiating fingering and splash, and description of a secondary spray (CROSBI ID 260275)
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Podaci o odgovornosti
Roisman, Ilia ; Horvat, Kristijan ; Tropea, Cam
engleski
Spray impact: Rim transverse instability initiating fingering and splash, and description of a secondary spray
In this paper, normal spray impact onto a rigid wall, leading to the formation of secondary spray, is considered. The mechanism of splash is explained by the bending instability of a rim bounding a free liquid sheet. The linear stability analysis of the rim is performed in the framework of the long-wave, quasi-one- dimensional approach. The rim instability is caused by the moment of forces associated with the inertia of the liquid entering the rim. Next, two components of the drop velocity and their diameter, as well as various flux density vectors (number, volume, mass fluxes) and tensors (momentum flux), are measured using a phase Doppler instrument. It is shown that the viscous length scale of drop impact can be used in describing the splash threshold, diameter of secondary droplets, and their velocity. Consequently, a closed semi-empirical model for the secondary spray has been proposed and validated using a numerical simulation of spray transport based on an Euler-Lagrange approach.
spray impact, rim transverse instability
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Podaci o izdanju
18 (102104)
2006.
102104
12
objavljeno
1070-6631
1089-7666
10.1063/1.2364187
Povezanost rada
Interdisciplinarne prirodne znanosti