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Damkohler number

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The Damkohler number is used in turbulent combustion and corresponds to the ratio of chemical time scale  \tau_c and turbulent time scale  \tau_t . This turbulent scale is usually taken as the integral scale.

Da \equiv \frac{\tau_t}{\tau_c}

Damkohler number measures how important is the interaction between chemistry and turbulence. Most combustion models are placed in the extremes of Damkohler.

If  Da << 1 the turbulence is much faster than the chemistry. This regime is the "well-stirred reactor", where products and reactants are rapidly mixed. The Karlovitz number is linked to the Damkholer number.

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