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Droplet impact on a dry surface: triggering the splash with a small obstacle

Published online by Cambridge University Press:  09 February 2005

C. JOSSERAND ,
L. LEMOYNE ,
R. TROEGER  and
S. ZALESKI
C. JOSSERAND
Affiliation:
Laboratoire de Modélisation en Mécanique, case 162, 4 place Jussieu, 75005 Paris, France
L. LEMOYNE
Affiliation:
Laboratoire de Mécanique Physique, 2 pce. gare de ceinture, 78210 St. Cyr, France, josseran@lmm.jussieu.fr
R. TROEGER
Affiliation:
Laboratoire de Mécanique Physique, 2 pce. gare de ceinture, 78210 St. Cyr, France, josseran@lmm.jussieu.fr
S. ZALESKI
Affiliation:
Laboratoire de Modélisation en Mécanique, case 162, 4 place Jussieu, 75005 Paris, France
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Abstract

Droplet impact on a dry solid surface is investigated experimentally. A small obstacle made by layers of adhesive tape is located on the solid surface at some distance from the impact centre. The splashing of the drop starts at the tape, as a sheet of liquid shoots upwards. Angle, speed and dynamics of this liquid sheet are investigated as a function of the distance from the impact centre to the obstacle and its height. Reynolds and Weber numbers are kept constant. Volume-of-fluid simulations reproduce the experiments qualitatively. Measured sheet angles are compared with the predictions of a simple theory.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 524 , 10 February 2005 , pp. 47 - 56
Copyright
© 2005 Cambridge University Press

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