Coalescing Clusters Unveil New Regimes of Frictional Fluid Mechanics

TL;DR

This paper uncovers a new class of droplet coalescence governed by high environmental dissipation, revealing novel scaling laws and shape evolution patterns through combined computational and theoretical approaches.

Contribution

It introduces a new theoretical framework for highly dissipative coalescence processes, expanding understanding beyond classical models.

Findings

New scaling laws for droplet coalescence under high dissipation

Identification of shape invariants during coalescence

Mapping of coalescence dynamics to Darcy flow equations

Abstract

Droplet coalescence is essential in a host of biological and industrial processes, involving complex systems as diverse as cellular aggregates, colloidal suspensions, and polymeric liquids. Classical solutions for the time evolution of coalescing clusters are typically based on tractable limiting physics, such as analytical solutions to the Stokes equation. By combining computational and theoretical analyses, we show that there is an unexplored family of coalescence processes: those governed by highly dissipative coupling to the environment. This leads to new scaling laws characterizing droplet coalescence, as well as new time-invariant parameterizations of the shape evolution of the coalescing system. We demonstrate these effects via particle-based simulations and both continuum and boundary-integral solutions to hydrodynamic equations, which we then understand in the context of a generalized Navier-Stokes-like equation. Our theoretical description of highly frictional coalescence mathematically maps onto Darcy flow in the presence of surface tension effects, opening up exciting avenues of research in applying well-studied fluid dynamical techniques to a broad range of novel systems.