In combustion, the Karlovitz number is defined as the ratio of chemical time scale  to Kolmogorov time scale , named after Béla Karlovitz. The number reads as
In premixed turbulent combustion, the chemical time scale can be defined as , where  is the thermal diffusivity and  is the laminar flame speed and the flame thickness is given by , in which case,
where  is the Kolmogorov scale. The Karlovitz number is related to Damköhler number as
if the Damköhler number is defined with Kolmogorov scale. If , the premixed turbulent flame falls into the category of corrugated flamelets and wrinkled flamelets, otherwise into the thin reaction zone or broken reaction zone flames.