# 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.
$Da \equiv \frac{\tau_t}{\tau_c}$
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.