Van Deemter
Eddy diffusion (A)
Longitudinal diffusion coefficient (B) [m^2^ s^-1^]
Resistance to mass transfer (C) [s]
$$\text{The Van Deemter equation: }H=A+\frac{B}{U}+(C_s+C_m)u$$
$$\text{The optimum linear speed is calculated as: }u=\sqrt{\frac{B}{C}}$$