EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

A breakup of a droplet falling into a miscible solution

Michiko shimokawa1 and Hidetsugu Sakaguchi2
Michiko shimokawa and Hidetsugu Sakaguchi
  • 1Fukuoka Institute of Technology, Faculty of Engineering, Intelligent Mechanical Engineering, Japan (
  • 2Kyushu University,Faculty of Engineering Sciences,Department of Advanced Energy Science and Engineering

When a droplet with a relatively high density falls into a miscible solution with a relatively low density, the droplet breaks up spontaneously. We investigated the number m of breakup in experiments with several density differences Δρ between two solutions, viscosities μ, and droplet radii r. The mode number m has a distribution even under the same experimental conditions. We propose a simple model of mode selection based on the linear Rayleigh-Taylor instability and the growing radius of a vortex ring deformed from the droplet. The model provides the probability distribution P(m) and a relationship between the nondimensional parameter G ∝ Δρgr32 and the average value of m, which are consistent with experimental results.

How to cite: shimokawa, M. and Sakaguchi, H.: A breakup of a droplet falling into a miscible solution, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-1912,, 2020


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