TY - EJOU
AU - Kalantari, Davood
TI - Liquid Droplet Impact onto Flat and Rigid Surfaces: Initial Ejection Velocity of the Lamella
T2 - Fluid Dynamics \& Materials Processing
PY - 2009
VL - 5
IS - 1
SN - 1555-2578
AB - In this paper a theoretical approach is elaborated for modelling the impact and ensuing spreading behaviour of a liquid droplet after its collision with a flat and rigid surface. The major outcomes of such a study can be summarized as follows: 1) The propagating-shock-wave velocity associated with the droplet is not a constant value but depends on the impact velocity and the physical and geometrical properties of the droplet. 2) The initial radial ejection velocity of the lamella is proportional to the shock-wave velocity (ua) and the impact velocity (0) according to the expression (a-u0)1/2. 3) The deceleration behaviour of the initial lamella of fluid has an inverse root squared dependence on time(t-1/2). Finally, for verification of the compatibility, the theoretical results are compared against experimental measurements.
KW - drop impact
KW - lamella
KW - ejection velocity
KW - shock wave
DO - 10.3970/fdmp.2009.005.081