Numerical Simulation of Single Drop Impingement onto a Plane Liquid Surface

Content Provider	Semantic Scholar
Author	Okawa, Tomio
Copyright Year	2008
Abstract	Systematic numerical simulations were carried out to investigate the effects of target film thickness and impingement angle on the process of crown formation following the single drop impingement. A part of liquid originally included in the inner region of crown was transported to the outer region when the liquid film was thick, while the liquid transport was negligible for sufficiently thin films. Inhibition of liquid transport resulted in a rise of impact pressure, an increase in liquid velocity in a crown wall, and a decrease in crown wall thickness. This suggested that the reduction of film thickness leads to an enhancement of splashing of secondary drops since the crown wall is destabilized. It was also confirmed that the pressure rise at the bottom wall is mitigated noticeably if the target liquid film is sufficiently thick. In the case of oblique impact, not only the normal component but also the tangential component of impact velocity was influential in determining the impact pressure and the liquid velocity in a liquid sheet formed during the impact process. This was considered one of the main reasons that the deposition-splashing limit is not dominated by the normal component but the total momentum vector of impact velocity. It was also shown that the elongation of liquid sheet is restricted in the case of very oblique impact since the liquid sheet is directed downward and hence collides with the surface of target liquid film. Paper ID ILASS08-9-3
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.ilasseurope.org/ICLASS/ILASS2008_COMO/file/papers/9-3.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article