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 ?
The final cell density in the foam depends on the intensity of coalescence of bubbles in the die.
CryoSEM images of drying coatings containing silica aggregates (4 wt% dwb) show that silica does not influence the particle coalescence or the evaporation rate in any way.
The following section analyses vowel coalescence as one of the phonological processes that are used to remove vowel sequences in Nambya.
Zheng said that it has been assumed that coalescence events would result in some crystals being much larger than others, a bad thing in that the physical properties of nanocrystals are so dependent upon size and shape that for many applications it is critical that monodispersed nanocrystals be produced during synthesis.
Spielman and Levenspiel (1965) were the first to employ an MC approach to study the effect of particle coalescence in a two-phase particulate reactive system in well-mixed reactors.
Usually, it is assumed in the continuous growth equation by coalescence, that mass and terminal velocity of the collected drops are negligible in comparison with the mass and velocity of the collector drop.
A number of enabling conditions encouraged this coalescence of dissent.
Vignette," Niamh O'Malley's first solo exhibition in a Dublin gallery, was based on a coalescence of the traditional concerns and effects of painting and cinema, a merging of domains that has informed much contemporary art but which was here rendered literal rather than notional.
The name change reflects a coalescence of work at NLC that has a similar purpose and function--identifying the challenges facing cities currently and in the future, and helping cities seize opportunities to address those challenges.
In contrast, MDMs treated with C/Fe particulates exhibited coalescence of particulate-containing lysosomes.
Chest radiograph showed coalescence of nodular shadows and almost complete white-out of bilateral lung fields (Figure, panel B).
On the phonological level, the language presents an interesting case of infix allomorphy and vowel coalescence.