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 fluid applicator delivers liquid to the atomizing tip and directs airflow to shape and add momentum to the ultrasonically produced spray.
For example, a beverage bottle maker in Texas uses Spraying Systems' 1/8JJAU air atomizing nozzles.
For Rotary Burners) Check the atomizing cup and air nozzle daily.
This air serves as the carrier for the amine catalyst, either as atomizing air in the case of conventional air spray and air-atomized electrostatic spray, or as assist-air in the case of air-assisted airless spray.
Air-assisted airless systems may have to have their spray caps modified to increase the amount of atomizing air available to ensure sufficient catalytic air is available for curing.
DUX Pressure Feed - Typically used in industrial environments where large quantities of coatings are sprayed throughout the day, this product receives both atomizing air and fluid through the base of the gun for better balance and ease of use.
makes spray nozzles for tablet and fluidized bed coating, 1- and 2-fluid spray drying, tank washing, gas conditioning, sanitation, washing, cleaning, atomizing, dispersing, humidifying, heating and cooling.
One such innovation, which will soon be available for commercial and residential application, is a mini-burner using the "Babington air atomizing principle.
The Tornado Generator device utilizes compressed air to accelerate air to supersonic speeds in a cyclonic chamber which is capable of atomizing virtually anything into a fine micron sized powder nearly instantly.
Since then, air atomizing burners and newer, more efficient boilers have been developed which can effect anywhere from a 20 percent to 30 percent reduction in fuel costs once installed.
The Vapex Hydroxyl Ion fog generator uses a patented air atomizing nozzle to efficiently create a hydroxyl ion fog that eliminates noxious odors and reduces H2S levels.
Keywords in this release: North America, humidity control systems, steam humidifiers, atomizing humidifiers, refrigerant-based dehumidifiers, desiccant-based dehumidifiers, IAQ, ASHRAE, HVAC systems, commercial construction industry, enforcement, regulations, research, information, trends, technology, service, forecast, market share