TY - JOUR
T1 - Maximal air bubble entrainment at liquid-drop impact
AU - Bouwhuis, Wilco
AU - van der Veen, Roeland C.A.
AU - Tran, Tuan
AU - Keij, Diederik L.
AU - Winkels, Koen G.
AU - Peters, Ivo R.
AU - van der Meer, Devaraj
AU - Sun, Chao
AU - Snoeijer, Jacco H.
AU - Lohse, Detlef
PY - 2012
Y1 - 2012
N2 - At impact of a liquid drop on a solid surface, an air bubble can be entrapped. Here, we show that two
competing effects minimize the (relative) size of this entrained air bubble: for large drop impact velocity and large droplets, the inertia of the liquid flattens the entrained bubble, whereas for small impact velocity and small droplets, capillary forces minimize the entrained bubble. However, we demonstrate experimentally, theoretically, and numerically that in between there is an optimum, leading to maximal air bubble entrapment. For a 1.8 mm diameter ethanol droplet, this optimum is achieved at an impact velocity of 0:25 m=s. Our results have a strong bearing on various applications in printing technology, microelectronics, immersion lithography, diagnostics, or agriculture
AB - At impact of a liquid drop on a solid surface, an air bubble can be entrapped. Here, we show that two
competing effects minimize the (relative) size of this entrained air bubble: for large drop impact velocity and large droplets, the inertia of the liquid flattens the entrained bubble, whereas for small impact velocity and small droplets, capillary forces minimize the entrained bubble. However, we demonstrate experimentally, theoretically, and numerically that in between there is an optimum, leading to maximal air bubble entrapment. For a 1.8 mm diameter ethanol droplet, this optimum is achieved at an impact velocity of 0:25 m=s. Our results have a strong bearing on various applications in printing technology, microelectronics, immersion lithography, diagnostics, or agriculture
KW - METIS-291559
KW - IR-82835
U2 - 10.1103/PhysRevLett.109.264501
DO - 10.1103/PhysRevLett.109.264501
M3 - Article
SN - 0031-9007
VL - 109
JO - Physical review letters
JF - Physical review letters
IS - 26
M1 - 264501
ER -