منابع مشابه
Inviscid coalescence of drops
We study the coalescence of two drops of an ideal fluid driven by surface tension. The velocity of approach is taken to be zero and the dynamical effect of the outer fluid (usually air) is neglected. Our approximation is expected to be valid on scales larger than ℓ ν = ρν 2 /σ, which is 10nm for water. Using a high-precision boundary integral method, we show that the walls of the thin retractin...
متن کاملCoalescence of Liquid Drops
When two drops of radius R touch, surface tension drives an initially singular motion which joins them into a bigger drop with smaller surface area. This motion is always viscously dominated at early times. We focus on the early-time behavior of the radius rm of the small bridge between the two drops. The flow is driven by a highly curved meniscus of length 2πrm and width ∆ ≪ rm around the brid...
متن کاملSimulations of coulombic fission of charged inviscid drops.
We present boundary-integral simulations of the evolution of critically charged droplets. For such droplets, small perturbations are unstable and eventually lead to the formation of a lemon-shaped drop with very sharp tips. For perfectly conducting drops, the tip forms a self-similar cone shape with a subtended angle identical to that of a Taylor cone, and quantities such as pressure and veloci...
متن کاملHindered and accelerated coalescence of drops in Stokes flow
We analyze axisymmetric near-contact motion of two drops under the action of an external force or imposed flow. It is shown that the far-field stress generated in the near-contact region by the outer flow qualitatively affects drainage of the thin fluid film separating the drops. If this stress acts radially outward, exponential film drainage occurs. For a radially inward far-field stress, film...
متن کاملGravity driven current during the coalescence of two sessile drops
Coalescence of liquid drops is critical in many phenomena such as emulsion stability, inkjet printing, and coating applications. For sessile drops on a solid surface, the coalescence process is more complicated than the coalescence of drops suspended in a fluid medium as a result of the coupling of the contact line motions to the fluid flow. In this paper, we use video microscopy to track the e...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2003
ISSN: 0022-1120,1469-7645
DOI: 10.1017/s0022112003004646