Experimental study on coherent structures by particles suspended in half-zone thermocapillary liquid bridges: Review

Coherent structures by the particles suspended in the half-zone thermocapillary liquid bridges via experimental approaches are introduced. General knowledge on the particle accumulation structures (PAS) is described, and then the spatial-temporal behaviours of the particles forming the PAS are illustrated with the results of the two- and three-dimensional particle tracking. Variations of the coherent structures as functions of the intensity of the thermocapillary effect and the particle size are introduced by focusing on the PAS of the azimuthal wave number m = 3. Correlation between the particle behaviour and the ordered flow structures known as the Kolmogorov-Arnold-Moser tori is discussed. Recent works on the PAS of m = 1 are briefly introduced.