Table 1.

Modification of $Da$

Current approach	Proposed alternative (this work)
The Damköhler number is defined as a property of the reactor at the inlet.	The Damköhler number is defined as a local property$Da\left(x,y,z,t\right).$
$Da={-R_A}^0{\tau }_R/{C_A}^0$	$Da=-R_A{\tau }_R/{C_A}^0$
It is incorporated into the reaction rate	It is incorporated into the continuity equation
$-R_A=f\left(Da\right)$	$\frac{\partial {\mathit{C}}_{\mathit{A}}}{\partial \mathit{t}}=-\frac{\partial {\mathit{C}}_{\mathit{A}}}{\partial \mathit{z}}-Da$
Dimensional expression.	Dimensionless expression.