Coalescence


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coalescence

[‚kō·ə′les·əns]
(botany)
The union of plant parts of the same kind such as the united sepals of flowering plants.
(metallurgy)
The bonding of welded materials into one body.
(meteorology)
In cloud physics, merging of two or more water drops into a single larger drop.
(physics)
The uniting by growth in one body, as particles, gas, or a liquid.

Coalescence

 

the fusion of drops or bubbles upon contact with each other in a mobile medium (liquid or gas) or on the surface of a body. It is accompanied by enlargement of drops (bubbles) and is brought about by the effect of forces of inter-molecular attraction. It is a spontaneous process accompanied by a decrease in the free energy of the system. As a result of coalescence, emulsions and foams may cease to exist as disperse systems and undergo complete separation into two macrophases, liquid-liquid or liquid-gas. In a liquid dispersion medium, coagulation frequently precedes coalescence. A special case of coalescence is known as self-adhesion, during which the interface between the agglutinating particles or fused lumps of the plastic polymer disappears as a result of slow diffusion of macromolecules.

Along with isothermal distillation, coalescence of water droplets causes the precipitation of atmospheric residue (rain or dew) from clouds and fog. The coalescence of droplets of paint or lacquer sprayed onto a surface to be painted leads to the formation of a continuous film. Coalescence is the basis of many other production processes and natural phenomena.

coalescence

The formation of a film of resinous or polymeric material when water evaporates from an emulsion or latex system, permitting contact and fusion of adjacent latex particles.
References in periodicals archive ?
Although mass ordering is a theoretical expectation from the hydrodynamical approach to heavy-ion collisions [76], coalescence formalism for light nuclei can also give rise to this effect.
Holl, "Small-angle neutron scattering study of particle coalescence and SDS desorption during film formation from carboxylated acrylic latices," Journal of Colloid and Interface Science, vol.
Rousseau, Flocculation and Coalescence in Water-in- Oil Emulsion Stabilized by Paraffin Wax Crystals, Food Res.
3-5 show that interfacial adsorption of particles is an effective means of preventing foam collapse due to cell coalescence. Yet, it raises questions about the mechanism by which the particles reach the surface of the bubbles to such a high coverage.
As a result, one can use the coalescence procedure which, as noted above, reduces the number of operations needed to obtain the solution without affecting the number of operations needed to reprocess probabilities.
As said previously, the MFFT data can only predict that the particles within the films are at least deformed but it can not predict the level of coalescence of those particles.
Subsequently, droplets grew through coalescence and Figure 3 shows the beginning of the coalescence stage; small droplets across the surface are beginning to coalesce.
Thereafter, there have been many attempts on experimental, theoretical, and numerical sides to elucidate the underlying physics governing the dynamics of coalescence.
The groundwater alters the stress state of the flawed rock mass and reduces the effective stress on the structural surface, leading to the crack propagation and coalescence. The crack development, in return, makes the groundwater effect increasingly dynamic.
They are all spiralling together towards coalescence. The time setting depends on their proximity.