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Updated: Jun 16, 2025

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Coherent structures formed by small particles in traveling-wave flows.
Shogo Sensui1, Shin Noguchi1, Keiichiro Kato1
1Division of Mechanical and Aerospace Engineering, School of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
Researchers experimentally verified a phase locking model for coherent structure formation in liquid bridges. This study confirms synchronous coupling of toroidal vortex and traveling waves for low-Stokes-number particles.
Area of Science:
- Fluid dynamics
- Soft matter physics
- Nonlinear dynamics
Background:
- The "phase locking model" proposes how low-Stokes-number particles form one-dimensional coherent structures.
- Thermocapillary liquid bridges are a relevant system for studying particle dynamics in fluid flows.
Purpose of the Study:
- To experimentally verify the phase locking model in thermocapillary liquid bridges.
- To investigate the formation of coherent structures by low-Stokes-number particles in time-periodic flows.
- To explore coherent structures with rational wave numbers in the azimuthal direction.
Main Methods:
- Experimental setup involving thermocapillary liquid bridges.
- Observation of particle behavior and structure formation under time-periodic flow conditions.
- Analysis of the synchronous coupling between toroidal vortex and traveling waves.
Main Results:
- Experimental verification of the phase locking model for coherent structure formation.
- Demonstration of synchronous coupling between toroidal vortex and azimuthal traveling waves for a range of azimuthal wave numbers (m).
- Experimental observation of proposed coherent structures with rational wave numbers in the azimuthal direction.
Conclusions:
- The phase locking model is experimentally validated in thermocapillary liquid bridges.
- Synchronous coupling is a key mechanism for coherent structure formation in these systems.
- New types of coherent structures with rational wave numbers have been identified and experimentally confirmed.
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