TY - CHAP
T1 - Dynamics of Droplets
AU - Kitahata, Hiroyuki
AU - Yoshinaga, Natsuhiko
AU - Nagai, Ken H.
AU - Sumino, Yutaka
N1 - Funding Information:
We are grateful to Takao Ohta and Kenichi Yoshikawa for helpful discussions. The present studies are partly supported by PRESTO, JST (Alliance for Breakthrough between Mathematics and Sciences) to H. K., Grants-in-Aid for young scientists to H. K. (nos. 21740282 and 24740256), to N. Y. (no. 23740317), to Y. S. (no. 24740287) from MEXT, Japan, and JSPS fellowship for young scientists to K. H. N. (no. 23-1819).
PY - 2013
Y1 - 2013
N2 - In this chapter, we consider the motion of a droplet and the surrounding flow accompanied by the motion. Our specific attention is on the spontaneous and autonomous motion of a droplet. Such a system has no applied external force and no asymmetry imposed a priori. Nevertheless, the droplet moves by consuming energy and by breaking the symmetry of the system. The phenomenon reminds us of biological systems that can also move spontaneously. These systems, which are called self-propulsive systems, have recently been extensively studied after several model experiments were proposed using chemical reactions. The mechanism of such motion is less clear, though theoretical and computational studies have revealed several novel aspects of the motion in contrast with the motion under a given asymmetry. We discuss recently developed experimental systems. Then, we focus on a suspended droplet that swims, and explain how the result can be analyzed in terms of hydrodynamics by using the concept of surface tension. Finally, we apply the method to the analysis of a swimming suspended droplet induced propelled by a chemical pattern generated inside the droplet.
AB - In this chapter, we consider the motion of a droplet and the surrounding flow accompanied by the motion. Our specific attention is on the spontaneous and autonomous motion of a droplet. Such a system has no applied external force and no asymmetry imposed a priori. Nevertheless, the droplet moves by consuming energy and by breaking the symmetry of the system. The phenomenon reminds us of biological systems that can also move spontaneously. These systems, which are called self-propulsive systems, have recently been extensively studied after several model experiments were proposed using chemical reactions. The mechanism of such motion is less clear, though theoretical and computational studies have revealed several novel aspects of the motion in contrast with the motion under a given asymmetry. We discuss recently developed experimental systems. Then, we focus on a suspended droplet that swims, and explain how the result can be analyzed in terms of hydrodynamics by using the concept of surface tension. Finally, we apply the method to the analysis of a swimming suspended droplet induced propelled by a chemical pattern generated inside the droplet.
KW - Hydrodynamics
KW - Interface
KW - Marangoni effect
KW - Nonequilibrium systems
KW - Reaction-diffusion systems
KW - Self-propulsion
KW - Surface tension
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U2 - 10.1016/B978-0-12-397014-5.00003-1
DO - 10.1016/B978-0-12-397014-5.00003-1
M3 - Chapter
AN - SCOPUS:84882664758
SN - 9780123970145
SP - 85
EP - 118
BT - Pattern Formations and Oscillatory Phenomena
PB - Elsevier Inc.
ER -