Coalescence (chemistry)

Coalescence refers generally to the coalescence of colloidal particles, e.g. emulsion droplets. These must meet and merge. The surface of the formed " droplet " is now smaller than the sum of the individual droplets, so there is a reduction in the surface instead. The reduction of the surface results in lower frictional resistance of the droplet, so that this consequently rises and falls more rapidly than without coalescence.

Coalescence (also called " Cold River " ) refers to the drying time. At low temperatures and / or high humidity, there is the possibility that the drying of an organically bound plaster is delayed. Organically bound plasters dry physically, that is, that the dispersion in the water flow together slowly as binders in the evaporation of the water and stick together. This process is also referred to as a film formation, and introduced through the water supply to the air until it reaches the equilibrium moisture content and / or in a porous structure.

Coalescence in the genealogy refers to the merging of the branches of a family tree.

Coalescence

With a light liquid or an oil separator, a coalescence is often installed. This stage consists of the V-shaped plates which are arranged one above the other, such as roofs. Through holes at the bending edge of the sheets distributed in the water flowing smallest oil droplets to large oil droplets with more lift together ( the oil droplets accumulate ) and can thus be separated by the difference in density at the surface. This can also be deposited the last 3 % light liquid because you can only achieve an efficiency of 97 % without an adsorption - coalescence.

Coalescing

In a coalescing filter, air ( or liquid ) is passed through a very permeable fiber or wire mesh packing, with oil and dirt particles " random" incident on the filter fibers and stuck due to adhesion ( stickiness ). Secluded sticky substances such as oil can not sticky dirt field. Examples: the old air filter of car and motorcycle engines with oiled wire fabric inserts ( metal mesh ); Oil mist separator ( demister ) in exhaust systems of cutting machines with cooling lubricants; the separation is often not satisfactory, and therefore in non- sticky fine dust filter fundamentally different principle ( filter surface as the typical cartridge filters with Abreinung ) are pore filter, electrostatic filter ( in case of smoke, etc.) or used downstream.

  • Physical chemistry
  • Fluid Mechanics
  • Process engineering
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