atomization

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atomization

[‚ad·ə·mə′zā·shən]
(analytical chemistry)
In flame spectrometry, conversion of a volatilized sample into free atoms.
(chemistry)
A process in which the chemical bonds in a molecule are broken to yield separated (free) atoms.
(mechanical engineering)
The mechanical subdivision of a bulk liquid or meltable solid, such as certain metals, to produce drops, which vary in diameter depending on the process from under 10 to over 1000 micrometers.

Atomization

The process whereby a bulk liquid is transformed into a multiplicity of small drops. This transformation, often called primary atomization, proceeds through the formation of disturbances on the surface of the bulk liquid, followed by their amplification due to energy and momentum transfer from the surrounding gas.

Spray formation processes are critical to the performance of a number of technologies and applications. These include combustion systems (gas turbine engines, internal combustion engines, incinerators, furnaces, rocket motors), agriculture (pesticide and fertilizer treatments), paints and coatings (furniture, automobiles), consumer products (cleaners, personal care products), fire suppression systems, spray cooling (materials processing, computer chip cooling), medicinal (pharmaceutical), and spray drying (foods, drugs, materials processing). Current concerns include how to make smaller drops (especially for internal combustion engines), how to make larger drops (agricultural sprays), how to reduce the number of largest and smallest drops (paints and coatings, consumer products, medicinals, spray drying), how to distribute the liquid mass more uniformly throughout the spray, and how to increase the fraction of liquid that impacts a target (paints and coatings, spray cooling, fire suppression).

Spray devices (that is, atomizers) are often characterized by how disturbances form. The most general distinction is between systems where one or two fluids flow through the atomizer. The most common types of single‐fluid atomizers are pressure (also called plain‐orifice, hydraulic, or pneumatic), pressure‐swirl, rotary, ultrasonic (sometimes termed whistle or acoustic), and electrostatic. Twin‐fluid atomizers include internal‐mix and external‐mix versions, where these terms describe the location where atomizing fluid (almost always a gas) first contacts fluid to be sprayed (almost always a liquid).

While primary atomization is important, because of its role in determining mean drop size and the spectrum of drop sizes, subsequent processes also play key roles in spray behavior. They include further drop breakup (termed secondary atomization), drop transport to and impact on a target, drop evaporation (and perhaps combustion), plus drop collisions and coalescence. In addition, the spray interacts with its surroundings, being modified by the adjacent gas flow and modifying it in turn. See Particulates

atomization

The formation of tiny droplets or a very fine spray, as produced by impinging jets of air on a small stream of paint in spray painting.
References in periodicals archive ?
The spray forming head is a stepped block fabricated from titanium that concentrates the mechanical energy produced by the convertor at the atomizing tip.
2 Atomizing Air Housing, Atomizing Air Tune And Atomizing Air Nozzle For Burner Model 62-4 And Diffuser.
It's built with an atomizing device with two nebulizer jars inside the steam shower sauna room.
The misting head is supplied standard with 9 atomizing nozzles and mounted on a 15-foot boom, but the design was engineered for its ability to be customized for specific dust types, particle behaviors or operating environments.
The powerful misting head is supplied standard with nine atomizing nozzles and mounted on a 15-ft.
The new atomizing spray nozzles from Lee Products generate a precise 50[degrees] hollow cone spray pattern to ensure controlled atomization in a very compact package.
The MediCoat DES 2000 incorporates Sono-Tek's MicroMist ultrasonic atomizing nozzle, and provides stent motion that assures a complete, uniform and accurate micronic layer coating in a validated process.
The ViscoMist air atomizing spray nozzle has been redesigned to provide a cleaner look, improved performance, and increased spray flexibility.
020 spray tip and atomizing air pressure of 30-35 psi.
This reportedly offers a better balance between atomizing air and fan air.