What is it about?

Our investigation tells that, during coalescence, flow in the bulk drops is inertial, the dominant resistance occurs through a viscous effect in the merging interface region and at the lesser extent in the bridge region. Early dynamics of drop coalescence is dominated by the Ohnesorge number (Oh), and later dynamics are dependent on how drops are bounded.

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Why is it important?

Drop coalescence are ubiquitous in nature and in industry. Theoretical understanding of coalescence may help in creating patterning, in mixing, in 3D printing, in sintering, in material processing, in cell biology. It can also help to understand the kinetics of any multi-phase flow system where liquid merging occurs.

Perspectives

Here we validated our theoretical understanding through scaling law formulation and by comparing them for a range of viscous fluids in experiments. In the study, we made several useful assumptions that helped to look at this complex problem much easier way.

Md Mahmudur Rahman
University of Louisville

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This page is a summary of: Viscous resistance in drop coalescence, Physics of Fluids, January 2019, American Institute of Physics, DOI: 10.1063/1.5064706.
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