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Coalescence is the process by which two different fluid droplets join to form one larger droplet (or one larger droplet and one smaller droplet, in the case of partial coalescence). The dynamics of this process has been studied using a variety of means, including optical microscopy, ultra-fast x-ray phase imaging, resistance measurements, and confocal microscopy of colloids; these investigations have revealed interesting scaling behavior in the dynamics of fluid droplet coalescence.

Coalescence is often undesirable (for example, in emulsions and foams). A good deal of work focuses on controlling this process: this can be by preventing direct contact between the two droplet interfaces using adsorbed species at the droplet-external fluid interface (such as particles or surfactants), or by using charge.


  • Dirk G. A. L. Aarts, Henk N. W. Lekkerkerker, Hua Guo, Gerard H. Wegdam, and Daniel Bonn, "Hydrodynamics of Droplet Coalescence", Phys. Rev. Lett. 95, 164503 (2005).
  • Kamel Fezzaa and Yujie Wang, "Ultrafast X-Ray Phase-Contrast Imaging of the Initial Coalescence Phase of Two Water Droplets", Phys. Rev. Lett. 100, 104501 (2008).
  • Sarah C. Case and Sidney R. Nagel, "Coalescence in Low-Viscosity Liquids", Phys. Rev. Lett. 100, 084503 (2008).
  • J. Bibette, D. C. Morse, T. A. Witten, and D. A. Weitz, "Stability Criteria for Emulsions", Phys. Rev. Lett. 69, 2439 (1992).
  • W. D. Ristenpart, J. C. Bird, A. Belmonte, F. Dollar and H. A. Stone, "Non-coalescence of oppositely charged drops", Nature 461, 377 (2009).