Damköhler numbers

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What Wikipedia says

The Damköhler numbers (Da) are dimensionless numbers that relate the chemical reaction timescale (reaction rate) to the transport phenomena rate occurring in a system. It is named after German chemist Gerhard Damköhler, who worked in chemical engineering, thermodynamics, and fluid dynamics.

Excerpt from the Wikipedia article “Damköhler numbers”, under the CC BY-SA 4.0 license. Read the article on Wikipedia