TY - JOUR
T1 - How merging droplets jump off a superhydrophobic surface
T2 - Measurements and model
AU - Mouterde, Timothé
AU - Nguyen, Thanh Vinh
AU - Takahashi, Hidetoshi
AU - Clanet, Christophe
AU - Shimoyama, Isao
AU - Quéré, David
N1 - Funding Information:
We thank the Japanese Society for Promotion of Science that made possible this collaboration with a Summer Program fellowship. We thank the Direction Générale de l'Armement (DGA) for contributing to the financial support, Rose-Marie Sauvage and Thierry Midavaine for their constant interest, and Thales for cofunding this project. The photolithography masks were made using the University of Tokyo VLSI Design and Education Center (VDEC)'s 8 in. EB writer F5112+VD01 donated by ADVANTEST Corporation. This work was partially supported by JSPS KAKENHI Grant No. 25000010.
Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/11
Y1 - 2017/11
N2 - We investigate how drops merging on a nonwettable surface jump off this surface, for both symmetric and asymmetric coalescences. For this purpose, we design and build a microelectromechanical system sensor able to quantify forces down to the micro-Newton scale at a high acquisition rate (200 kHz). Using this device, we perform direct force measurements of self-propelled droplets coupled to high-speed imaging. Experimental data show that the total momentum of the drop after coalescence mainly depends on the size of the smaller drop. Exploiting this finding, we quantitatively predict the takeoff speed of jumping drop pairs and show how to correct the usual argument based on energy conservation.
AB - We investigate how drops merging on a nonwettable surface jump off this surface, for both symmetric and asymmetric coalescences. For this purpose, we design and build a microelectromechanical system sensor able to quantify forces down to the micro-Newton scale at a high acquisition rate (200 kHz). Using this device, we perform direct force measurements of self-propelled droplets coupled to high-speed imaging. Experimental data show that the total momentum of the drop after coalescence mainly depends on the size of the smaller drop. Exploiting this finding, we quantitatively predict the takeoff speed of jumping drop pairs and show how to correct the usual argument based on energy conservation.
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U2 - 10.1103/PhysRevFluids.2.112001
DO - 10.1103/PhysRevFluids.2.112001
M3 - Article
AN - SCOPUS:85038439011
SN - 2469-990X
VL - 2
JO - Physical Review Fluids
JF - Physical Review Fluids
IS - 11
M1 - 114303
ER -
