Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 18, Pages 6857-6861Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1120775109
Keywords
emulsions; fluid singularity
Categories
Funding
- National Science Foundation (NSF) [DMR-1105145]
- University of Chicago NSF Materials Research Science and Engineering Centers [DMR-0820054]
- NSF Engineering Research Center for Structured Organic Particulate Systems [EEC-0540855]
- US Department of Energy
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1105145] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [820054] Funding Source: National Science Foundation
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Drop coalescence is central to diverse processes involving dispersions of drops in industrial, engineering, and scientific realms. During coalescence, two drops first touch and then merge as the liquid neck connecting them grows from initially microscopic scales to a size comparable to the drop diameters. The curvature of the interface is infinite at the point where the drops first make contact, and the flows that ensue as the two drops coalesce are intimately coupled to this singularity in the dynamics. Conventionally, this process has been thought to have just two dynamical regimes: a viscous and an inertial regime with a cross-over region between them. We use experiments and simulations to reveal that a third regime, one that describes the initial dynamics of coalescence for all drop viscosities, has been missed. An argument based on force balance allows the construction of a new coalescence phase diagram.
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