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Effect of suspended particles on spreading of volatile droplet on solid substrate

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Abstract

We have been interested in behaviors of suspended particles in a volatile droplet placed on a smooth substrate. It is known that the particles gather and deposit in the vicinity of the macroscopic contact line of the droplet, which is generally called ‘coffee stain problem’. A convective flow induced by non-uniform evaporation through the interface brings suspended particles toward the pinned contact line in the drying droplet, which forms a ring stain. We have focused on the dynamics of the droplet with/without suspended particles spreading on the solid substrate and on the behaviors of particles in the evaporating droplet. Spreading process of the droplet is significantly affected by the suspended particles. We indicate flow patterns in the droplet, in which the flow exhibits a modal structure with a mode number in the azimuthal direction, and indicate particles depositions after the dryout of the droplet. Three-dimensional particle tracking velocimetry is applied to reconstruct such unique flow patterns in the spreading process of the droplet. Resultant patterns of the particles depositing on the substrate are introduced.

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Acknowledgments

We gratefully acknowledge Prof. Koichi Nishino (Yokohama National University), Assistant Prof. Masahiro Motosuke (Tokyo University of Science), and Mr. Kazunori Kochiya for their invaluable cooperation in carrying out 3D-PTV experiments.

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Authors and Affiliations

  1. Division of Mechanical Engineering, Graduate School of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, Japan

    Koji Yoshitsugu

  2. Department of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, Japan

    Ichiro Ueno

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  1. Koji Yoshitsugu
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  2. Ichiro Ueno
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Correspondence to Ichiro Ueno.

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Yoshitsugu, K., Ueno, I. Effect of suspended particles on spreading of volatile droplet on solid substrate. J Vis 14, 285–294 (2011). https://doi.org/10.1007/s12650-011-0093-y

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  • DOI: https://doi.org/10.1007/s12650-011-0093-y

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