Entrainment (engineering)

In engineering, entrainment is the entrapment of one substance by another substance.^[1] For example:

• The entrapment of liquid droplets or solid particulates in a flowing gas, as with smoke.
• 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 into the other liquid, as with margarine.
• Given two gases, the entrapment of one gas into the other gas.
• "Air entrainment" – The intentional entrapment of air bubbles into concrete.
• Entrainment defect in metallurgy, as a result of folded pockets of oxide inside the melt.

• Souders–Brown equation

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