Entrainment (engineering)

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Entrainment as commonly used in various branches of science and engineering may be defined as the entrapment of one substance by another substance.^{[1][2][3][4][5]}

Types of entrainment[edit]

There are a great many types of entrainment encountered in chemistry, chemical engineering, other engineering disciplines and in atmospheric sciences. Here are a number of examples:

• The entrapment of liquid droplets in air or any other gas as in aerosols or fog or spray painting.
• The entrapment of liquid droplets and solid particulate matter in a flowing gas, as in smoke entrapped in combustion flue gases.
• The entrapment of gas bubbles or solid particulates in a flowing liquid, as with aeration.
• Given two mutually insoluble liquids, the emulsion of droplets of one liquid entrapped in the other liquid, as with margarine.
• Given two gases, the entrapment of one gas into the other gas.
• The intentional entrapment of air bubbles in concrete.
• The entrapment of solid particles in an air or other gas as in fluid catalytic cracking, fluidized combustion and many other processes utilizing fluidized solids.

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