199 citations · 833 across the 38 of their papers we have counts for
13 papers · 1 filter
Mathematical modeling for the synchronization of two interacting active rotors
Hiroyuki Kitahata, Yuki Koyano
We investigate the synchronization of active rotors. A rotor is composed of a free-rotating arm with a particle that releases a surface-active chemical compound. It exhibits self-r…
Two-dimensional hydrodynamic simulation for synchronization in coupled density oscillators
Nana Takeda, Hiroaki Ito, Hiroyuki Kitahata
A density oscillator is a fluid system in which oscillatory flow occurs between different density fluids through the pore connecting them. We investigate the synchronization in cou…
Imperfect bifurcation in the rotation of a propeller-shaped camphor rotor
Yuki Koyano, Hiroyuki Kitahata
We investigated the bifurcation structure on the self-propelled motion of a camphor rotor at a water surface. The center of the camphor rotor was fixed by the axis, and it showed r…
Diffusion enhancement in a levitated droplet via oscillatory deformation
Yuki Koyano, Hiroyuki Kitahata, Koji Hasegawa +5
Recent experimental results indicate that mixing is enhanced by a reciprocal flow induced inside a levitated droplet with an oscillatory deformation [T. Watanabe et al. Sci. Rep. 8…
Spontaneous motion of a camphor particle with a triangular modification from a circle
Hiroyuki Kitahata, Yuki Koyano
The spontaneous motion of a camphor particle with a slight modification from a circle is investigated. The effect of the shape on the motion is examined by the perturbation method.…
Bifurcation analysis of a density oscillator using two-dimensional hydrodynamic simulation
Nana Takeda, Naoko Kurata, Hiroaki Ito +1
A density oscillator exhibits limit-cycle oscillations driven by the density difference of the two fluids. We performed two-dimensional hydrodynamic simulations with a simple model…
Two floating camphor particles interacting through lateral capillary force
Yuhei Hirose, Yusuke Yasugahira, Mamoru Okamoto +4
We consider a mathematical model for a two-particle system driven by the spatial gradient of a concentration field of chemicals with conservative attractive interactions in one dim…
Power law observed in the motion of an asymmetric camphor boat under viscous conditions
Michiko Shimokawa, Masashi Oho, Kengo Tokuda +1
We investigated the velocity of an asymmetric camphor boat moving on aqueous solutions with glycerol. The viscosity was controlled by using several concentrations of glycerol into…
Oscillatory Motion of a Camphor Grain in a One-Dimensional Finite Region
Yuki Koyano, Tatsunari Sakurai, Hiroyuki Kitahata
The motion of a self-propelled particle is affected by its surroundings, such as boundaries or external fields. In this paper, we investigated the bifurcation of the motion of a ca…
Effective diffusion coefficient including the Marangoni effect
Hiroyuki Kitahata, Natsuhiko Yoshinaga
Surface-active molecules supplied from a particle fixed at the water surface create a spatial gradient of the molecule concentration, resulting in Marangoni convection. Convective…
Oscillation of a Rotating Levitated Droplet: Analysis with a Mechanical Model
Hiroyuki Kitahata, Rui Tanaka, Yuki Koyano +7
A droplet of millimeter-to-centimeter scale can exhibit electrostatic levitation, and such levitated droplets can be used for the measurement of the surface tension of the liquids…
General Criteria for Determining Rotation or Oscillation in a Two-dimensional Axisymmetric System
Yuki Koyano, Natsuhiko Yoshinaga, Hiroyuki Kitahata
A self-propelled particle in a two-dimensional axisymmetric system, such as a particle in a central force field or confined in a circular region, may show rotational or oscillatory…
Slowing and stopping of chemical waves in a narrowing canal
Hiroyuki Kitahata, Ryoichi Aihara, Yoshihito Mori +1
The propagation of a chemical wave in a narrow, cone-shaped glass capillary was investigated. When a chemical wave propagates from the wider end to the narrower end, it slows, stop…